#51437B
Closest named color: Dark Slate Blue (#483D8B). oklch(42.4% 0.092 293.6), rgb(81, 67, 123).
Aa
White text reads best on this color (8.61:1).
About this color
#51437B is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.092 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 8.61:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.092) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #51437B |
| RGB | rgb(81, 67, 123) |
| HSL | hsl(255, 29%, 37%) |
| OKLCH | oklch(42.4% 0.092 293.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #51437B | 8.61:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #51437B | 2.43:1 | Fails | Lc 14.5 | Not readable |
| #51437B text on white | 8.61:1 | AAA | Lc 89.5 | Fine for body text |
| #51437B text on black | 2.43:1 | Fails | Lc -12.8 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#DAD6EB
oklch(88.6% 0.029 294.5)
-
Step 300
300
#C2BBE1
oklch(81% 0.053 293.6)
-
Step 400
400
#A397D1
oklch(70.8% 0.084 293.6)
-
Step 500
500
#8D7CC5
oklch(63.1% 0.109 293.7)
-
Step 600
600
#7764B2
oklch(55.6% 0.119 293.3)
-
Step 700
700
#645399
oklch(49.1% 0.11 293.1)
-
Step 800
800 (this color)
#51437B
oklch(42.4% 0.092 293.6)
-
Step 900
900
#443A64
oklch(37.9% 0.071 293.7)
-
Step 950
950
#27223A
oklch(26.9% 0.044 292.7)
#51437B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #314C7D | 0.050 |
| Deuteranopia (no green cones) | #334B7A | 0.048 |
| Tritanopia (no blue cones) | #474D59 | 0.074 |
| Achromatopsia (no color) | #4C4C4C | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51437B
#51437B
oklch(42.4% 0.092 293.6)
- #4E5307
#4E5307
oklch(42.4% 0.091 113.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #51437B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Twilight #4E518B ΔE 0.042
- Dusk #4E5481 ΔE 0.047
- Blueberry #464196 ΔE 0.049
- Dusty Grape #545775 ΔE 0.062
- Dusk Blue #26538D ΔE 0.069
- YInMn Blue #415A77 ΔE 0.071
- Cobalt #1E488F ΔE 0.072
Use #51437B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.