AI color palette generator prompts that give usable palettes

Any capable chat assistant can work as an AI color palette generator, and the difference between a pretty list and a usable palette is the prompt. Ask for five to seven colours, each with a job (ground, text, accent, surface, border), a name and a hex code, and describe a real place or material rather than a style. Then check every pair that will carry text with a contrast checker, because assistants often state contrast ratios they never calculated. The prompts and checks below take about ten minutes.

Why generic palette prompts give generic palettes

"Give me a modern pastel palette" asks the model for the most typical answer to a very common request. You get the same mint, blush and lilac that every free generator offers. Two changes fix most of it: give the colours jobs, and give the assistant something specific to look at in its mind.

A palette prompt you can copy

Create a colour palette for [business, one line] aimed at [audience].
Mood: [three words]. Inspired by: [a real place, material or moment].
Avoid: [colours or clichés you don't want].

Return 6 colours as a table: role, name, hex.
Roles: ground, deep text, light text, main colour, accent (used sparingly), soft surface.
Then say which pairs are meant to carry text.
Do not state contrast ratios; I will check them.

The "inspired by" line does the heavy lifting. "A harbour at six in the morning", "terracotta tiles after rain" or "the inside of an old bookshop" give the model something with real colour relationships, which is why they beat style labels. Colour palette from an image uses the same idea with a photo instead of words.

A worked example

Here is the kind of result to expect from a prompt for a small florist, inspired by "a cold greenhouse in early spring", with the mood words calm, fresh and quietly expensive.

Turn it into a background before judging it. Swatches in a row always look tidy; colours blended together show you whether the family really belongs together or turns muddy where they meet.

How to check palette contrast properly

Language models predict text; they don't calculate. A model may tell you a pair passes when it doesn't. Paste each text pair into a checker such as WebAIM's contrast checker and use the WCAG thresholds.

If a pair fails, ask the assistant a narrow follow up: "Darken the deep text colour until it reaches 4.5:1 on the soft surface, keeping its hue." Then measure again. Colour contrast and accessibility explains the ratios, and colour blindness in design covers pairs that pass contrast but still confuse some readers, such as red and green with similar lightness.

Follow up prompts that improve a palette

• "Give me a light version of this palette that keeps the same character, with the same roles."
• "Which colour here is closest to what my competitors use? Replace it with something that stands apart."
• "Write each colour in oklch() as well as hex, and keep lightness steps even between the greens."
• "Suggest a 60, 30, 10 split for a social post using this palette."
• "Write CSS custom properties for these colours, named by role, not by hue."

The last one is useful if you build for the web: naming by role (--ground, --text-deep) lets you swap the palette later without touching every rule. The 60 30 10 rule explains the split, and OKLCH explained shows why even lightness steps make blends cleaner.

:root {
  --ground: #0f1f1a;
  --text-deep: #1f3b32;
  --main: #4d7c66;
  --accent: #e8a0a8;
  --text-light: #eef2ec;
  --surface-soft: #c9d6cc;
}

Test the palette on real designs

A palette proves itself on a busy feed, not in a chat. Make three real pieces with it: an announcement, a quote and a sale post, at the sizes you actually publish. If the accent starts appearing everywhere, it is no longer an accent.

In Gradiently, palettes live in the brand kit, and a Mark keeps the words readable by itself: its calmest region moves behind the text and Auto ink picks light or dark type per line from the Mark's own colours, so the words stay readable at every size. Colour palette generator covers non AI routes to a palette if you'd rather start by hand.