Color palette generator: harmonies and shades from one color

$0.01 per call · failed calls are never charged · no account or API key needed

Build a colour palette from one hex colour: complementary, analogous, triadic, split-complementary and tetradic harmonies (hue rotations at the same saturation and lightness), plus six shades from light to dark, all as hex codes, with the base colour's HSL. Use for UI themes, charts, brand kits or slide decks; to check text readability on a colour use color_contrast.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Try it with your own inputs

Base colour as hex, such as #3366ff or 36f

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
color (required)stringBase colour as hex, such as #3366ff or 36f

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/color/palette?color=%233366ff"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/color/palette?color=%233366ff&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "base": "#3366ff",
  "hsl": {
    "h": 225,
    "s": 100,
    "l": 60
  },
  "complementary": [
    "#3366ff",
    "#ffcc33"
  ],
  "analogous": [
    "#33ccff",
    "#3366ff",
    "#6633ff"
  ],
  "triadic": [
    "#3366ff",
    "#ff3366",
    "#66ff33"
  ],
  "splitComplementary": [
    "#3366ff",
    "#ff6633",
    "#ccff33"
  ],
  "tetradic": [
    "#3366ff",
    "#ff33cc",
    "#ffcc33",
    "#33ff66"
  ],
  "shades": [
    "#ccd9ff",
    "#809fff",
    "#3366ff",
    "#0039e6",
    "#002699",
    "#00134d"
  ]
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is color_palette, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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