A colour contrast checker that reframes the result in human terms — showing how a colour pair looks to people with specific vision conditions, rather than just passing or failing a ratio.
Why we recommend it
A contrast ratio is an abstraction that makes accessibility feel like paperwork. Showing the same pairing as someone with deuteranopia or cataracts would see it turns it into a design decision, which is far more persuasive in a review with stakeholders.
Strengths
- Simulates a wide range of vision conditions with plain-language explanations of who is affected and roughly how many people that is. Shareable URLs for a given colour pair, which is useful in design review. Instant, free, no account.
Drawbacks
- Single-purpose — it checks one foreground and background pair at a time and cannot audit a whole palette or a live page. Updates are infrequent; it is a stable utility rather than an evolving product. Simulations are approximations, not a substitute for testing with real users.
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