Adjust contrast

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.

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(link is external) – Mozdev, Edan Kemelman
• Amaya(link is external) – W3C
• CLC Star(link is external) – CLC (Charles Chen)
• Web Access Gateway(link is external) – 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(link is external) – Royal National Institute of Blind People (RNIB)
• Web Accessibility Toolbar(link is external) – Web Accessibility Tools Consortium
• Web Adaptation Technology(link is external) – IBM
• Color Contrast Analyzer(link is external)- The Paciello Group
• Color Contrast Analyzer(link is external)- Firefox Extension
• Colors on the Web(link is external)
• Color Contrast Check(link is external)- snook.ca
• Color Contrast Ratio Calculator(link is external)

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(link is external) – 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(link is external) – IBM

• Maximizing Usability: The Principles of Universal Design(link is external)- Molly Follette Story M.S.
• Web accessibility: a broader view(link is external)- John T. Richards, Vicki L. Hanson
• Adjustable access electronic books(link is external)- B.C. Pobiak
• Atypical Color Response(link is external)- W3C