Head-to-head · Color Contrast Checker Software
WebAIM Contrast Checker vs Acquia Color Contrast Checker (formerly Monsido Contrast Checker)
WebAIM Contrast Checker leads on 1 check, Acquia Color Contrast Checker (formerly Monsido Contrast Checker) on 0, and 2 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreWebAIM Contrast Checker · 9.1/10
- Free planboth
- Most featuresWebAIM Contrast Checker · 1 of 2
WebAIM Contrast Checker scores higher on our rubric for color contrast checker software: 9.1 against 9.0 out of 10; our editors rank them #1 and #2.
On contrast modes, WebAIM Contrast Checker gives you Text and graphics where Acquia Color Contrast Checker (formerly Monsido Contrast Checker) offers Text. WebAIM Contrast Checker offers contrast suggestions; Acquia Color Contrast Checker (formerly Monsido Contrast Checker) doesn't.
WebAIM Contrast Checker is the better fit for teams needing a free checker and basic API. Acquia Color Contrast Checker (formerly Monsido Contrast Checker) is the better fit for buyers who want a simple, established web checker.
- WebAIM Contrast Checker fits best
Teams needing a free checker and basic API
- Acquia Color Contrast Checker (formerly Monsido Contrast Checker) fits best
Buyers who want a simple, established web checker
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Side by side
| Feature | WebAIM Contrast Checker 9.1/10 Visit ↗ | Acquia Color Contrast Checker (formerly Monsido Contrast Checker) 9.0/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 9.1 | 9.0 |
| Ranking | #1 in Color Contrast Checker Software | #2 in Color Contrast Checker Software |
| Best for | Teams needing a free checker and basic API | Buyers who want a simple, established web checker |
| Pricing model | Free | Free |
| Starting price | Free plan | Free plan |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Cloud, Browser extension | Cloud |
| Platforms | Web | Web |
| Built for | Solo, Small business, Mid-market, Enterprise | Solo, Small business, Mid-market, Enterprise |
| Features WebAIM Contrast Checker 1/2 · Acquia Color Contrast Checker (formerly Monsido Contrast Checker) 0/2 | ||
| Contrast suggestions | ✓ (best) | — |
| Batch color-pair checks | — | — |
| Specs | ||
| WCAG standards | Not checked yet | 2.2 |
| Contrast modes | Text and graphics | Text |
| Design integrations | Not checked yet | Not checked yet |
| Platforms | web, api | web |
| Our review | ||
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| Cons |
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| Our verdict | WebAIM Contrast Checker is a browser-based tool for evaluating foreground and background color contrast. It suits designers, developers, and accessibility teams who need to assess text and interface colors without paying for a checker.… Read the review → |
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… Read the review → |
Strengths and trade-offs
WebAIM Contrast Checker — where it wins
- Checks text and graphical/UI contrast with WCAG AA and AAA results
- Color picker, alpha adjustment, and lightness sliders aid color exploration
- Basic API and bookmarklet extend checking beyond the main web tool
Where it doesn't
- Evaluates one foreground/background color pair at a time
- Published WCAG coverage is 2.0 and 2.1, not 2.2
- API is described as basic rather than a broader integration suite
Acquia Color Contrast Checker (formerly Monsido Contrast Checker) — 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
- WebAIM Contrast Checker9.1/10 · Free plan
A free web checker for text and UI contrast, with a basic API and bookmarklet.
Visit WebAIMFull verdict → - Acquia Color Contrast Checker (formerly Monsido Contrast Checker)9.0/10 · Free plan
A free web checker for reviewing color pairs against WCAG contrast thresholds.
Visit AcquiaFull verdict →
More comparisons
- WebAIM Contrast Checker vs Silktide Color Contrast Checker
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- WebAIM Contrast Checker vs Color Contrast
- WebAIM Contrast Checker vs Colors on the Web Contrast Checker
- WebAIM Contrast Checker vs Accessibility.build Desktop
- Acquia Color Contrast Checker (formerly Monsido Contrast Checker) vs Silktide Color Contrast Checker
- Acquia Color Contrast Checker (formerly Monsido Contrast Checker) vs Colour Contrast Analyser (CCA)
All color contrast checker software comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update