HelloColor

HelloColor turns a single brand color into a complete, accessible design system by generating semantic tokens like backgrounds, surfaces, and status colors in both light and dark modes. It is designed for designers, developers, and founders who need a coherent, WCAG-accessible palette without manually tuning dozens of hex values. The tool uses deterministic OKLCH math to ensure the same inputs always produce the exact same output.

The platform operates on a tiered model where the Pro tier unlocks unlimited palettes, private preset packs, and team sharing capabilities. Users can also track their usage against a monthly quota, with notifications appearing when consumption reaches 82% of the limit. Payment processing is handled directly by the platform, and invoices are generated upon successful settlement.

HelloColor distinguishes itself by using OKLCH, a perceptually uniform color space, rather than HSL or standard hex codes. This approach ensures that changes in lightness appear equally significant to the human eye regardless of hue, allowing for predictable contrast adjustments. The engine builds tonal scales and adjusts contrast based on this mathematical foundation.

Designers, developers, and founders are the primary target audience for this tool. It specifically caters to those who have an existing brand color and require a full UI theme or design system quickly. The app automates the color math required to create a cohesive visual language.

The system includes a dedicated Algorithm Inspector that displays the full pipeline from base hex to final tokens. Every token in the grid provides a plain-language explanation of the exact transform used to generate it. This transparency allows users to see exactly how each color was derived.

Users can customize their palettes using three specific modifiers: Contrast, Vibrancy, and Brightness. Contrast widens or narrows the lightness range, Vibrancy scales chroma, and Brightness shifts the overall lightness. These modifiers are layered on top of the preset parameters.

The tool offers a Preset Builder that allows users to craft their own design philosophies. Presets are categorized into Style (e.g., Startup, Swiss), Movement (e.g., Bauhaus, Nordic), and Harmony (e.g., Complementary, Triadic). Users can select from various harmony styles like Golden Ratio or Analogous.

When accessibility is enabled, the engine automatically corrects foreground lightness until the pairing passes WCAG 2.1 AA (4.5:1) or AAA standards. The token grid displays each color's contrast rating to prevent inaccessible designs from being shipped. This feature ensures compliance with accessibility guidelines.

The platform provides an optional System Audit that reports metrics on contrast, harmony, visual balance, and token consistency. It checks for WCAG compliance, average contrast, and perceptual distance between primary, secondary, and accent colors. This audit helps users verify the quality of their generated systems.

The tool supports exporting generated palettes as design tokens for integration into larger projects. Users can also preview the system in motion and compare different token sets. The interface allows for searching and inspecting operational, degraded, and incident states.

The platform includes a live system view that displays metrics such as revenue, active users, and churn rates. Users can manage their accounts by inviting teammates, rotating API keys, and upgrading to the Pro tier. The interface also allows for searching and managing different operational states.

The official website of HelloColor is hellocolor.de.