Chroma.js
Powerful JavaScript color manipulation library. Chroma.js handles color parsing (hex, RGB, HSL, HSV, LAB, LCH, OKLCH), conversion between color spaces, color mixing, brewer scales for data visualization, and perceptually uniform color interpolation. Used in data visualization (Observable, D3), design tools, and agent UIs that need sophisticated color manipulation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Local color manipulation — no network calls, no user data. No security concerns beyond keeping dependencies updated.
⚡ Reliability
Best When
Building data visualizations or UI themes in JavaScript that need perceptually correct color manipulation and pre-built ColorBrewer palettes.
Avoid When
You only need simple hex-to-RGB conversion — native CSS or simple regex is sufficient without a full library.
Use Cases
- • Generate perceptually uniform color scales for agent data visualizations and dashboards using chroma.scale() with ColorBrewer palettes
- • Convert between color spaces in agent UI themes — hex to RGB to HSL for programmatic color manipulation
- • Create accessible color palettes by checking contrast ratios and adjusting lightness in the LAB/OKLCH color space
- • Interpolate between colors for agent chart gradients using chroma's bezier interpolation for smooth perceptual transitions
- • Generate categorical color schemes for multi-series agent charts using ColorBrewer presets optimized for color-blind users
Not For
- • CSS preprocessing — use Sass/Less color functions for CSS build-time color manipulation; Chroma.js is for runtime JavaScript
- • Color picker UI components — use react-colorful or spectrum for color picker inputs; Chroma.js is for programmatic manipulation
- • Server-side performance-critical color processing at scale — Chroma.js is accurate but not the fastest; pure math implementations may be faster
Interface
Authentication
No authentication — local color manipulation library.
Pricing
Chroma.js is open source and free.
Agent Metadata
Known Gotchas
- ⚠ Chroma.js 3.x is ESM-only — require('chroma-js') fails in CJS; stay on 2.x for CommonJS or migrate to ESM
- ⚠ Color space conversions (e.g., lab to rgb) can produce out-of-gamut values — check that .rgb() values are in 0-255 range before use; clamp() is available
- ⚠ chroma.scale() domain defaults to [0,1] — set .domain([min, max]) explicitly when mapping data values to colors; wrong domain produces off-scale colors
- ⚠ ColorBrewer palettes are included in Chroma.js but are copyrighted — attribution required when using them in commercial products
- ⚠ OKLCH and OKLAB support was added in 2.x — older documentation and StackOverflow answers may use LAB where OKLCH would be more perceptually accurate
- ⚠ chroma() constructor silently creates invalid colors from unrecognized strings — always validate input or use try/catch around chroma(userInput)
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Chroma.js.
Scores are editorial opinions as of 2026-03-06.