Honest comparison · Updated 2026-09-18
Contrasta vs WebAIM Contrast Checker
WebAIM's Contrast Checker is the tool nearly every designer and developer has bookmarked at some point — it's the reference implementation many accessibility guides link to. Contrasta exists because that workflow means switching to a browser, typing hex codes, and leaving your design tool. Here's an honest look at both.
Dimension-by-dimension
| Dimension | Contrasta | WebAIM Contrast Checker | Edge |
|---|---|---|---|
| Where it lives | Native iOS app — check a contrast pair without leaving what you're doing, works on your phone or iPad. | A website you open in a browser tab and keep switching back to. | |
| Picking a color | Eyedropper samples color directly from any photo or screenshot on your device. | Manual hex entry only — no camera or screen sampling. | |
| Contrast metrics | Both WCAG 2.x ratio (AA/AAA/UI badges) and the newer APCA Lc perceptual score. | WCAG 2.x ratio only — no APCA support. | |
| Offline use | Fully offline, no network needed. | Requires an internet connection to load the page. | |
| Track record & trust | New app, unproven with real teams yet. | The de facto reference tool for over a decade — cited directly in countless accessibility guides and used by huge design teams daily. | |
| Price | Free, no account. | Free, no account. |
Contrasta advantage · WebAIM Contrast Checker advantage · roughly equal
Where Contrasta wins
- Eyedropper from any photo — sample a color straight from a screenshot or design mockup instead of typing hex codes by hand.
- APCA support — WebAIM only checks the older WCAG 2.x ratio; Contrasta also gives you the newer perceptual APCA score.
- Lives on your phone, so a contrast check doesn't mean opening a browser and hunting for the tab you last had it in.
Where WebAIM Contrast Checker wins
- It's the industry reference. WebAIM's checker predates almost every alternative and is what most accessibility documentation links to by name.
- Desktop-first workflows where you're already in a browser next to your design tool may find tab-switching faster than reaching for a phone.
Pick Contrasta if…
You want a contrast check without leaving your phone or tablet, want the newer APCA metric alongside WCAG, or want to sample a color straight from a photo.
See ContrastaPick WebAIM Contrast Checker if…
You're already at a desktop browser and just want the tool everyone else's documentation already points to.
Visit WebAIM Contrast Checker siteSame underlying math, different workflow. WebAIM built the reference; Contrasta is the pocket version with one extra metric.
Frequently asked questions
What's the main difference between Contrasta and WebAIM Contrast Checker?+
WebAIM's Contrast Checker is the tool nearly every designer and developer has bookmarked at some point — it's the reference implementation many accessibility guides link to. Contrasta exists because that workflow means switching to a browser, typing hex codes, and leaving your design tool. Here's an honest look at both
Should I choose Contrasta or WebAIM Contrast Checker?+
Pick Contrasta if: You want a contrast check without leaving your phone or tablet, want the newer APCA metric alongside WCAG, or want to sample a color straight from a photo. Pick WebAIM Contrast Checker if: You're already at a desktop browser and just want the tool everyone else's documentation already points to.
What can Contrasta do that WebAIM Contrast Checker can't?+
Eyedropper from any photo — sample a color straight from a screenshot or design mockup instead of typing hex codes by hand. APCA support — WebAIM only checks the older WCAG 2.x ratio; Contrasta also gives you the newer perceptual APCA score. Lives on your phone, so a contrast check doesn't mean opening a browser and hunting for the tab you last had it in.
Where does WebAIM Contrast Checker win over Contrasta?+
It's the industry reference. WebAIM's checker predates almost every alternative and is what most accessibility documentation links to by name. Desktop-first workflows where you're already in a browser next to your design tool may find tab-switching faster than reaching for a phone.
How much does Contrasta cost compared to WebAIM Contrast Checker?+
Contrasta: Free, no account. WebAIM Contrast Checker: Free, no account.