What is the Color Contrast Checker (WCAG)?
Enter a foreground and background color and get the WCAG contrast ratio. Shows pass/fail for normal text (AA: 4.5:1, AAA: 7:1) and large text (AA: 3:1, AAA: 4.5:1). Essential for accessible design.
The tool is part of the Calabi free tools hub — a collection of 99+ browser-based utilities for developers, designers, and content creators. Everything runs client-side: your files and data never leave your device.
How to use the Color Contrast Checker (WCAG)
- Step 1: Enter the foreground (text) color.
- Step 2: Enter the background color.
- Step 3: Read the contrast ratio and WCAG grades.
The tool updates in real time as you interact with it. No button-clicking required for most tools — results appear instantly.
Example
#C9A961 on #0E0C09 → contrast 7.2:1 — passes WCAG AAA
Privacy & security
The Color Contrast Checker (WCAG) is designed with privacy as a hard constraint, not an afterthought:
- No upload: Your data is processed in your browser's JavaScript engine. No HTTP request is made to any server while you use the tool.
- No account required: The tool works instantly — no email, no sign-up, no cookie consent wall.
- No logging: Calabi does not log what you paste, upload, or generate. The server only delivers the HTML/JS page — it never sees your content.
- Open to inspection: Open your browser's network inspector while using the tool. You'll see zero outbound requests related to your data.
This architecture is particularly important for the Design category of tools, where the inputs often contain sensitive or proprietary information.
Frequently asked questions
Is the Color Contrast Checker (WCAG) free to use?
Yes, completely free with no registration, no watermark, and no limit on how many times you use it.
Does it work on mobile?
Yes. The tool works on any modern browser including mobile — Chrome, Firefox, Safari, and Edge are all supported.
Will my files be uploaded anywhere?
No. All processing happens in your browser. Your images never leave your device.
Can I use the Color Contrast Checker (WCAG) for commercial projects?
Yes. There are no restrictions on commercial use. The tool is free for personal and commercial projects alike.
About Design tools
The Color Contrast Checker (WCAG) is part of the Design tools category in the Calabi tools hub. Check the contrast ratio between two colors and see if they pass WCAG AA and AAA accessibility standards. All tools in this category run entirely in your browser with no server involvement.