diff --git a/docs/apis/AppRegistry.md b/docs/apis/AppRegistry.md
new file mode 100644
index 00000000..c824a3fb
--- /dev/null
+++ b/docs/apis/AppRegistry.md
@@ -0,0 +1,60 @@
+# AppRegistry
+
+`AppRegistry` is the control point for registering, running, prerendering, and
+unmounting all apps. App root components should register themselves with
+`AppRegistry.registerComponent`. Apps can be run by invoking
+`AppRegistry.runApplication`, and prerendered by invoking
+`AppRegistry.prerenderApplication` (see the [client and server rendering
+guide](../guides/rendering.md) for more details).
+
+To "stop" an application when a view should be destroyed, call
+`AppRegistry.unmountApplicationComponentAtRootTag` with the tag that was passed
+into `runApplication`. These should always be used as a pair.
+
+## Methods
+
+(web) static **prerenderApplication**(appKey:string, appParameters: object)
+
+Renders the given application to an HTML string. Use this for server-side
+rendering. Return object is of type `{ html: string; style: string; }`, where
+`html` the prerendered HTML, and `style` is the prerendered style sheet.
+
+static **registerConfig**(config: Array<AppConfig>)
+
+Registry multiple applications. `AppConfig` is of type `{ appKey: string;
+component: ComponentProvider; run?: Function }`.
+
+static **registerComponent**(appKey: string, getComponentFunc: ComponentProvider)
+
+Register a component provider under the given `appKey`.
+
+static **registerRunnable**(appKey: string, run: Function)
+
+Register a custom render function for an application. The function will receive
+the `appParameters` passed to `runApplication`.
+
+static **getAppKeys**()
+
+Returns all registered app keys.
+
+static **runApplication**(appKey: string, appParameters?: object)
+
+Runs the application that was registered under `appKey`. The `appParameters`
+must include the `rootTag` into which the application is rendered, and
+optionally any `initialProps`.
+
+static **unmountApplicationComponentAtRootTag**(rootTag: HTMLElement)
+
+To "stop" an application when a view should be destroyed, call
+`AppRegistry.unmountApplicationComponentAtRootTag` with the tag that was passed
+into `runApplication`
+
+## Example
+
+```
+AppRegistry.registerComponent('MyApp', () => AppComponent)
+AppRegistry.runApplication('MyApp', {
+  initialProps: {},
+  rootTag: document.getElementById('react-root')
+})
+```
diff --git a/docs/apis/AppState.md b/docs/apis/AppState.md
new file mode 100644
index 00000000..7d26b213
--- /dev/null
+++ b/docs/apis/AppState.md
@@ -0,0 +1,61 @@
+## AppState
+
+`AppState` can tell you if the app is in the foreground or background, and
+notify you when the state changes.
+
+States
+
+* `active` - The app is running in the foreground
+* `background` - The app is running in the background (i.e., the user has not focused the app's tab).
+
+## Properties
+
+static **currentState**
+
+Returns the current state of the app: `active` or `background`.
+
+## Methods
+
+static **addEventListener**(type: string, handler: Function)
+
+Add a handler to `AppState` changes by listening to the `change` event type and
+providing the `handler`. The handler is called with the app state value.
+
+static **removeEventListener**(type: string, handler: Function)
+
+Remove a handler by passing the change event `type` and the `handler`.
+
+## Examples
+
+To see the current state, you can check `AppStateIOS.currentState`, which will
+be kept up-to-date. This example will only ever appear to say "Current state
+is: active" because the app is only visible to the user when in the `active`
+state, and the null state will happen only momentarily.
+
+```js
+class Example extends React.Component {
+  constructor(props) {
+    super(props)
+    this.state = { currentAppState: AppState.currentState }
+    this._handleAppStateChange = this._handleAppStateChange.bind(this)
+  }
+
+  componentDidMount() {
+    AppState.addEventListener('change', this._handleAppStateChange);
+  }
+
+  componentWillUnmount() {
+    AppState.removeEventListener('change', this._handleAppStateChange);
+  }
+
+  _handleAppStateChange(currentAppState) {
+    this.setState({ currentAppState });
+  }
+
+  render() {
+    return (
+      <Text>Current state is: {this.state.currentAppState}</Text>
+    )
+  }
+}
+```
diff --git a/docs/apis/AsyncStorage.md b/docs/apis/AsyncStorage.md
new file mode 100644
index 00000000..6c83b3cf
--- /dev/null
+++ b/docs/apis/AsyncStorage.md
@@ -0,0 +1,71 @@
+# AsyncStorage
+
+`AsyncStorage` is a simple, asynchronous, persistent, key-value storage system
+that is global to the domain. It's a facade over, and should be used instead of
+`window.localStorage` to provide an asynchronous API and multi functions. Each
+method returns a `Promise` object.
+
+It is recommended that you use an abstraction on top of `AsyncStorage` instead
+of `AsyncStorage` directly for anything more than light usage since it operates
+globally.
+
+The batched functions are useful for executing a lot of operations at once,
+allowing for optimizations to provide the convenience of a single promise after
+all operations are complete.
+
+## Methods
+
+static **clear**()
+
+Erases all AsyncStorage. You probably don't want to call this - use
+`removeItem` or `multiRemove` to clear only your own keys instead. Returns a
+Promise object.
+
+static **getAllKeys**()
+
+Gets all known keys. Returns a Promise object.
+
+static **getItem**(key: string)
+
+Fetches the value of the given key. Returns a Promise object.
+
+static **mergeItem**(key: string, value: string)
+
+Merges existing value with input value, assuming they are stringified JSON.
+Returns a Promise object.
+
+static **multiGet**(keys: Array<string>)
+
+`multiGet` results in an array of key-value pair arrays that matches the input
+format of `multiSet`. Returns a Promise object.
+
+```js
+multiGet(['k1', 'k2']) -> [['k1', 'val1'], ['k2', 'val2']]
+```
+
+static **multiMerge**(keyValuePairs: Array<Array<string>>)
+
+multiMerge takes an array of key-value array pairs that match the output of
+`multiGet`. It merges existing values with input values, assuming they are
+stringified JSON. Returns a Promise object.
+
+static **multiRemove**(keys: Array<string>)
+
+Delete all the keys in the keys array. Returns a Promise object.
+
+static **multiSet**(keyValuePairs: Array<Array<string>>)
+
+`multiSet` takes an array of key-value array pairs that match the output of
+`multiGet`. Returns a Promise object.
+
+```js
+multiSet([['k1', 'val1'], ['k2', 'val2']]);
+```
+
+static **removeItem**(key: string)
+
+Removes the value of the given key. Returns a Promise object.
+
+static **setItem**(key: string, value: string)
+
+Sets the value of the given key. Returns a Promise object.
diff --git a/docs/apis/Dimensions.md b/docs/apis/Dimensions.md
new file mode 100644
index 00000000..20a7b09f
--- /dev/null
+++ b/docs/apis/Dimensions.md
@@ -0,0 +1,13 @@
+# Dimensions
+
+Note: dimensions may change (e.g due to device rotation) so any rendering logic
+or styles that depend on these constants should try to call this function on
+every render, rather than caching the value.
+
+## Methods
+
+static **get**(dimension: string)
+
+Get a dimension (e.g., `"window"` or `"screen"`).
+
+Example: `const { height, width } = Dimensions.get('window')`
diff --git a/docs/apis/NativeMethods.md b/docs/apis/NativeMethods.md
new file mode 100644
index 00000000..b878c85f
--- /dev/null
+++ b/docs/apis/NativeMethods.md
@@ -0,0 +1,42 @@
+# NativeMethods
+
+React Native for Web provides several methods to directly access the underlying
+DOM node. This can be useful in cases when you want to focus a view or measure
+its on-screen dimensions, for example.
+
+The methods described are available on most of the default components provided
+by React Native for Web. Note, however, that they are *not* available on the
+composite components that you define in your own app. For more information, see
+[Direct Manipulation](../guides/direct-manipulation.md).
+
+## Methods
+
+**blur**()
+
+Removes focus from an input or view. This is the opposite of `focus()`.
+
+**focus**()
+
+Requests focus for the given input or view. The exact behavior triggered will
+depend the type of view.
+
+**measure**(callback: (x, y, width, height, pageX, pageY) => void)
+
+For a given view, `measure` determines the offset relative to the parent view,
+width, height, and the offset relative to the viewport. Returns the values via
+an async callback.
+
+Note that these measurements are not available until after the rendering has
+been completed.
+
+**measureLayout**(relativeToNativeNode: DOMNode, onSuccess: (x, y, width, height) => void)
+
+Like `measure`, but measures the view relative to another view, specified as
+`relativeToNativeNode`. This means that the returned `x`, `y` are relative to
+the origin `x`, `y` of the ancestor view.
+
+**setNativeProps**(nativeProps: Object)
+
+This function sends props straight to the underlying DOM node. See the [direct
+manipulation](../guides/direct-manipulation.md) guide for cases where
+`setNativeProps` should be used.
diff --git a/docs/apis/NetInfo.md b/docs/apis/NetInfo.md
new file mode 100644
index 00000000..c379200f
--- /dev/null
+++ b/docs/apis/NetInfo.md
@@ -0,0 +1,77 @@
+# NetInfo
+
+`NetInfo` asynchronously determines the online/offline status of the
+application.
+
+Connection types:
+
+* `bluetooth` - The user agent is using a Bluetooth connection.
+* `cellular` - The user agent is using a cellular connection (e.g., EDGE, HSPA, LTE, etc.).
+* `ethernet` - The user agent is using an Ethernet connection.
+* `mixed` -  The user agent is using multiple connection types.
+* `none` - The user agent will not contact the network (offline).
+* `other` - The user agent is using a connection type that is not one of enumerated connection types.
+* `unknown` -  The user agent has established a network connection, but is unable to determine what is the underlying connection technology.
+* `wifi` - The user agent is using a Wi-Fi connection.
+* `wimax` -  The user agent is using a WiMAX connection.
+
+## Methods
+
+Note that support for retrieving the connection type depends upon browswer
+support (and is limited to mobile browsers). It will default to `unknown` when
+support is missing.
+
+static **addEventListener**(eventName: ChangeEventName, handler: Function)
+
+static **fetch**(): Promise
+
+static **removeEventListener**(eventName: ChangeEventName, handler: Function)
+
+## Properties
+
+**isConnected**
+
+Available on all user agents. Asynchronously fetch a boolean to determine
+internet connectivity.
+
+**isConnected.addEventListener**(eventName: ChangeEventName, handler: Function)
+
+**isConnected.fetch**(): Promise
+
+**isConnected.removeEventListener**(eventName: ChangeEventName, handler: Function)
+
+## Examples
+
+Fetching the connection type:
+
+```
+NetInfo.fetch().then((connectionType) => {
+  console.log('Connection type:', connectionType);
+});
+```
+
+Subscribing to changes in the connection type:
+
+```js
+const handleConnectivityTypeChange = (connectionType) => {
+  console.log('Current connection type:', connectionType);
+}
+NetInfo.addEventListener('change', handleConnectivityTypeChange);
+```
+
+Fetching the connection status:
+
+```js
+NetInfo.isConnected.fetch().then((isConnected) => {
+  console.log('Connection status:', (isConnected ? 'online' : 'offline'));
+});
+```
+
+Subscribing to changes in the connection status:
+
+```js
+const handleConnectivityStatusChange = (isConnected) => {
+  console.log('Current connection status:', (isConnected ? 'online' : 'offline'));
+}
+NetInfo.isConnected.addEventListener('change', handleConnectivityStatusChange);
+```
diff --git a/docs/apis/PixelRatio.md b/docs/apis/PixelRatio.md
new file mode 100644
index 00000000..0acc3e09
--- /dev/null
+++ b/docs/apis/PixelRatio.md
@@ -0,0 +1,51 @@
+# PixelRatio
+
+`PixelRatio` gives access to the device pixel density.
+
+## Methods
+
+static **get**()
+
+Returns the device pixel density. Some examples:
+
+* PixelRatio.get() === 1
+  * mdpi Android devices (160 dpi)
+* PixelRatio.get() === 1.5
+  * hdpi Android devices (240 dpi)
+* PixelRatio.get() === 2
+  * iPhone 4, 4S
+  * iPhone 5, 5c, 5s
+  * iPhone 6
+  * xhdpi Android devices (320 dpi)
+* PixelRatio.get() === 3
+  * iPhone 6 plus
+  * xxhdpi Android devices (480 dpi)
+* PixelRatio.get() === 3.5
+  * Nexus 6
+
+static **getPixelSizeForLayoutSize**(layoutSize: number)
+
+Converts a layout size (dp) to pixel size (px). Guaranteed to return an integer
+number.
+
+static **roundToNearestPixel**(layoutSize: number)
+
+Rounds a layout size (dp) to the nearest layout size that corresponds to an
+integer number of pixels. For example, on a device with a PixelRatio of 3,
+`PixelRatio.roundToNearestPixel(8.4)` = `8.33`, which corresponds to exactly
+`(8.33 * 3)` = `25` pixels.
+
+## Examples
+
+Fetching a correctly sized image. You should get a higher resolution image if
+you are on a high pixel density device. A good rule of thumb is to multiply the
+size of the image you display by the pixel ratio.
+
+```js
+const image = getImage({
+  width: PixelRatio.getPixelSizeForLayoutSize(200),
+  height: PixelRatio.getPixelSizeForLayoutSize(100),
+});
+
+<Image source={image} style={{ width: 200, height: 100 }} />
+```
diff --git a/docs/apis/Platform.md b/docs/apis/Platform.md
new file mode 100644
index 00000000..25aa3d6c
--- /dev/null
+++ b/docs/apis/Platform.md
@@ -0,0 +1,28 @@
+# Platform
+
+Detect what is the platform in which the app is running. This piece of
+functionality can be useful when only small parts of a component are platform
+specific.
+
+## Properties
+
+**OS**: string
+
+`Platform.OS` will be `web` when running in a Web browser.
+
+**userAgent**: string
+
+On Web, the `Platform` module can be also be used to detect the browser
+`userAgent`.
+
+## Examples
+
+```js
+const styles = StyleSheet.create({
+  height: (Platform.OS === 'web') ? 200 : 100,
+});
+
+if (Platform.userAgent.includes('Android')) {
+  console.log('Running on Android!');
+}
+```
diff --git a/docs/apis/StyleSheet.md b/docs/apis/StyleSheet.md
index 7d1c042f..4cc94d49 100644
--- a/docs/apis/StyleSheet.md
+++ b/docs/apis/StyleSheet.md
@@ -5,7 +5,11 @@ CSS without requiring a compile-time step. Some styles cannot be resolved
 outside of the render loop and are applied as inline styles. Read more about to
 [how style your application](docs/guides/style).
 
-Create a new StyleSheet:
+## Methods
+
+**create**(obj: {[key: string]: any})
+
+## Example
 
 ```js
 const styles = StyleSheet.create({
@@ -36,7 +40,3 @@ Use styles:
   />
 </View>
 ```
-
-## Methods
-
-**create**(obj: {[key: string]: any})
diff --git a/package.json b/package.json
index 0eca56d1..3f85bfc6 100644
--- a/package.json
+++ b/package.json
@@ -12,12 +12,13 @@
     "examples": "webpack-dev-server --config config/webpack.config.example.js --inline --hot --colors --quiet",
     "lint": "eslint config examples src",
     "prepublish": "npm run build && npm run build:umd",
-    "test": "npm run lint && npm run test:unit",
-    "test:unit": "karma start config/karma.config.js",
+    "test": "karma start config/karma.config.js",
     "test:watch": "npm run test:unit -- --no-single-run"
   },
   "dependencies": {
+    "exenv": "^1.2.0",
     "inline-style-prefixer": "^0.5.3",
+    "invariant": "^2.2.0",
     "lodash.debounce": "^3.1.1",
     "react-tappable": "^0.7.1",
     "react-textarea-autosize": "^3.1.0"
@@ -53,8 +54,12 @@
     "webpack": "^1.12.9",
     "webpack-dev-server": "^1.14.0"
   },
+  "peerDependencies": {
+    "react": "^0.14.3",
+    "react-dom": "^0.14.3"
+  },
   "author": "Nicolas Gallagher",
-  "license": "MIT",
+  "license": "BSD-3-Clause",
   "repository": {
     "type": "git",
     "url": "git://github.com/necolas/react-native-web.git"
diff --git a/src/apis/AppRegistry/ReactNativeApp.js b/src/apis/AppRegistry/ReactNativeApp.js
new file mode 100644
index 00000000..c3e1eda4
--- /dev/null
+++ b/src/apis/AppRegistry/ReactNativeApp.js
@@ -0,0 +1,47 @@
+import Portal from '../../components/Portal'
+import React, { Component, PropTypes } from 'react'
+import ReactDOM from 'react-dom'
+import StyleSheet from '../../apis/StyleSheet'
+import View from '../../components/View'
+
+export default class ReactNativeApp extends Component {
+  static propTypes = {
+    initialProps: PropTypes.object,
+    rootComponent: PropTypes.any.isRequired,
+    rootTag: PropTypes.any
+  };
+
+  constructor(props, context) {
+    super(props, context)
+    this._handleModalVisibilityChange = this._handleModalVisibilityChange.bind(this)
+  }
+
+  _handleModalVisibilityChange(modalVisible) {
+    ReactDOM.findDOMNode(this._root).setAttribute('aria-hidden', `${modalVisible}`)
+  }
+
+  render() {
+    const { initialProps, rootComponent: RootComponent, rootTag } = this.props
+
+    return (
+      <View style={styles.appContainer}>
+        <RootComponent {...initialProps} ref={(c) => { this._root = c }} rootTag={rootTag} />
+        <Portal onModalVisibilityChanged={this._handleModalVisibilityChange} />
+      </View>
+    )
+  }
+}
+
+const styles = StyleSheet.create({
+  /**
+   * Ensure that the application covers the whole screen. This prevents the
+   * Portal content from being clipped.
+   */
+  appContainer: {
+    position: 'absolute',
+    left: 0,
+    top: 0,
+    right: 0,
+    bottom: 0
+  }
+})
diff --git a/src/apis/AppRegistry/__tests__/index-test.js b/src/apis/AppRegistry/__tests__/index-test.js
new file mode 100644
index 00000000..e69de29b
diff --git a/src/apis/AppRegistry/__tests__/renderApplication-test.js b/src/apis/AppRegistry/__tests__/renderApplication-test.js
new file mode 100644
index 00000000..e69de29b
diff --git a/src/apis/AppRegistry/index.js b/src/apis/AppRegistry/index.js
new file mode 100644
index 00000000..6ddfc53a
--- /dev/null
+++ b/src/apis/AppRegistry/index.js
@@ -0,0 +1,90 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import { Component } from 'react'
+import invariant from 'invariant'
+import ReactDOM from 'react-dom'
+import renderApplication, { prerenderApplication } from './renderApplication'
+
+const runnables = {}
+
+type ComponentProvider = () => Component<any, any, any>
+
+type AppConfig = {
+  appKey: string;
+  component?: ComponentProvider;
+  run?: Function;
+};
+
+/**
+ * `AppRegistry` is the JS entry point to running all React Native apps.
+ */
+export default class AppRegistry {
+  static getAppKeys(): Array<string> {
+    return Object.keys(runnables)
+  }
+
+  static prerenderApplication(appKey: string, appParameters?: Object): string {
+    invariant(
+      runnables[appKey] && runnables[appKey].prerender,
+      `Application ${appKey} has not been registered. ` +
+      `This is either due to an import error during initialization or failure to call AppRegistry.registerComponent.`
+    )
+
+    return runnables[appKey].prerender(appParameters)
+  }
+
+  static registerComponent(appKey: string, getComponentFunc: ComponentProvider): string {
+    runnables[appKey] = {
+      run: ({ initialProps, rootTag }) => renderApplication(getComponentFunc(), initialProps, rootTag),
+      prerender: ({ initialProps } = {}) => prerenderApplication(getComponentFunc(), initialProps)
+    }
+    return appKey
+  }
+
+  static registerConfig(config: Array<AppConfig>) {
+    config.forEach(({ appKey, component, run }) => {
+      if (run) {
+        AppRegistry.registerRunnable(appKey, run)
+      } else {
+        invariant(component, 'No component provider passed in')
+        AppRegistry.registerComponent(appKey, component)
+      }
+    })
+  }
+
+  // TODO: fix style sheet creation when using this method
+  static registerRunnable(appKey: string, run: Function): string {
+    runnables[appKey] = { run }
+    return appKey
+  }
+
+  static runApplication(appKey: string, appParameters?: Object): void {
+    const isDevelopment = process.env.NODE_ENV === 'development'
+    const params = { ...appParameters }
+    params.rootTag = `#${params.rootTag.id}`
+
+    console.log(
+      `Running application "${appKey}" with appParams: ${JSON.stringify(params)}. ` +
+      `development-level warnings are ${isDevelopment ? 'ON' : 'OFF'}, ` +
+      `performance optimizations are ${isDevelopment ? 'OFF' : 'ON'}`
+    )
+
+    invariant(
+      runnables[appKey] && runnables[appKey].run,
+      `Application "${appKey}" has not been registered. ` +
+      `This is either due to an import error during initialization or failure to call AppRegistry.registerComponent.`
+    )
+
+    runnables[appKey].run(appParameters)
+  }
+
+  static unmountApplicationComponentAtRootTag(rootTag) {
+    ReactDOM.unmountComponentAtNode(rootTag)
+  }
+}
diff --git a/src/apis/AppRegistry/renderApplication.js b/src/apis/AppRegistry/renderApplication.js
new file mode 100644
index 00000000..f82c8286
--- /dev/null
+++ b/src/apis/AppRegistry/renderApplication.js
@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import invariant from 'invariant'
+import React, { Component } from 'react'
+import ReactDOM from 'react-dom'
+import ReactDOMServer from 'react-dom/server'
+import ReactNativeApp from './ReactNativeApp'
+import StyleSheet from '../../apis/StyleSheet'
+
+const STYLESHEET_ID = 'react-stylesheet'
+const renderStyleSheetToString = () => `<style id="${STYLESHEET_ID}">${StyleSheet._renderToString()}</style>`
+
+export default function renderApplication(RootComponent: Component, initialProps: Object, rootTag: any) {
+  invariant(rootTag, 'Expect to have a valid rootTag, instead got ', rootTag)
+
+  // insert style sheet if needed
+  const styleElement = document.getElementById(STYLESHEET_ID)
+  if (!styleElement) { rootTag.insertAdjacentHTML('beforebegin', renderStyleSheetToString()) }
+
+  const component = (
+    <ReactNativeApp
+      initialProps={initialProps}
+      rootComponent={RootComponent}
+      rootTag={rootTag}
+    />
+  )
+  ReactDOM.render(component, rootTag)
+}
+
+export function prerenderApplication(RootComponent: Component, initialProps: Object): string {
+  const component = (
+    <ReactNativeApp
+      initialProps={initialProps}
+      rootComponent={RootComponent}
+    />
+  )
+  const html = ReactDOMServer.renderToString(component)
+  const style = renderStyleSheetToString()
+  return { html, style }
+}
diff --git a/src/apis/AppState/__tests__/index-test.js b/src/apis/AppState/__tests__/index-test.js
new file mode 100644
index 00000000..7870afbf
--- /dev/null
+++ b/src/apis/AppState/__tests__/index-test.js
@@ -0,0 +1,5 @@
+/* eslint-env mocha */
+
+suite('apis/AppState', () => {
+  test.skip('NO TEST COVERAGE', () => {})
+})
diff --git a/src/apis/AppState/index.js b/src/apis/AppState/index.js
new file mode 100644
index 00000000..0810313a
--- /dev/null
+++ b/src/apis/AppState/index.js
@@ -0,0 +1,29 @@
+import invariant from 'invariant'
+
+const listeners = {}
+const eventTypes = [ 'change' ]
+
+export default class AppState {
+  static get currentState() {
+    switch (document.visibilityState) {
+      case 'hidden':
+      case 'prerender':
+      case 'unloaded':
+        return 'background'
+      default:
+        return 'active'
+    }
+  }
+
+  static addEventListener(type: string, handler: Function) {
+    listeners[handler] = () => handler(AppState.currentState)
+    invariant(eventTypes.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type)
+    document.addEventListener('visibilitychange', listeners[handler], false)
+  }
+
+  static removeEventListener(type: string, handler: Function) {
+    invariant(eventTypes.indexOf(type) !== -1, 'Trying to remove listener for unknown event: "%s"', type)
+    document.removeEventListener('visibilitychange', listeners[handler], false)
+    delete listeners[handler]
+  }
+}
diff --git a/src/apis/AsyncStorage/__tests__/index-test.js b/src/apis/AsyncStorage/__tests__/index-test.js
new file mode 100644
index 00000000..000366ce
--- /dev/null
+++ b/src/apis/AsyncStorage/__tests__/index-test.js
@@ -0,0 +1,5 @@
+/* eslint-env mocha */
+
+suite('apis/AsyncStorage', () => {
+  test.skip('NO TEST COVERAGE', () => {})
+})
diff --git a/src/apis/AsyncStorage/index.js b/src/apis/AsyncStorage/index.js
new file mode 100644
index 00000000..c975709a
--- /dev/null
+++ b/src/apis/AsyncStorage/index.js
@@ -0,0 +1,159 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ */
+
+const mergeLocalStorageItem = (key, value) => {
+  const oldValue = window.localStorage.getItem(key)
+  const oldObject = JSON.parse(oldValue)
+  const newObject = JSON.parse(value)
+  const nextValue = JSON.stringify({ ...oldObject, ...newObject })
+  window.localStorage.setItem(key, nextValue)
+}
+
+export default class AsyncStorage {
+  /**
+   * Erases *all* AsyncStorage for the domain.
+   */
+  static clear() {
+    return new Promise((resolve, reject) => {
+      try {
+        window.localStorage.clear()
+        resolve(null)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+
+  /**
+   * Gets *all* keys known to the app, for all callers, libraries, etc.
+   */
+  static getAllKeys() {
+    return new Promise((resolve, reject) => {
+      try {
+        const numberOfKeys = window.localStorage.length
+        const keys = []
+        for (let i = 0; i < numberOfKeys; i += 1) {
+          const key = window.localStorage.key(i)
+          keys.push(key)
+        }
+        resolve(keys)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+
+  /**
+   * Fetches `key` value.
+   */
+  static getItem(key: string) {
+    return new Promise((resolve, reject) => {
+      try {
+        const value = window.localStorage.getItem(key)
+        resolve(value)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+
+  /**
+   * Merges existing value with input value, assuming they are stringified JSON.
+   */
+  static mergeItem(key: string, value: string) {
+    return new Promise((resolve, reject) => {
+      try {
+        mergeLocalStorageItem(key, value)
+        resolve(null)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+
+  /**
+   * multiGet resolves to an array of key-value pair arrays that matches the
+   * input format of multiSet.
+   *
+   *   multiGet(['k1', 'k2']) -> [['k1', 'val1'], ['k2', 'val2']]
+   */
+  static multiGet(keys: Array<string>) {
+    const promises = keys.map((key) => AsyncStorage.getItem(key))
+
+    return Promise.all(promises).then(
+      (result) => Promise.resolve(result.map((value, i) => [ keys[i], value ])),
+      (error) => Promise.reject(error)
+    )
+  }
+
+  /**
+   * Takes an array of key-value array pairs and merges them with existing
+   * values, assuming they are stringified JSON.
+   *
+   *   multiMerge([['k1', 'val1'], ['k2', 'val2']])
+   */
+  static multiMerge(keyValuePairs: Array<Array<string>>) {
+    const promises = keyValuePairs.map((item) => AsyncStorage.mergeItem(item[0], item[1]))
+
+    return Promise.all(promises).then(
+      () => Promise.resolve(null),
+      (error) => Promise.reject(error)
+    )
+  }
+
+  /**
+   * Delete all the keys in the `keys` array.
+   */
+  static multiRemove(keys: Array<string>) {
+    const promises = keys.map((key) => AsyncStorage.removeItem(key))
+
+    return Promise.all(promises).then(
+      () => Promise.resolve(null),
+      (error) => Promise.reject(error)
+    )
+  }
+
+  /**
+   * Takes an array of key-value array pairs.
+   *   multiSet([['k1', 'val1'], ['k2', 'val2']])
+   */
+  static multiSet(keyValuePairs: Array<Array<string>>) {
+    const promises = keyValuePairs.map((item) => AsyncStorage.setItem(item[0], item[1]))
+
+    return Promise.all(promises).then(
+      () => Promise.resolve(null),
+      (error) => Promise.reject(error)
+    )
+  }
+
+  /**
+   * Removes a `key`
+   */
+  static removeItem(key: string) {
+    return new Promise((resolve, reject) => {
+      try {
+        window.localStorage.removeItem(key)
+        resolve(null)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+
+  /**
+   * Sets `value` for `key`.
+   */
+  static setItem(key: string, value: string) {
+    return new Promise((resolve, reject) => {
+      try {
+        window.localStorage.setItem(key, value)
+        resolve(null)
+      } catch (err) {
+        reject(err)
+      }
+    })
+  }
+}
diff --git a/src/apis/Dimensions/__tests__/index-test.js b/src/apis/Dimensions/__tests__/index-test.js
new file mode 100644
index 00000000..56228914
--- /dev/null
+++ b/src/apis/Dimensions/__tests__/index-test.js
@@ -0,0 +1,5 @@
+/* eslint-env mocha */
+
+suite('apis/Dimensions', () => {
+  test.skip('NO TEST COVERAGE', () => {})
+})
diff --git a/src/apis/Dimensions/index.js b/src/apis/Dimensions/index.js
new file mode 100644
index 00000000..f1ea8634
--- /dev/null
+++ b/src/apis/Dimensions/index.js
@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import invariant from 'invariant'
+
+const dimensions = {
+  screen: {
+    fontScale: 1,
+    get height() { return window.screen.height },
+    scale: window.devicePixelRatio || 1,
+    get width() { return window.screen.width }
+  },
+  window: {
+    fontScale: 1,
+    get height() { return document.documentElement.clientHeight },
+    scale: window.devicePixelRatio || 1,
+    get width() { return document.documentElement.clientWidth }
+  }
+}
+
+export default class Dimensions {
+  static get(dimension: string): Object {
+    invariant(dimensions[dimension], 'No dimension set for key ' + dimension)
+    return dimensions[dimension]
+  }
+}
diff --git a/src/apis/NetInfo/__tests__/index-test.js b/src/apis/NetInfo/__tests__/index-test.js
new file mode 100644
index 00000000..958b2724
--- /dev/null
+++ b/src/apis/NetInfo/__tests__/index-test.js
@@ -0,0 +1,5 @@
+/* eslint-env mocha */
+
+suite('apis/NetInfo', () => {
+  test.skip('NO TEST COVERAGE', () => {})
+})
diff --git a/src/apis/NetInfo/index.js b/src/apis/NetInfo/index.js
new file mode 100644
index 00000000..26115423
--- /dev/null
+++ b/src/apis/NetInfo/index.js
@@ -0,0 +1,77 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import invariant from 'invariant'
+
+const connection = window.navigator.connection || window.navigator.mozConnection || window.navigator.webkitConnection
+const eventTypes = [ 'change' ]
+
+/**
+ * Navigator online: https://developer.mozilla.org/en-US/docs/Web/API/NavigatorOnLine/onLine
+ * Network Connection API: https://developer.mozilla.org/en-US/docs/Web/API/NetworkInformation
+ */
+const NetInfo = {
+  addEventListener(type: string, handler: Function): { remove: () => void } {
+    invariant(eventTypes.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type)
+    if (!connection) {
+      console.error('Network Connection API is not supported. Not listening for connection type changes.')
+      return {
+        remove: () => {}
+      }
+    }
+
+    connection.addEventListener(type, handler)
+    return {
+      remove: () => NetInfo.removeEventListener(type, handler)
+    }
+  },
+
+  removeEventListener(type: string, handler: Function): void {
+    invariant(eventTypes.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type)
+    if (!connection) { return }
+    connection.removeEventListener(type, handler)
+  },
+
+  fetch(): Promise {
+    return new Promise((resolve, reject) => {
+      try {
+        resolve(connection.type)
+      } catch (err) {
+        resolve('unknown')
+      }
+    })
+  },
+
+  isConnected: {
+    addEventListener(type: string, handler: Function): { remove: () => void } {
+      invariant(eventTypes.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type)
+      window.addEventListener('online', handler.bind(true), false)
+      window.addEventListener('offline', handler.bind(false), false)
+
+      return {
+        remove: () => NetInfo.isConnected.removeEventListener(type, handler)
+      }
+    },
+
+    removeEventListener(type: string, handler: Function): void {
+      invariant(eventTypes.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type)
+      window.removeEventListener('online', handler.bind(true), false)
+      window.removeEventListener('offline', handler.bind(false), false)
+    },
+
+    fetch(): Promise {
+      return new Promise((resolve, reject) => {
+        try {
+          resolve(window.navigator.onLine)
+        } catch (err) {
+          resolve(true)
+        }
+      })
+    }
+  }
+}
diff --git a/src/apis/PixelRatio/__tests__/index-test.js b/src/apis/PixelRatio/__tests__/index-test.js
new file mode 100644
index 00000000..1b52c460
--- /dev/null
+++ b/src/apis/PixelRatio/__tests__/index-test.js
@@ -0,0 +1,5 @@
+/* eslint-env mocha */
+
+suite('apis/PixelRatio', () => {
+  test.skip('NO TEST COVERAGE', () => {})
+})
diff --git a/src/apis/PixelRatio/index.js b/src/apis/PixelRatio/index.js
new file mode 100644
index 00000000..07770e25
--- /dev/null
+++ b/src/apis/PixelRatio/index.js
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import Dimensions from '../Dimensions'
+
+/**
+ * PixelRatio gives access to the device pixel density.
+ */
+export default class PixelRatio {
+  /**
+   * Returns the device pixel density.
+   */
+  static get(): number {
+    return Dimensions.get('window').scale
+  }
+
+  /**
+   * No equivalent for Web
+   */
+  static getFontScale(): number {
+    return Dimensions.get('window').fontScale || PixelRatio.get()
+  }
+
+  /**
+   * Converts a layout size (dp) to pixel size (px).
+   * Guaranteed to return an integer number.
+   */
+  static getPixelSizeForLayoutSize(layoutSize: number): number {
+    return Math.round(layoutSize * PixelRatio.get())
+  }
+
+  /**
+   * Rounds a layout size (dp) to the nearest layout size that corresponds to
+   * an integer number of pixels. For example, on a device with a PixelRatio
+   * of 3, `PixelRatio.roundToNearestPixel(8.4) = 8.33`, which corresponds to
+   * exactly (8.33 * 3) = 25 pixels.
+   */
+  static roundToNearestPixel(layoutSize: number): number {
+    const ratio = PixelRatio.get()
+    return Math.round(layoutSize * ratio) / ratio
+  }
+}
diff --git a/src/apis/Platform/index.js b/src/apis/Platform/index.js
new file mode 100644
index 00000000..3daad955
--- /dev/null
+++ b/src/apis/Platform/index.js
@@ -0,0 +1,8 @@
+import { canUseDOM } from 'exenv'
+
+const Platform = {
+  OS: 'web',
+  userAgent: canUseDOM ? window.navigator.userAgent : ''
+}
+
+export default Platform
diff --git a/src/apis/UIManager/__tests__/index-test.js b/src/apis/UIManager/__tests__/index-test.js
new file mode 100644
index 00000000..e12cf88f
--- /dev/null
+++ b/src/apis/UIManager/__tests__/index-test.js
@@ -0,0 +1,100 @@
+/* eslint-env mocha */
+
+import assert from 'assert'
+import UIManager from '..'
+
+const createNode = (style = {}) => {
+  const root = document.createElement('div')
+  Object.keys(style).forEach((prop) => {
+    root.style[prop] = style[prop]
+  })
+  return root
+}
+
+let defaultBodyMargin
+
+suite('apis/UIManager', () => {
+  setup(() => {
+    // remove default body margin so we can predict the measured offsets
+    defaultBodyMargin = document.body.style.margin
+    document.body.style.margin = 0
+  })
+
+  teardown(() => {
+    document.body.style.margin = defaultBodyMargin
+  })
+
+  suite('measure', () => {
+    test('provides correct layout to callback', () => {
+      const node = createNode({ height: '5000px', left: '100px', position: 'relative', top: '100px', width: '5000px' })
+      document.body.appendChild(node)
+
+      UIManager.measure(node, (x, y, width, height, pageX, pageY) => {
+        assert.equal(x, 100)
+        assert.equal(y, 100)
+        assert.equal(width, 5000)
+        assert.equal(height, 5000)
+        assert.equal(pageX, 100)
+        assert.equal(pageY, 100)
+      })
+
+      // test values account for scroll position
+      window.scrollTo(200, 200)
+      UIManager.measure(node, (x, y, width, height, pageX, pageY) => {
+        assert.equal(x, 100)
+        assert.equal(y, 100)
+        assert.equal(width, 5000)
+        assert.equal(height, 5000)
+        assert.equal(pageX, -100)
+        assert.equal(pageY, -100)
+      })
+
+      document.body.removeChild(node)
+    })
+  })
+
+  suite('measureLayout', () => {
+    test('provides correct layout to onSuccess callback', () => {
+      const node = createNode({ height: '10px', width: '10px' })
+      const middle = createNode({ padding: '20px' })
+      const context = createNode({ padding: '20px' })
+      middle.appendChild(node)
+      context.appendChild(middle)
+      document.body.appendChild(context)
+
+      UIManager.measureLayout(node, context, () => {}, (x, y, width, height) => {
+        assert.equal(x, 40)
+        assert.equal(y, 40)
+        assert.equal(width, 10)
+        assert.equal(height, 10)
+      })
+
+      document.body.removeChild(context)
+    })
+  })
+
+  suite('updateView', () => {
+    test('adds new className to existing className', () => {
+      const node = createNode()
+      node.className = 'existing'
+      const props = { className: 'extra' }
+      UIManager.updateView(node, props)
+      assert.equal(node.getAttribute('class'), 'existing extra')
+    })
+
+    test('adds new style to existing style', () => {
+      const node = createNode({ color: 'red' })
+      const props = { style: { opacity: 0 } }
+      UIManager.updateView(node, props)
+      assert.equal(node.getAttribute('style'), 'color: red; opacity: 0;')
+    })
+
+    test('sets attribute values', () => {
+      const node = createNode()
+      const props = { 'aria-level': '4', 'data-of-type': 'string' }
+      UIManager.updateView(node, props)
+      assert.equal(node.getAttribute('aria-level'), '4')
+      assert.equal(node.getAttribute('data-of-type'), 'string')
+    })
+  })
+})
diff --git a/src/apis/UIManager/index.js b/src/apis/UIManager/index.js
new file mode 100644
index 00000000..073864ff
--- /dev/null
+++ b/src/apis/UIManager/index.js
@@ -0,0 +1,35 @@
+import CSSPropertyOperations from 'react/lib/CSSPropertyOperations'
+
+const measureAll = (node, callback, relativeToNativeNode) => {
+  const { height, left, top, width } = node.getBoundingClientRect()
+  const relativeNode = relativeToNativeNode || node.parentNode
+  const relativeRect = relativeNode.getBoundingClientRect()
+  const x = left - relativeRect.left
+  const y = top - relativeRect.top
+  callback(x, y, width, height, left, top)
+}
+
+const UIManager = {
+  measure(node, callback) {
+    measureAll(node, callback)
+  },
+
+  measureLayout(node, relativeToNativeNode, onFail, onSuccess) {
+    measureAll(node, (x, y, width, height) => onSuccess(x, y, width, height), relativeToNativeNode)
+  },
+
+  updateView(node, props) {
+    for (const prop in props) {
+      const value = props[prop]
+      if (prop === 'style') {
+        CSSPropertyOperations.setValueForStyles(node, value)
+      } else if (prop === 'className') {
+        node.classList.add(value)
+      } else {
+        node.setAttribute(prop, value)
+      }
+    }
+  }
+}
+
+export default UIManager
diff --git a/src/modules/NativeMethodsMixin/index.js b/src/modules/NativeMethodsMixin/index.js
new file mode 100644
index 00000000..503cf0d8
--- /dev/null
+++ b/src/modules/NativeMethodsMixin/index.js
@@ -0,0 +1,100 @@
+/**
+ * Copyright (c) 2015-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * @flow
+ */
+
+import { Component } from 'react'
+import ReactDOM from 'react-dom'
+import UIManager from '../../apis/UIManager'
+
+type MeasureOnSuccessCallback = (
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+  pageX: number,
+  pageY: number
+) => void
+
+type MeasureLayoutOnSuccessCallback = (
+  left: number,
+  top: number,
+  width: number,
+  height: number
+) => void
+
+const NativeMethodsMixin = {
+  /**
+   * Removes focus from an input or view. This is the opposite of `focus()`.
+   */
+  blur() {
+    ReactDOM.findDOMNode(this).blur()
+  },
+
+  /**
+   * Requests focus for the given input or view.
+   * The exact behavior triggered will depend the type of view.
+   */
+  focus() {
+    ReactDOM.findDOMNode(this).focus()
+  },
+
+  /**
+   * Determines the position and dimensions of the view
+   */
+  measure(callback: MeasureOnSuccessCallback) {
+    UIManager.measure(
+      ReactDOM.findDOMNode(this),
+      mountSafeCallback(this, callback)
+    )
+  },
+
+  /**
+   * Measures the view relative to another view (usually an ancestor)
+   */
+  measureLayout(
+    relativeToNativeNode: number,
+    onSuccess: MeasureLayoutOnSuccessCallback,
+    onFail: () => void /* currently unused */
+  ) {
+    UIManager.measureLayout(
+      ReactDOM.findDOMNode(this),
+      relativeToNativeNode,
+      mountSafeCallback(this, onFail),
+      mountSafeCallback(this, onSuccess)
+    )
+  },
+
+  /**
+   * This function sends props straight to the underlying DOM node.
+   */
+  setNativeProps(nativeProps: Object) {
+    UIManager.updateView(
+      ReactDOM.findDOMNode(this),
+      nativeProps
+    )
+  }
+}
+
+/**
+ * In the future, we should cleanup callbacks by cancelling them instead of
+ * using this.
+ */
+const mountSafeCallback = (context: Component, callback: ?Function) => () => {
+  if (!callback || (context.isMounted && !context.isMounted())) {
+    return
+  }
+  return callback.apply(context, arguments)
+}
+
+export default NativeMethodsMixin
+
+export const nativeMethodsDecorator = (Component) => {
+  Object.keys(NativeMethodsMixin).forEach((method) => {
+    Component.prototype[method] = NativeMethodsMixin[method]
+  })
+  return Component
+}