Acquia Color Contrast Checker (formerly Monsido Contrast Checker) review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Acquia Color Contrast Checker is a free online tool for people designing website text and other content who need to assess foreground and background color contrast. It accepts RGB and hexadecimal values, or lets users choose colors with its color selector, then provides a contrast ratio and guidance against WCAG thresholds. The checker is available on the web as a standalone tool; it is distinct from Acquia Web Governance, a separately sold platform. Its scope suits an individual color-pair check more than a broader accessibility workflow.

The tool’s focused workflow is its main advantage: enter or select a foreground and background color, review the ratio and WCAG guidance, and adjust lightness as needed. That makes it useful during design decisions when a person wants to assess text contrast without adopting a larger toolset. The category specification identifies text as its contrast mode, with no batch color-pair checking or contrast suggestions. Designers looking for automated alternatives or repeated pair testing will likely need a different checker.

Acquia lists the checker among its free web optimization tools, and the product is presented as a free tool rather than a paid tier of Acquia Web Governance. The former Monsido Contrast Checker URL redirects to Acquia’s checker, so buyers encountering the older name should look for the Acquia product. Choose it for straightforward, no-cost contrast checks and lightness adjustment; choose another option if your workflow depends on multiple contrast modes, suggested replacements, or batch review.

Acquia Color Contrast Checker (formerly Monsido Contrast Checker) pros and cons

• Where it wins
  • Checks foreground/background contrast and shows ratio guidance against WCAG thresholds
  • Accepts RGB and hexadecimal values, with an on-page color selector
  • Lets you adjust color lightness while reviewing a color pair
• Where it doesn't
  • Checks text contrast only, rather than other contrast modes
  • Does not suggest alternative colors that meet contrast guidance
  • Does not support batch checking of color pairs

Acquia Color Contrast Checker (formerly Monsido Contrast Checker) fact sheet, pricing and score →

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Last updated 20 Oct 2026 · How we research and update