#51528B
Closest named color: Twilight (#4E518B). oklch(46.4% 0.092 281.5), rgb(81, 82, 139).
Aa
White text reads best on this color (7.16:1).
About this color
#51528B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 46%, its chroma 0.092 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.006 away. White text reads best on it, at 7.16:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.92:1 |
| White text | 7.16:1 |
Values
| HEX | #51528B |
| RGB | rgb(81, 82, 139) |
| HSL | hsl(239, 26%, 43%) |
| OKLCH | oklch(46.4% 0.092 281.5) |
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 #51528B | 7.16:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #51528B | 2.92:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #51528B text on white | 7.16:1 | AAA | Lc 84.8 | Fine for body text |
| #51528B text on black | 2.92:1 | Fails | Lc -17.2 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D6D8EA
oklch(88.6% 0.025 280.8)
-
Step 300
300
#BBBEDD
oklch(80.9% 0.044 281)
-
Step 400
400
#999CCC
oklch(70.8% 0.07 281.7)
-
Step 500
500
#8083BF
oklch(63.1% 0.09 281.3)
-
Step 600
600
#6A6CAC
oklch(55.7% 0.099 281.3)
-
Step 700
700 (this color)
#51528B
oklch(46.4% 0.092 281.5)
-
Step 800
800
#484977
oklch(42.6% 0.076 281.7)
-
Step 900
900
#3C3E60
oklch(37.8% 0.058 280.7)
-
Step 950
950
#232438
oklch(26.9% 0.037 281.4)
#51528B 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) | #3E5A8D | 0.032 |
| Deuteranopia (no green cones) | #3B568A | 0.031 |
| Tritanopia (no blue cones) | #405D68 | 0.078 |
| Achromatopsia (no color) | #585858 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51528B
#51528B
oklch(46.4% 0.092 281.5)
- #645A0D
#645A0D
oklch(46.3% 0.091 101.3)
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 #51528B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.006
- Dusk #4E5481 ΔE 0.019
- Denim Blue #3B5B92 ΔE 0.036
- Dusky Blue #475F94 ΔE 0.037
- Dusty Grape #545775 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.048
- YInMn Blue #415A77 ΔE 0.050
- Dusk Blue #26538D ΔE 0.052
Use #51528B 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.