BrowserSense logs information about the browser accessing your RubyOnRails app. Installation is pretty simple: 1. Add =gem "browser_sense"= to your Gemfile 2. Add the following line to your =application_controller.rb=: browser_sense Data is stored in csv format in Rails' production log. Each URL invocation generates a log line. Extract browser info data with: grep BrowserSense development.log | cut -f2- -d: Analyize with browser-info log/production.log > output.txt or with log_sense (https://rubygems.org/gems/log_sense) BrowserSense relies on the browser gem to get informaton about the browsers.