TintBox

Tintbox is a colour palette generator and export tool for designers and developers. It works completely offline, with no account and no sign-up, and everything you make stays on your device.

Start from any base colour - type an exact HEX, RGB or HSL value or drag the sliders - and Tintbox builds classic colour-theory harmonies around it: complementary, analogous, triadic, monochromatic and tetradic. Pull colours out of a photo you take or choose from your gallery, or use the eyedropper to tap any pixel and sample its exact colour. Save what you like to a local library and back the whole thing up to a ZIP file whenever you want.

WHAT YOU CAN DO
- Pick a base colour with precise HEX, RGB and HSL entry, plus sliders
- Generate five harmony types: complementary, analogous, triadic, monochromatic and tetradic
- Extract a palette from any photo, or eyedrop a single pixel to sample its colour
- Tap any swatch to copy it as HEX, rgb(...) or hsl(...)
- Save, rename and organise palettes in a local library
- Back up and restore everything as a ZIP through the Android share sheet

BUILT-IN ACCESSIBILITY
- WCAG contrast checker: pick any two colours and see the contrast ratio with clear AA and AAA pass/fail marks for normal and large text
- Colour-blindness simulator: preview a palette as it appears with protanopia, deuteranopia and tritanopia
Please note: the contrast checker compares two colours you choose. It is a design aid for checking colour contrast, not a certification of this app's own accessibility.

EXPORT FOR DEVELOPERS
Turn any palette straight into code. CSS custom properties and SCSS variables are always free. Unlock the full set of 17 formats with a single rewarded video, including Less, CSS @theme (Tailwind v4), Tailwind config, JSON, W3C Design Tokens, SwiftUI, Jetpack Compose, Flutter, Android colours XML, MAUI XAML, GIMP/Inkscape .gpl, SVG swatches, and raw HEX, RGB and HSL lists. Tidy the output with optional semantic colour names, hex casing and indentation.

CURATED PALETTE PACKS
Thirty hand-picked, themed palette packs - Coastal, Cyberpunk, Autumn Harvest, Retro and many more - for when you want a designed starting point instead of a generated one. The Essentials pack is free; the rest open while your ad-free window is active.

FREE, WITH ADS
Tintbox is free and supported by Google AdMob. A banner sits at the bottom of the screen, and an occasional interstitial appears when you open the Packs browser. Watching one optional rewarded video opens a 24-hour ad-free window that removes interstitials (the banner stays) and unlocks every export format and palette pack. There are no in-app purchases. Where required, consent for personalised ads is handled through Google's User Messaging Platform.

YOUR PRIVACY
No account, no cloud, no sign-up. Your palettes and any photos you use are stored only on your device. Photos are processed on-device to pick out their colours and are never uploaded or shared anywhere. Reliable, private colour tooling that stays on your phone.