Build your Color Contrast Checker with AI in under 5 minutes
Build a WCAG color contrast checker that grades any foreground/background pair against AA and AAA for normal text, large text, and UI components — with a live preview and an auto-accessible-text suggestion, generated from a single prompt.
Comment ça fonctionne
Étape 1
Décrivez votre idée
Rédigez une invite en texte libre décrivant ce que vous souhaitez.
Étape 2
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Étape 3
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Pourquoi créer avec l'IA plutôt que de faire appel à un développeur ?
| FloopFloop | Développeur traditionnel | |
|---|---|---|
| Délai de lancement | Moins de 5 minutes | 2 à 8 semaines |
| Coût | À partir de 0 $ | 5 000 $ - 50 000 $+ |
| Maintenance | Incluse | Prestataire récurrent |
What is a color contrast checker?
A color contrast checker tells you whether two colours are legible together, measured against the WCAG accessibility standard. The canonical tools — the WebAIM contrast checker, the Coolors contrast tool, contrast-ratio.com — all answer the same question a designer or developer asks dozens of times a week: is this text readable on this background, and does it pass the bar an audit (or the law, in many jurisdictions) will hold it to? The platonic checker is instant and concrete: you pick two colours, you get a single ratio number, a clear AA/AAA pass-or-fail, and — crucially — a preview of real text rendered in those colours so the verdict isn't abstract. Because the maths is pure relative-luminance arithmetic, there is no reason it should round-trip to a server, and a tool that does makes a private brand palette someone else's analytics event.
Common features
- Foreground + background inputs with a native colour picker and a hex field
- A large contrast-ratio readout (1:1 to 21:1)
- AA / AAA pass-fail for normal text, large text, and UI components
- A live foreground-on-background preview specimen with real sample text
- An 'auto text colour' button that picks the best of black/white
- Swap foreground and background in one click
- Hex parsing that accepts 3-, 6-, and 8-digit values with or without #
- Copy-the-result for pasting into a ticket or design review
- Last colour pair remembered on the device
- Light and dark theme variants
Real-world examples
Passing an accessibility audit
A developer pastes the brand's link colour against the page background, sees it fails AA at 3.9:1, nudges the hue until the readout flips green at 4.6:1, and ships the fix before the audit reopens the ticket.
Choosing readable button text
A designer drops the brand accent into the background field, taps 'auto text colour' to get white, and confirms the 5.2:1 ratio passes for the button label without eyeballing it.
Documenting a design system
A team stands up a checker on their subdomain so every contributor verifies a colour pair against AA the same way, with the same preview, instead of trusting screenshots.
Why FloopFloop fits color contrast checker projects
Accessibility tools are exactly the kind of thing that should be free, fast, and yours. FloopFloop ships the contrast checker you want — the thresholds you care about, the preview text that matches your product, your brand palette baked in if you like — on your own domain, with the colours never leaving the browser. The 'inspection lab' look that ships by default reads like a precise instrument rather than a marketing page, and the whole thing is one prompt away from being whatever fits your team.
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Build a color contrast checker. Two colour inputs (a native picker plus a hex field) for foreground and background, then a big contrast-ratio readout and a WCAG pass/fail grid: AA and AAA for normal text (4.5 / 7), large text (3 / 4.5), and UI components (3). Add a live foreground-on-background preview specimen with sample text, a swap button, and an 'auto text colour' button that picks black or white for the best contrast. Visual: a clean light 'accessibility inspection lab' — instrument-style ratio readout, green/red compliance chips.
Create a WCAG contrast tool like the WebAIM contrast checker. Compute the contrast ratio from the relative-luminance formula in the browser, show whether it passes AA/AAA, and update everything live as the colours change. Keep it entirely client-side — nothing about the colours leaves the page.
Build an accessibility colour tester for designers. Paste two hex values, see the ratio and AA/AAA badges, and preview real headings, body copy, and a button rendered in those colours so the result is concrete rather than just a number. Add a dark theme variant.
Build a contrast-ratio checker that helps fix failures, not just flag them. Show the current ratio and, when it fails AA, suggest the nearest accessible foreground (black or white) with a one-click apply. Remember the last colour pair on the device.
Foire aux questions
How is this different from the WebAIM contrast checker or Coolors?
Which WCAG thresholds does it check?
Are my colours sent anywhere?
What does the 'auto text colour' button do?
Can it check a whole palette at once?
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