ProToolBox

Color Harmonizer - Live harmony from one base

Enter a base HEX (or use a preset). See complementary, triadic, and analogous swatches, a labeled list, and optional :root CSS variables. No signup—works in your browser.

Color harmonizer - live palette from one base color

One base color → complementary, triadic, and analogous HEX swatches. Everything updates as you edit.

1 Base color · 2 Optional preset · 3 Swatches & list · 4 Copy results

Your harmony colors

Try #3366CC or #36C. Click a swatch to copy one HEX. Check text pairs in the contrast checker.

Built here. Nothing uploads.

Valid base HEX → swatches and list below.

Next: WCAG contrast · Gradient · Palette · All design tools · All tools

  • Runs in your browser on your device
  • Your base color stays in this tab
  • Free, no account
  • Private by design—same approach across ProToolbox
  • Swatches and list update live

What this is for

For brand accents, UI states, and quick harmony checks from one anchor color. Use contrast tools when text sits on these colors.

  • Brand and theme tweaks
  • HEX lists and --harm-* variables
  • Exploring hue relationships fast
  • Pairing with WCAG checks

Note: A starting point for palettes—not a full design system on its own.

Bookmark when you often need harmony from a single brand color.

Overview

Turn one anchor into a cohesive hue set. Complementary is high contrast on the wheel; triadic balances three accents; analogous keeps things soft for secondary UI. Saturation and lightness track your base so colors feel related.

How it works

  1. Set the base with the picker or HEX (presets optional).
  2. Read the six swatches and the list in the result panel.
  3. Tap Copy results for the HEX list plus --harm-* CSS variables.
  4. Adjust the base, then check contrast elsewhere if you use these with text.

Privacy: Harmony math runs in your browser. We do not receive your colors.

FAQ

  • Figma or Photoshop? Hue relationships match common HSL-style wheels—verify in your tool and on screen.
  • Account? No.
  • Upload? No—stays in this tab until you copy.
  • Mobile? Picker, field, and swatches work on small screens.
  • Production HEX? Yes.

Keep this page open for quick harmony passes.

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