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Color System Tool Free — Build a complete design palette, right in your browser
A complete color system — no strings attached.
Color System Tool Free generates a full, professional design palette from a single base color. Primary, Secondary, Accent, Neutral, and Semantic scales — all computed in LCH color space for perceptually even steps. Pick a color, hit Generate, and your system is ready to explore.
No account. No install. No time limit. Open the file in any browser and start working.
What you get
5 color groups, fully generated:
- Primary, Secondary, Accent — each with a 50–900 perceptual scale (10 stops)
- Neutral — subtly tinted toward your primary hue so it looks designed, not generic
- Semantic — Success, Warning, Error, Info, auto-harmonized to your palette
7 color harmony modes: Monochromatic · Analogous · Complementary · Triadic · Split-complementary · Tetradic · Square — each button shows a live mini-preview before you commit.
Extract colors from any photo — drag & drop an image (or click to browse) and the tool pulls out the dominant colors using in-browser analysis. Your photo never leaves your device.
Fine-tune with hex, HSL, or the color picker — all inputs stay in sync. Edit any of them after generating and the whole system regenerates live.
Live UI preview — a mock interface rendered with your actual palette, in both light and dark mode.
WCAG accessibility checker — contrast ratios and AA/AAA badges for every key foreground/background pair.
Lock & regenerate — lock scales you love, regenerate the rest for variations.
Preview all 7 export formats — see exactly what your CSS, Tailwind config, SCSS, JSON tokens, SVG sheet, PNG sheet, and Adobe .ASE would look like before you commit to Pro.
What's different in Free vs Pro
The Free version is a full-featured color system builder. The only thing it doesn't do is let you copy or download the generated code and files.
All 7 export formats are visible in the Free version — you can inspect every line of CSS, every token, every swatch — but Copy to clipboard and Download are unlocked in Pro.
If you're exploring, learning, or pitching a palette to a client, Free does everything you need. When you're ready to ship it into a real project, that's when Pro makes sense.
Pro is $9, one-time. Get Pro →
Who it's for
- Designers exploring color systems before committing to a direction
- Students learning how professional design palettes are structured
- Anyone who wants to test a palette against real UI and WCAG standards before deciding to export
How it works
- Pick or paste your base hex color — or extract one from a photo
- Choose a harmony mode
- Hit Generate System
- Explore, adjust, and preview every export format
Single HTML file. No install. No account. No internet needed after download. Opens in any modern browser on Mac, Windows, or Linux.
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WHAT'S IN THE DOWNLOAD
CST_Free.html— the complete tool, single self-contained file