ColorUI Prompt Palette Studio

ColorUI Prompt Palette Studio turns natural-language design requests into coordinated color palettes and explains each color’s role. It maps mood, temperature, and context to OKLCH color properties, then assembles primary brand tones, secondary accents, and neutral backgrounds. Users can name colors or enter hex codes, lock those selections, and generate matching tones around them. Exports include CSS variables, Tailwind themes, SCSS, JSON, W3C design tokens, Style Dictionary, Swift UIColor, and Android XML. The public API requires no signup or key, supports CORS, and allows 60 requests per minute. Its endpoint supports prompt-based generation, harmony rules, and random palettes of two to eight colors. The toolkit also includes image color extraction, an accessibility checker, and seven harmony modes. Prompts are processed statelessly and are not stored or associated with personal accounts. Palettes may be used commercially or personally without attribution. ColorUI lists integrations for Figma, VS Code, CLI, GitHub, Raycast, and MCP, and availability for Android, iOS, web, API, extension, and self-hosted use. The free plan costs nothing.

ColorUI combines prompt-based palette creation with explicit color controls and multiple export formats. Its free plan and no-signup API provide ways to use it directly or through listed integrations.

It suits designers and developers who want to generate, adjust, and export palettes for design or development workflows. The API and listed integrations also suit users connecting palette generation to other tools.

Overview

ColorUI Prompt Palette Studio is an AI palette generator for turning written design direction into coordinated colors, with explanations for each choice. It is best suited to designers and developers who want a free, account-free way to move from a brief to usable palette files. Its strongest advantage is the mix of precise color control and broad exports; readers seeking a full design-system workflow should look elsewhere.

ColorUI uses OKLCH properties to interpret a prompt’s mood, temperature, and context, then builds palettes with primary tones, accents, and neutral backgrounds. That makes it more useful as a starting point for a project than a tool that returns a single suggested color. The prompt-based approach also depends on describing the intended look clearly, though users can anchor results with named colors or hex codes.

Prompts are evaluated statelessly through the backend API and are not stored or associated with personal accounts. Generated palettes may be used in personal and commercial work without attribution. For more options, see our AI Color Palette Generators list.

Key features

Users can lock a color name or exact hex value and have matching tones generated around it. This is a practical safeguard for projects with an established brand color: the palette can expand without losing that anchor. Seven harmony modes offer another way to shape results, while random mode accepts counts from two to eight.

Exports include CSS variables, Tailwind, SCSS, JSON, W3C DTCG, Style Dictionary, Swift UIColor, and Android XML. That range serves both interface design and implementation, reducing the need to translate palette values manually. The product also includes image color extraction and an accessibility checker, useful adjacent tools when refining a palette beyond the initial prompt.

ColorUI provides integrations for Figma, VS Code, CLI, GitHub, Raycast, and MCP. Its public API needs no key or signup, supports CORS, and allows 60 requests per minute. The CLI has no dependencies, runs wherever Node 18 or later runs, has no telemetry, and supports self-hosted deployments through COLORUI_API. These options make ColorUI relevant to development workflows as well as one-off palette creation, though the API’s rate limit matters for heavier use.

ColorUI says it uses strict CSP, HSTS preload, COOP, frame-ancestors none, SSRF guards, per-IP rate limits, and weekly CodeQL scans. Support is available by email at [email protected] and through a Discord community.

Pricing

The Free plan costs nothing, billed Free forever. It requires no sign-up or API keys and allows personal and commercial use without attribution. ColorUI also describes its broader toolkit as containing more than 40 free tools with no sign-ups. The no-cost terms make the generator a low-friction fit for individual work and experimentation; there is no paid tier described for teams or higher usage, and API users should account for the 60-requests-per-minute ceiling.

Platforms

ColorUI supports Android, iOS, web, browser extension, API, and self-hosted use. This breadth is useful for people who want to use the same palette workflow across mobile, browser, and development environments rather than remain in a single app.

Who it's for

ColorUI suits designers and developers who need a fast palette draft, want to preserve a chosen brand color, or need exports that slot into code and design tools. Its privacy approach and commercial-use terms also suit people who prefer not to create an account or attach prompts to a personal profile. It is less suited to users who need a managed collaboration or project plan with published team-specific terms.

Pros and cons

• Pros: Free forever with no sign-up, API key, or attribution requirement, so it is easy to use for personal and commercial projects.
• Pros: Named-color and hex locking lets users keep a brand anchor while generating complementary tones.
• Pros: Eight export formats cover common web, design-token, and native-platform needs.
• Pros: Stateless prompt handling and a no-telemetry CLI provide clear privacy characteristics for the generator and CLI workflow.
• Cons: The public API is capped at 60 requests per minute, a constraint for high-volume integrations.
• Cons: No paid plan or team-specific offer is described, so organizations needing defined collaboration terms may need another option.

Alternatives

Pantone Connect Palette Generator is the better fit for readers who want an account-based route into a catalog of more than 15,000 colors, with Search, Pick, and Measure tools; its free plan requires an account.

Coolors is another freemium option, with extension, iOS, and web platforms and a Pro plan at $3 a month billed $3/mo.

Perception offers a free Lite plan with three AI-generated palettes at a time, plus color-reference pages and limited favorites and bookmarks; choose it when those reference features matter more than ColorUI’s broad exports.

AIColors is a free web alternative with unlimited palette generation and no account requirement.

Chromos has a free plan with one project and five palettes, alongside color tools, explanations, advanced reasoning, and ADA optimization; its Pro plan costs $20 a month billed per month.

Color Palette Generator AI offers a free API and web service with unlimited generations, every export format, shareable links, and no account requirement.

ColorBrew is a free option for extension and web use.

Colorfor.ai includes its tools, API, MCP server, widgets, and exports for free, with fair-use limits.

Verdict

Choose ColorUI Prompt Palette Studio if you want a free, no-sign-up palette generator that can preserve a specified brand color and export directly into design and development formats. Its commercial-use permission and no-key API strengthen the case for individual and technical workflows. Look elsewhere if your priority is a defined team plan or a different tool’s particular catalog, reference features, or fair-use model.