#51539E
Closest named color: Twilight (#4E518B). oklch(47.8% 0.119 279.8), rgb(81, 83, 158).
Aa
White text reads best on this color (6.81:1).
About this color
#51539E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.119 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.031 away. White text reads best on it, at 6.81:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.08:1 |
| White text | 6.81:1 |
Values
| HEX | #51539E |
| RGB | rgb(81, 83, 158) |
| HSL | hsl(238, 32%, 47%) |
| OKLCH | oklch(47.8% 0.119 279.8) |
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 #51539E | 6.81:1 | AA | Lc -88.4 | Fine for body text |
| Black text on #51539E | 3.08:1 | AA large text | Lc 20.7 | Dividers and decoration only |
| #51539E text on white | 6.81:1 | AA | Lc 83.4 | Fine for body text |
| #51539E text on black | 3.08:1 | AA large text | Lc -18.6 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EF
oklch(88.4% 0.033 280)
-
Step 300
300
#B8BDE6
oklch(80.8% 0.058 279.6)
-
Step 400
400
#959AD9
oklch(70.6% 0.092 280.3)
-
Step 500
500
#7C80CF
oklch(63% 0.118 280.2)
-
Step 600
600
#6569BC
oklch(55.6% 0.127 279.3)
-
Step 700
700 (this color)
#51539E
oklch(47.8% 0.119 279.8)
-
Step 800
800
#454783
oklch(42.6% 0.098 279.9)
-
Step 900
900
#3A3C69
oklch(37.7% 0.076 280.1)
-
Step 950
950
#22233E
oklch(26.9% 0.05 280.9)
#51539E 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) | #335EA1 | 0.043 |
| Deuteranopia (no green cones) | #2D589C | 0.044 |
| Tritanopia (no blue cones) | #356371 | 0.103 |
| Achromatopsia (no color) | #5B5B5B | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51539E
#51539E
oklch(47.8% 0.119 279.8)
- #6B5E00
#6B5E00
oklch(48% 0.1 99.9)
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 #51539E, closest first.
No curated palette has a color within ΔE 0.04 of #51539E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.031
- Dusky Blue #475F94 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.042
- Dusk #4E5481 ΔE 0.049
- Blueberry #464196 ΔE 0.053
- Dusk Blue #26538D ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.062
- Denim #3B638C ΔE 0.064
Use #51539E 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.