On Windows I regularly used Colour Contrast Analyser for determining how well websites meet visual accessibility guidelines, however I have now moved to Ubuntu, and am looking for a tool that will provide similar functionality.


  • Offline (no web apps)
  • Calculates the difference in contrast of two colours and outputs results according to WCAG 2.0 guidelines
  • Colours are entered in hexadecimal format (eg. #FFFFFF)

Preferred features:

  • Colours are selectable from the screen (so I don't have to bother with a two-step process selecting the colours with Gpick, then copy/pasting them over)


  • Native program is preferable, but a Chrome extension is acceptable if nothing else matches my criteria

The Colour Contrast Analyzer is open source and on github so why not fork it and download a copy of Freepascal Lazarus and port it in your fork, (it should be reasonably trivial to do so as there are utilities for converting the DFM forms).

  • You know what, for all the years I have been using CCA and visiting that webpage, I had never come across the github link for the Windows source, and had thought that only the Mac port was OS. Thanks for pointing that out to me. If I get the time I will try that out, although if there are any ready-to-install Linux alternatives I would probably try them out first since spare time can be hard to come by. – Ken Herbert May 12 '15 at 8:05
  • I know that feeling, all to well. – Steve Barnes May 12 '15 at 8:40

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