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Yauaa: Yet Another UserAgent Analyzer

Travis Build status Coverage Status License Maven Central If this project has business value for you then don't hesitate to support me with a small donation.

This is a java library that tries to parse and analyze the useragent string and extract as many relevant attributes as possible.

A bit more background about this useragent parser can be found in this blog which I wrote about it:

The full documentation can be found here

IMPORTANT: Version 5.1 is bad.

If you are using version 5.1 you should upgrade IMMEDIATELY to 5.2 because 5.1 crashes over specific useragent patterns caused by a simple packaging mistake.

Mozilla/1.2.3 (

Example output

As an example the useragent of my phone:

Mozilla/5.0 (Linux; Android 7.0; Nexus 6 Build/NBD90Z) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.124 Mobile Safari/537.36

is converted into this set of fields:

Field name Value
DeviceClass 'Phone'
DeviceName 'Google Nexus 6'
DeviceBrand 'Google'
OperatingSystemClass 'Mobile'
OperatingSystemName 'Android'
OperatingSystemVersion '7.0'
OperatingSystemNameVersion 'Android 7.0'
OperatingSystemVersionBuild 'NBD90Z'
LayoutEngineClass 'Browser'
LayoutEngineName 'Blink'
LayoutEngineVersion '53.0'
LayoutEngineVersionMajor '53'
LayoutEngineNameVersion 'Blink 53.0'
LayoutEngineNameVersionMajor 'Blink 53'
AgentClass 'Browser'
AgentName 'Chrome'
AgentVersion '53.0.2785.124'
AgentVersionMajor '53'
AgentNameVersion 'Chrome 53.0.2785.124'
AgentNameVersionMajor 'Chrome 53'

Try it!

You can try it online with your own browser here:


  1. This runs under a "Free quota" on Google AppEngine. If this quota is exceeded then it will simply become unavailable for that day.
  2. After a while of inactivity the instance is terminated so the first page may take 15-30 seconds to load.
  3. If you really like this then run it on your local systems. It's much faster that way.


If this project has business value for you then don't hesitate to support me with a small donation.

Donations via PayPal


Yet Another UserAgent Analyzer
Copyright (C) 2013-2018 Niels Basjes

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.