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A fast User Agent parser library, using data from

**NOTE:** As of December 1, 2014, the upstream User Agent database is no longer free and the old update URL is returning *bad data*.

This means that the OnlineUpdater, OnlineUpdateUASparser, and CachingOnlineUpdateUASparser APIs will retrieve an incorrect database and must be disabled immediately. If you were using any of these methods, please update your code as in the example below.

You may continue to use this library with the bundled UA database, as long as updating is disabled.


UASparser is available via Maven Central:

  • Group ID: cz.mallat.uasparser
  • Artifact ID: uasparser

View the latest artifact info.


Simply use UASparser or any of its subclasses like so:

UASparser parser = new UASparser(OnlineUpdater.getVendoredInputStream());
UserAgentInfo info = parser.parse("Mozilla/4.0 (compatible; MSIE 7.0;
Windows NT 5.1; )");

This will create a new parser and initialize it with a bundled copy of the database.

In addition, there are a few different parser classes available:

  • UASparser - Default parser, thread-safe
  • MultithreadedUASparser - A faster variant of UASparser, uses a bit more memory
  • SingleThreadedUASparser - Non-threadsafe variant, ideal for Hadoop and similar use cases
  • BrowserFamilyParser - UASparser subclass which only returns the browser family string


Building requires Apache buildr:

$ [sudo] gem install buildr

To build UASparser:

$ git clone
$ cd UASparser
$ buildr package

Binaries will be placed in target.



0.6.2 - 2014-12-03

  • Disabled online updates (for now)

0.6.1 - 2014-09-09

  • Fixed device detection logic (issue #12, #13)

n/a - 2013-11-16

  • Now available via Maven Central

0.6.0 - 2013-10-08

  • added support for the [device] and [device_reg] sections

0.5.0 - 2013-05-29

  • Handle version API errors (issue #3)
  • Defer initial update on startup (don't block)
  • Apply jitter after every update

0.4.1 - 2013-05-21

  • Added UserAgentInfo#getBrowserVersionInfo() method

  • Documented all UserAgentInfo reader methods

0.4 - 2012-11-08

  • Added a new, fast, thread-safe MultithreadedUASparser (thanks to Michael Remme)

  • New OnlineUpdater class replaces the old OnlineUpdateUASparser and CachingOnlineUpdateUASparser classes which are now deprecated

  • OnlineUpdater will fallback to a vendored copy if no cached version exists and update fails

  • Minor bugfixes


LGPL. See LICENSE file for details.


A high performance User Agent parser for Java



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