Device.js makes it easy to write conditional CSS and/or JavaScript based on device operating system (iOS, Android, Blackberry, Windows, Firefox OS, MeeGo), orientation (Portrait vs. Landscape), and type (Tablet vs. Mobile).
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Device.js makes it easy to write conditional CSS and/or JavaScript based on device operating system (iOS, Android, Blackberry, Windows, Firefox OS, MeeGo, AppleTV, etc), orientation (Portrait vs. Landscape), and type (Tablet vs. Mobile).

View the Demo →


Device.js inserts CSS classes into the <html> element.


Android Tablet

Blackberry Tablet


  • iOS: iPhone, iPod, iPad
  • Android: Phones & Tablets
  • Blackberry: Phones & Tablets
  • Windows: Phones & Tablets
  • Firefox OS: Phones & Tablets


Just include the script. The script then updates the <html> section with the appropriate classes based on the device's characteristics.

<script src="device.js"></script>
bower install devicejs


The following tables map which CSS classes are added based on device and orientation.

Device CSS Class Names

Device CSS Classes
iPad ios ipad tablet
iPhone ios iphone mobile
iPod ios ipod mobile
Android Phone android mobile
Android Tablet android tablet
BlackBerry Phone blackberry mobile
BlackBerry Tablet blackberry tablet
Windows Phone windows mobile
Windows Tablet windows tablet
Firefox OS Phone fxos mobile
Firefox OS Tablet fxos tablet
MeeGo meego
Desktop desktop
Television television

Orientation CSS Class Names

Orientation CSS Classes
Landscape landscape
Portrait portrait


Device.js also includes support for conditional JavaScript, allowing you to write checks on the following device characteristics:

Device JavaScript Methods

Device JavaScript Method
Tablet device.tablet()
Desktop device.desktop()
iOS device.ios()
iPad device.ipad()
iPhone device.iphone()
iPod device.ipod()
Android Phone device.androidPhone()
Android Tablet device.androidTablet()
BlackBerry device.blackberry()
BlackBerry Phone device.blackberryPhone()
BlackBerry Tablet device.blackberryTablet()
Windows Phone device.windowsPhone()
Windows Tablet device.windowsTablet()
Firefox OS device.fxos()
Firefox OS Phone device.fxosPhone()
Firefox OS Tablet device.fxosTablet()
MeeGo device.meego()
Television device.television()

Orientation JavaScript Methods

Orientation JavaScript Method
Landscape device.landscape()
Portrait device.portrait()

Utility Methods


Run device.js in noConflict mode, returning the device variable to its previous owner. Returns a reference to the device object.

var devicejs = device.noConflict();


Environment detection has a high rate of misuse. Often times, folks will attempt to work around browser feature support problems by checking for the affected browser and doing something different in response. The preferred solution for those kinds of problems, of course, is to check for the feature, not the browser (ala Modernizr).

However, that common misuse of device detection doesn't mean it should never be done. For example, device.js could be employed to change the interface of your web app such that it uses interaction patterns and UI elements common to the device it's being presented on. Android devices might get a slightly different treatment than Windows or iOS, for instance. Another valid use-case is guiding users to different app stores depending on the device they're using.

In short, check for features when you need features, and check for the browser when you need the browser.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Make change(s)
  4. Commit your changes (git commit -am 'Added some feature')
  5. Push to the branch (git push origin my-new-feature)
  6. Create new Pull Request