Colour Palette Contrast Checker

1 · Enter the palette

intake

Palette colours (one hex per line)

With or without the #. Include backgrounds, not just accents.

Which is the main background

Used to mark the pairs that matter most.

This tool computes in your browser tab. Nothing you type is uploaded, and nothing is stored on our servers — the work stays in this tab. Redact names and identifying details before you paste anything sensitive.

This is a working tool, not professional advice. Check the important outcome with a qualified human before you rely on it.

2 · The card

ready

Printable spec sheet — $4 one-time

Free tier: unlimited colours, forever.

Printable spec sheet — every pair on one sheet — estimate: ~15 min saved.
Saved palettes shelf — up to 8 palettes in this browser — estimate: ~12 min saved.
Token export — passing pairs as usable combos — estimate: ~20 min saved.

Your one-time purchase stays with you on this device — no account needed, and everything remains private in your browser.

GratisAI checks every pair in my palette for readable contrast — free.