data-viz-palette
Generate distinct, accessible colors for charts, graphs, and data visualizations. Uses color harmonies for maximum perceptual distinction.
Full skill instructions
Generate color sets optimized for charts, graphs, and dashboards. Colors are mathematically spaced for maximum distinction and equal visual weight.
npx @basiclines/rampa
Perfect for pie charts, simple bar charts:
rampa -C "<brand-color>" --add=triadic --size=2 -L 50:50 -S 70:70 -O css
Outputs: base, triadic-1, triadic-2 (120° apart)
Good for quarterly data, four-category comparisons:
rampa -C "<brand-color>" --add=square --size=2 -L 50:50 -S 70:70 -O css
Outputs: base, square-1, square-2, square-3 (90° apart)
Alternative with complementary + split for more nuance:
rampa -C "<brand-color>" --add=compound --size=2 -L 50:50 -S 75:75 -O css
Combine triadic with complementary:
rampa -C "<brand-color>" --add=triadic -L 50:50 -S 70:70 --size=2 -O json
# Then run complementary of each triadic color
Or use two interlocking triads at different lightness:
# Primary triad
rampa -C "<brand-color>" --add=triadic --size=2 -L 45:45 -S 70:70 -O css
# Offset triad (shift hue by 60°)
rampa -C "<brand-color>" --add=triadic --size=2 -L 60:60 -S 70:70 -H 60:60 -O css
For brand color #3b82f6:
# 4-color chart palette
rampa -C "#3b82f6" --add=square --size=2 -L 50:50 -S 70:70 -O css
Output:
:root {
--base-0: #3b82f6; /* Blue */
--square-1-0: #a855f7; /* Purple */
--square-2-0: #f97316; /* Orange */
--square-3-0: #22c55e; /* Green */
}
| Background | Recommended Lightness |
|---|---|
| White (#fff) | 45-55% |
| Light gray (#f5f5f5) | 45-55% |
| Dark (#1a1a1a) | 55-65% |
| Black (#000) | 60-70% |
| Use Case | Saturation |
|---|---|
| Bold, attention-grabbing | 75-85% |
| Professional, muted | 55-65% |
| Accessible (colorblind-friendly) | 60-70% |
For colorblind-safe palettes:
Example with lightness variation:
rampa -C "#3b82f6" --add=square --size=1 -L 40:40 -S 70:70 -O css # darker
rampa -C "#3b82f6" --add=square --size=1 -L 60:60 -S 70:70 -O css # lighter
--size=2 gives minimal ramps (2 shades each) - good for data viz
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