#51497B
Closest named color: Dusk (#4E5481). oklch(43.6% 0.081 289.9), rgb(81, 73, 123).
Aa
White text reads best on this color (8.11:1).
About this color
#51497B is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.081 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.031 away. White text reads best on it, at 8.11:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.58:1 |
| White text | 8.11:1 |
Values
| HEX | #51497B |
| RGB | rgb(81, 73, 123) |
| HSL | hsl(250, 26%, 38%) |
| OKLCH | oklch(43.6% 0.081 289.9) |
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 #51497B | 8.11:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #51497B | 2.58:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #51497B text on white | 8.11:1 | AAA | Lc 88.0 | Fine for body text |
| #51497B text on black | 2.58:1 | Fails | Lc -14.1 | 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
#E9E8F3
oklch(93.5% 0.015 290.3)
-
Step 200
200
#D8D7EA
oklch(88.6% 0.026 288.3)
-
Step 300
300
#BFBCDE
oklch(80.9% 0.048 289.3)
-
Step 400
400
#9F99CD
oklch(70.7% 0.075 289.6)
-
Step 500
500
#887FC0
oklch(63% 0.097 289.7)
-
Step 600
600
#7368AD
oklch(55.7% 0.105 289.8)
-
Step 700
700
#605694
oklch(49.1% 0.098 289.7)
-
Step 800
800 (this color)
#51497B
oklch(43.6% 0.081 289.9)
-
Step 900
900
#413B61
oklch(37.6% 0.064 290.2)
-
Step 950
950
#262339
oklch(27% 0.04 289.7)
#51497B 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) | #3A517D | 0.038 |
| Deuteranopia (no green cones) | #3A4F7A | 0.037 |
| Tritanopia (no blue cones) | #47525C | 0.068 |
| Achromatopsia (no color) | #505050 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51497B
#51497B
oklch(43.6% 0.081 289.9)
- #545518
#545518
oklch(43.6% 0.081 110.3)
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 #51497B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.031
- Twilight #4E518B ΔE 0.031
- Dusty Grape #545775 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.049
- YInMn Blue #415A77 ΔE 0.055
- Blueberry #464196 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.060
- Dusk Blue #26538D ΔE 0.061
Use #51497B 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.