Accessibility testing
Check contrast and color choices against WCAG as you design.
Grade color pairs against WCAG 2.1 AA and AAA, score them with APCA, simulate color-vision deficiencies, and preview layouts at real device sizes. Automated checks are a starting point, not proof of conformance.
Contrast grading
WCAG 2.1 ratios with AA and AAA grades, APCA Lc scores, and accessible-color suggestions.
Color vision
Simulate common color-vision deficiencies so meaning never depends on color alone.
Real viewports
Check layouts at exact device sizes and zoom levels before they reach users.
What you can do today
- Grade text and UI color pairs against WCAG 2.1 AA and AAA
- Score contrast with APCA and get accessible alternatives
- Simulate color-blindness across a palette
- Review layouts in device frames with breakpoint references
Scope and limits
- Contrast and color checks cover part of WCAG, not all of it
- Keyboard, screen-reader, and content checks need manual review
- No automated tool alone proves conformance
In the product
The tools behind this page.
Each of these is available in Testnir today.
- A11y ContrastWCAG 2.1 ratios with AA/AAA grades plus APCA Lc scoring, live text preview, accessible-color suggestions, and color-blindness simulation.
- Color PickerInteractive picker with HEX/RGB/HSL/HSV/CMYK/LAB/OKLCH output, harmony palettes, 50-950 tonal scales, gradients, and color-blindness simulation.
- Viewport ReferenceLive device-frame preview at exact sizes, 40+ device presets, breakpoint references (Tailwind/Bootstrap/MUI/Chakra), and a media-query generator.
See whether Testnir fits your team.
Book a demo of the platform, discuss a testing project, or both. We will reply by email to plan the conversation.