Playground
Two colors, five metrics, one arc
Change either color to recompute AxiomLab, HelmLab and the standard metrics in your browser. Color A also seeds the page theme — generated in AxiomLab LCh, not HCT. Gradients are generated live along each space's own interpolation path.
AxiomLab coordinates of A
L 0.3956 · a -0.1335 · b -0.3844L
0.396
C
0.407
h°
250.9
Color difference
lower = more similar- AxiomLab — Power-Riemannian 0.8227
- AxiomLab — Homogeneous ds 0.7881
- HelmLab MetricSpace 0.1483
- CIEDE2000 64.2339
- OKLab (Euclidean) 0.6312
- CIE76 149.9606
The six columns use different units and scales. HelmLab's trained distance saturates near 0.15, so compare rankings within one metric — not raw magnitudes across metrics.
Gradient paths
Same endpoints, four interpolation strategies. Equal hex steps are shown; perceptual spacing differs.
AxiomLab
Riemannian arc-length
HelmLab
GenSpace + CIEDE2000 arc-length
OKLab
linear Lab interpolation
Linear sRGB
gamma-encoded interpolation
The blue→white test
Naive RGB and some Lab paths drift through lavender. AxiomLab bends the blue region toward a sky-blue midpoint (#88a7e6); HelmLab lands at #629eff.