How to Use This Tool
Distribute hues, preview labeled swatches and expose the closest RGB pair. Generate a deterministic categorical chart palette, preview labeled colors, measure the closest pair, and export CSS variables or CSV locally.
The work this page finishes
Choosing adjacent hues by eye makes categorical series merge, while random colors are difficult to reproduce when a chart is regenerated. For Chart Palette Generator, the row-preserving workspace makes a correction repeatable without rebuilding a prompt or transmitting the source file.
Deterministic workflow
Advance hue by the golden angle at fixed editable saturation and lightness, convert HSL to sRGB and report the smallest pairwise Euclidean RGB distance. For Chart Palette Generator, this page accepts at most 5,000 records and 2 MB of text; rejected items retain their row references while valid items remain available.
Why a dedicated interface helps
Use labels, shapes or patterns in addition to color and test the final chart with its real background, size and audience. For Chart Palette Generator, immediate recalculation and a stable export are useful when the same rule must be applied consistently across a list instead of explained one item at a time.
Assumptions
- Categories are nominal rather than ordered.
- The same inputs must reproduce the same assignments.
- Color is not the only carrier of meaning.
For Chart Palette Generator, retain the original source until the destination accepts the result; processing stays in this tab, although the device and installed extensions remain part of the user's security boundary.
Limitations and review boundary
RGB distance is a simple screening metric, not a perceptual uniformity or color-vision guarantee, and fixed lightness may not meet text contrast requirements. For Chart Palette Generator, no supplied URL is requested and no pasted markup or code is executed; output is inserted through text-only DOM operations.
Verification and provenance
The implementation was checked against W3C CSS Color Module Level 4 on 2026-08-26, with fixtures for a known answer, an invalid input and a batch-specific edge condition. Eight categories produce eight stable hexadecimal colors and identify the closest pair for focused visual review.
Sources & assumptions
Tool Spec v2 · verified 2026-08-26. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- W3C CSS Color Module Level 4 (checked 2026-08-26)
Model assumptions
- Categories are nominal rather than ordered.
- The same inputs must reproduce the same assignments.
- Color is not the only carrier of meaning.
- RGB distance is a simple screening metric, not a perceptual uniformity or color-vision guarantee, and fixed lightness may not meet text contrast requirements.
