The contrast settings of some websites may be difficult to see for people with low vision or may cause eyestrain. This feature allows the user to choose preferred contrast settings.
Discussion by Disabilities
Adjustable contrast settings allow people with low vision to personalize contrast settings so that colors are distinct and easy to see.
Please note that these products are not necessarily endorsed by RtF, but represent the range of available options.
Open Source and free
These products are free and their source code may be modified with few restrictions.
- AccessiBar Extension – Mozdev, Edan Kemelman
- Amaya – W3C
- CLC Star – CLC (Charles Chen)
- Web Access Gateway – U.of Cambridge, Silas Brown
Free, not necessarily open source
These products are free to use, but may have strict restrictions on viewing and modifying source code.
- Surf Right Toolbar – Royal National Institute of Blind People (RNIB)
- Web Accessibility Toolbar – Web Accessibility Tools Consortium
- Web Adaptation Technology – IBM
- Color Contrast Analyzer- The Paciello Group
- Color Contrast Analyzer- Firefox Extension
- Colors on the Web
- Color Contrast Check- snook.ca
- Color Contrast Ratio Calculator
Commercial, with free trial
These products are free to try for a limited period of time or with limited functionality. They must be purchased for full functionality.
- Screen Tinter – Thomson Software Solutions
Commercial, no free trial
These products must be purchased to be used, and did not offer free trials at the time of posting.
- WebAdapt2Me – IBM
Related Research and Papers
- Maximizing Usability: The Principles of Universal Design- Molly Follette Story M.S.
- Web accessibility: a broader view- John T. Richards, Vicki L. Hanson
- Adjustable access electronic books- B.C. Pobiak
- Atypical Color Response- W3C