#51537E
Closest named color: Dusk (#4E5481). oklch(45.9% 0.07 281.2), rgb(81, 83, 126).
Aa
White text reads best on this color (7.27:1).
About this color
#51537E is a medium-dark, muted purple. In OKLCH its lightness is 46%, its chroma 0.070 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.006 away. White text reads best on it, at 7.27:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.88:1 |
| White text | 7.27:1 |
Values
| HEX | #51537E |
| RGB | rgb(81, 83, 126) |
| HSL | hsl(237, 22%, 41%) |
| OKLCH | oklch(45.9% 0.07 281.2) |
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 #51537E | 7.27:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #51537E | 2.88:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #51537E text on white | 7.27:1 | AAA | Lc 85.2 | Fine for body text |
| #51537E 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 700.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D7D8E6
oklch(88.6% 0.019 282.7)
-
Step 300
300
#BCBFD7
oklch(81% 0.034 280)
-
Step 400
400
#9A9DC2
oklch(70.6% 0.054 281.3)
-
Step 500
500
#8285B3
oklch(63.2% 0.069 281.3)
-
Step 600
600
#6B6E9F
oklch(55.6% 0.076 280.9)
-
Step 700
700 (this color)
#51537E
oklch(45.9% 0.07 281.2)
-
Step 800
800
#494B6E
oklch(42.6% 0.058 281.1)
-
Step 900
900
#3D3F59
oklch(37.7% 0.044 280.6)
-
Step 950
950
#242534
oklch(27% 0.028 281.4)
#51537E 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) | #465880 | 0.020 |
| Deuteranopia (no green cones) | #44557D | 0.019 |
| Tritanopia (no blue cones) | #455B63 | 0.060 |
| Achromatopsia (no color) | #575757 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51537E
#51537E
oklch(45.9% 0.07 281.2)
- #605927
#605927
oklch(45.9% 0.07 101.4)
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 #51537E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.006
- Dusty Grape #545775 ΔE 0.022
- Twilight #4E518B ΔE 0.024
- YInMn Blue #415A77 ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.046
- Denim #3B638C ΔE 0.051
Use #51537E 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.