Huemint
ML palette generator driven by a contrast matrix, with an open POST API
Huemint generates colour schemes with machine learning, but its distinguishing idea is that it generates colours for a layout rather than a flat swatch strip: you give it an adjacency matrix stating the wanted contrast between each pair of roles (0 = any, 1 = none, 100 = black/white) and it returns palettes where each colour already knows whether it is background, foreground or accent. It ships 27 design templates across Brand, Website, Gradient, Gradient + Background, Illustration and Bootstrap, three generation modes (Transformer AI, Diffusion Model AI, Random Creative), a creativity/temperature slider and presets including High Contrast, Pastel, Vibrant and Dark. You can also upload a flat-colour design and have it recoloured. The same engine is reachable at api.huemint.com/color by unauthenticated POST.
This is the colour generator to script against: POST JSON to https://api.huemint.com/color with mode, num_colors, temperature, num_results, palette and a flattened adjacency matrix, and you get back scored palettes — I confirmed it live with no key and no referrer header. Reach for it over ColorMagic or a random palette site whenever the colours must satisfy real constraints (dark surface, readable body text, an accent that pops on both), because encoding those as contrast targets is exactly what the matrix is for; pin known-good colours by passing hex strings in the palette array instead of '-'. Caveats: the API is undocumented and unversioned, there is no stated licence on outputs, and the browser UI is a jQuery app, so drive the endpoint rather than trying to scrape the page.
Why it is here. Almost every other generator hands you five swatches and leaves the hard part — which colour goes where — to you; Huemint models the role and the required contrast up front, which is the actual design problem.
- Brand — 1 Color · Single-colour brand mark on a background
- Brand — 2 Colors · Two-colour brand mark on a background
- Brand — 3 Colors · Three-colour brand mark on a background
- Brand — Intersection · Overlapping shapes where blend regions must also read
- Website — Magazine · Editorial page colouring, text-heavy
- Website — Monochrome · Single-hue web layout
- Website — 1 Accent · Web layout with background, text and one accent
- Website — 2 Accents · Web layout with two accents
- Website — 3 Accents · Web layout with three accents
- Gradient — 2 Colors · Two-stop gradient
- Gradient — 3 Colors · Three-stop gradient
- Gradient — 4 Colors · Four-stop gradient
- Gradient — 5 Colors · Five-stop gradient
- Gradient — 6 Colors · Six-stop gradient
- Gradient — 7 Colors · Seven-stop gradient
- Gradient — 8 Colors · Eight-stop gradient
- Gradient — 9 Colors · Nine-stop gradient
- Gradient — 10 Colors · Ten-stop gradient
- Gradient + Background — 2 Colors · Two-stop gradient plus a separate page background
- Gradient + Background — 3 Colors · Three-stop gradient plus a page background
- Gradient + Background — 4 Colors · Four-stop gradient plus a page background
- Gradient + Background — 5 Colors · Five-stop gradient plus a page background
- Illustration 1 · Flat illustration recolouring, layout one
- Illustration 2 · Flat illustration recolouring, layout two
- Illustration 3 · Flat illustration recolouring, layout three
- Bootstrap — Basic · Core Bootstrap theme colours
- Bootstrap — Plus · Extended Bootstrap theme colours
- contrast adjacency matrix input
- unauthenticated POST API
- 27 layout templates
- transformer and diffusion modes
- colour locking with re-generation
Verified 2026-08-16. HTTP 200. https://huemint.com, https://huemint.com/website-3/ (nav parsed for 27 template URLs), https://huemint.com/about/, live POST to https://api.huemint.com/color (returned scored palettes)
