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Ratio review

Free#16 of 23 in Color Contrast Checker Software

A free desktop tool for checking color pairs against WCAG contrast criteria.

6.7/10Editor score
Visit Ratio
Ratio6.7 Visit Ratio

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Ratio is a free desktop color-contrast checker for designers and developers working on macOS or Linux. It validates color pairs with WCAG algorithms and covers text contrast (1.4.3), non-text contrast (1.4.11), and focus appearance (2.4.13). Its scope fits people who want to assess UI colors on their desktop, including solo practitioners and small teams, rather than manage a broader accessibility workflow in one product.

The core workflow centers on a foreground/background pair: users can select colors, then view a contrast score and the hex values. Coverage across text, graphics, and UI matters for interface work because contrast checks extend beyond text alone. Focus appearance is also included, making Ratio relevant when reviewing focus indicators. The published feature set is specific to validating contrast and selecting colors; it does not describe integrations or suggested color fixes. Choose it when those direct checks are the goal, not when your process depends on a connected design or development ecosystem.

Ratio is free and described by its developer as a personal project offered to others, with an optional way to support the creator. There are no paid tiers to compare, so the decision is primarily about platform and scope: macOS and Linux users seeking a desktop checker have a straightforward fit. Those on other platforms, or buyers looking for integrations, automated suggestions, or AI features, should consider a tool aligned with those needs. For a focused, no-cost check of text, non-text, and focus contrast, Ratio keeps the job narrow.

Ratio pros and cons

  • Where it wins
    • Checks WCAG text, non-text, and focus-appearance criteria.
    • Shows contrast scores and hex values for selected colors.
    • Includes tools for choosing foreground and background colors.
  • Where it doesn't
    • Available for macOS and Linux, not other listed platforms.
    • Focused on contrast checks and color selection rather than integrations.
    • Does not provide AI features.

Ratio fact sheet, pricing and score →

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