Colormind API

Free AI colour palette API with no key: generate harmonious five-colour palettes, or lock colours and let the model complete the rest. Tested POST example.

No API key requiredCORS enabledFree tier

Endpoint tested and returned HTTP 200 on 20 Aug 2026

What is the Colormind API?

Colormind is a free, key-free API that generates harmonious five-colour palettes using a deep learning model, and can complete a palette around colours you lock in place.

Colormind is trained on photographs, films and popular palettes rather than applying colour-wheel rules, which is why its output tends to look designed rather than mechanically derived.

Palette completion is the genuinely useful feature: pass your brand colour with the remaining slots as `"N"` and the model fills the rest around it. That solves the real problem — building a palette that works with a colour you are already committed to.

Quick facts

Base URL: http://colormind.io/api/
Authentication: No API key required.
Rate limit: No published limit; the maintainer asks for reasonable use.
Pricing: Free.
CORS: Enabled — callable directly from browser JavaScript
Official docs: Read the docs

How to use the Colormind API

Every request below was executed against the live API on 20 Aug 2026, and the response shown is the real body it returned — not an illustration.

1. Generate a colour palette

POST http://colormind.io/api/

curl

curl -X POST 'http://colormind.io/api/' \
  -H 'Content-Type: application/json' \
  -d '{"model":"default"}'

JavaScript (fetch)

const res = await fetch("http://colormind.io/api/", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"model":"default"}),
});
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

Python (requests)

import requests

headers = {
    "Content-Type": "application/json",
}

payload = {"model":"default"}

res = requests.post("http://colormind.io/api/", headers=headers, json=payload, timeout=20)
res.raise_for_status()
print(res.json())

Response — HTTP 200

{
  "result": [
    [
      187,
      173,
      81
    ],
    [
      198,
      109,
      65
    ],
    [
      80,
      58,
      32
    ],
    [
      99,
      64,
      33
    ],
    [
      156,
      44,
      16
    ]
  ]
}

Parameters

Parameter	Type	Required	Description
`model`	string	Required	Which trained model to use, in the POST body. `default`
`input`	array	Optional	Five slots; RGB arrays to lock, or "N" to let the model choose. `[[44,43,44],"N","N","N","N"]`
`(list models)`	path	Optional	POST to /list to see available models. `list`

Response fields

resultarray: Five RGB colour arrays, each [r, g, b] with values 0-255.

What you can build with the Colormind API

Generate a brand palette around an existing colour
Offer palette suggestions in a design tool
Create varied colour schemes for data visualisation
Seed mockups with harmonious colours rather than random ones

Common errors and how to fix them

Returns RGB arrays, not hex

Output is [r,g,b] triples.

Fix: Convert to hex yourself; the API never returns hex strings.

HTTP not HTTPS

The API is served over plain HTTP.

Fix: Call it server-side; browsers block it as mixed content from an HTTPS page.

Input must have exactly five slots

The model expects a five-element array.

Fix: Use "N" as a placeholder for each colour you want generated.

Colormind API — frequently asked questions

Is Colormind free?

Yes, free with no API key. The maintainer asks for reasonable use.

How do I build a palette around my brand colour?

Pass it as an RGB array in the input, with "N" in the remaining slots. The model completes the palette around your fixed colour.

Why is the output RGB rather than hex?

The model works in RGB space and returns [r,g,b] triples. Convert to hex in your own code.

Can I call it from the browser?

Not directly on an HTTPS page — it is served over plain HTTP, which browsers block as mixed content. Proxy it through your server.

Tools that pair with this API

Color Picker

Pick any color and get its HEX, RGB and HSL values instantly. Free online color picker with shades, tints and one-click copy for designers and developers.

RGB to HEX Converter

Convert RGB or RGBA values to HEX color codes instantly. Enter channels manually or paste an rgb() string, preview the swatch and copy the HEX result.

Color Palette Generator

Generate complementary, analogous, triadic, tetradic and monochromatic color palettes from any base color. Click any swatch to copy its HEX code fast.

Alternatives to Colormind API

If Colormind does not fit, these utility apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.

API	What it does	Auth	CORS	Last verified
Agify	Free API that estimates age from a first name using public name data. No key for 100 requests/day. Tested curl example, live response and accuracy caveats.	No key	Yes	19 Aug 2026
Genderize	Free API estimating the gender statistically associated with a first name, with a probability score. 100 requests/day, no key. Tested example and caveats.	No key	Yes	19 Aug 2026
Nationalize	Free API predicting likely nationality from a first name, returning ranked countries with probabilities. 100 requests/day, no key. Tested curl example.	No key	Yes	19 Aug 2026
Random User Generator	Free random user generator API with no key: names, addresses, emails, photos and logins in multiple nationalities. Seeded and reproducible. Tested example.	No key	Yes	19 Aug 2026
DigiDates	Free date utility API with no key: validate dates, compute age, week numbers, leap years, Unix timestamps and progress through a period. Tested example included.	No key	Yes	21 Aug 2026
Hebcal	Free Hebrew calendar API with no key: convert Gregorian to Hebrew dates and back, plus Jewish holidays, Shabbat times, Torah portions and yahrzeit calculations. Tested example included.	No key	Yes	21 Aug 2026

All Utility APIs

Colormind is an independent third-party service and is not affiliated with ByteTools or ByteVancer. Details on this page were verified on 20 Aug 2026; always check the official documentation before relying on this API in production, as terms and limits can change.