#51537D
Closest named color: Dusk (#4E5481). oklch(45.9% 0.068 281.3), rgb(81, 83, 125).
Aa
White text reads best on this color (7.28:1).
About this color
#51537D is a medium-dark, muted purple. In OKLCH its lightness is 46%, its chroma 0.068 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.008 away. White text reads best on it, at 7.28:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #51537D |
| RGB | rgb(81, 83, 125) |
| HSL | hsl(237, 21%, 40%) |
| OKLCH | oklch(45.9% 0.068 281.3) |
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 #51537D | 7.28:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #51537D | 2.88:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #51537D text on white | 7.28:1 | AAA | Lc 85.3 | Fine for body text |
| #51537D text on black | 2.88:1 | Fails | Lc -16.8 | Dividers and decoration only |
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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D6D8E8
oklch(88.5% 0.022 280.3)
-
Step 300
300
#BCBEDA
oklch(80.9% 0.039 282.2)
-
Step 400
400
#999CC8
oklch(70.6% 0.064 281.6)
-
Step 500
500
#8184BA
oklch(63.2% 0.081 281.4)
-
Step 600
600
#6A6DA6
oklch(55.6% 0.088 280.8)
-
Step 700
700
#595B8E
oklch(49.2% 0.081 281.3)
-
Step 800
800 (this color)
#51537D
oklch(45.9% 0.068 281.3)
-
Step 900
900
#3D3E5D
oklch(37.7% 0.053 282.1)
-
Step 950
950
#232537
oklch(27.1% 0.034 279)
#51537D 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) | #46587F | 0.020 |
| Deuteranopia (no green cones) | #44557C | 0.019 |
| Tritanopia (no blue cones) | #455B62 | 0.060 |
| Achromatopsia (no color) | #565656 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51537D
#51537D
oklch(45.9% 0.068 281.3)
- #605929
#605929
oklch(45.9% 0.068 101.1)
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 #51537D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.008
- Dusty Grape #545775 ΔE 0.021
- Twilight #4E518B ΔE 0.026
- YInMn Blue #415A77 ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.044
- Dusky Blue #475F94 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.046
- Denim #3B638C ΔE 0.051
Use #51537D 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.