Make accessible app color palettes without the tedium of manual testing.

Your edits get WCAG color contrast tested instantly with simulated color blindness (Machado et al). Transparency is layered for you. Tests appear in summarized grids by appearance (e.g., dark or Apple TV). Drill-down to solve problems or get suggested fixes.

UI mockups — More easily find that text–background combos and visualize chart colors
Batch edits — Apply similar changes to multiple colors (e.g., invert, desaturate 10%)
Import/export — Xcode asset catalogs, Swift, hex, raw triplets, macOS color lists, or use a batch mouse picker
Peer-reviewed color maps — Nearly 70 accessible schemes by scientists for vary data types (e.g., cyclical)
Gradient builder — Generate smooth color ramps using color theory and a perceptual color space
Snapshots — See before/afters or create branches in your document

What’s WCAG? — Apple recommends developers follow the Web Content Accessibility Guidelines for interfaces. A few requirements relate to ensuring text and meaningful UI elements are legible for people with low to moderate visual acuity or color blindness. To get a feel for WCAG’s definition of a contrast ratio, you might enjoy my other app, WCAG Shades, that strips your camera of any pixels failing a WCAG test.

What’s New

Version 1.12

Updated onboarding

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

App Privacy

The developer, Ryan Ferrell, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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