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HTTP user agent sanitizer for mobile phone user agents

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Octocat-spinner-32 lib
Octocat-spinner-32 spec
Octocat-spinner-32 .gitignore
Octocat-spinner-32 .rbenv-version
Octocat-spinner-32 LICENSE
Octocat-spinner-32 Rakefile
Octocat-spinner-32 user_agent_sanitizer.gemspec

User agent sanitizer

Parse a HTTP user agent and attempt to return something that means something to a human. I started this because I needed to sanitize usage statistics by mobile phones. Most user agent parsers focus on the browser, because that is what matters on the desktop. On mobile I care more about the phone than the browser, so those are the details I focus on.


require 'user_agent_sanitizer'

UserAgentSanitizer.sanitize_user_agent('Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3')
# => 'Apple iPhone'

UserAgentSanitizer.sanitize_user_agent('Mozilla/5.0 (Linux; U; Android 2.3.3; nl-nl; SAMSUNG GT-I9100/I9100BUKE5 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1')
# => 'Samsung GT-I9100'

Since version 1.1.0, UserAgentSanitizer.user_agent is available:

ua = UserAgentSanitizer.user_agent('Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3')
# => "Apple"
# => "iPhone"
# => "Apple iPhone"


  • Version 2.0: I care more about devices on mobile. On the desktop, I'll prioritize OS above browser. For this reason I broke backwards compatibility and now detect Microsoft Internet Explorer as the operating system instead of as a browser in its own right.


Via rubygems

gem install user_agent_sanitizer


# Gemfile
gem 'user_agent_sanitizer'

From source:

rake install

New devices

Every time I encounter a new user agent that does not resolve to something useful, I add it as a test case and tweak the parser until all tested headers are correctly parsed. See the spec


Create a Github issue and/or send a pull request.


  • Parse browser from user agent. For mobile this should expose devices using Opera Mini. On the desktop, it should reveal the browser instead of the OS.


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