#51548D
Closest named color: Twilight (#4E518B). oklch(47% 0.092 280), rgb(81, 84, 141).
Aa
White text reads best on this color (6.99:1).
About this color
#51548D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.092 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.010 away. White text reads best on it, at 6.99:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.00:1 |
| White text | 6.99:1 |
Values
| HEX | #51548D |
| RGB | rgb(81, 84, 141) |
| HSL | hsl(237, 27%, 44%) |
| OKLCH | oklch(47% 0.092 280) |
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 #51548D | 6.99:1 | AA | Lc -89.1 | Fine for body text |
| Black text on #51548D | 3.00:1 | AA large text | Lc 19.9 | Dividers and decoration only |
| #51548D text on white | 6.99:1 | AA | Lc 84.1 | Fine for body text |
| #51548D text on black | 3.00:1 | AA large text | Lc -17.8 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F3
oklch(93.6% 0.013 281.6)
-
Step 200
200
#D5D8EA
oklch(88.5% 0.025 278.3)
-
Step 300
300
#BABEDD
oklch(80.8% 0.044 279.6)
-
Step 400
400
#979CCD
oklch(70.6% 0.072 279.9)
-
Step 500
500
#7E83C0
oklch(63% 0.092 279.8)
-
Step 600
600
#686CAC
oklch(55.6% 0.099 279.9)
-
Step 700
700 (this color)
#51548D
oklch(47% 0.092 280)
-
Step 800
800
#474A78
oklch(42.8% 0.076 279.8)
-
Step 900
900
#3B3E60
oklch(37.7% 0.058 279.3)
-
Step 950
950
#232439
oklch(27% 0.039 281.4)
#51548D 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) | #405B8F | 0.028 |
| Deuteranopia (no green cones) | #3C578C | 0.029 |
| Tritanopia (no blue cones) | #3E5F69 | 0.080 |
| Achromatopsia (no color) | #595959 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51548D
#51548D
oklch(47% 0.092 280)
- #675B0F
#675B0F
oklch(46.9% 0.091 99.6)
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 #51548D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.010
- Dusk #4E5481 ΔE 0.021
- Dusky Blue #475F94 ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.032
- Dusty Grape #545775 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.046
- Denim #3B638C ΔE 0.049
- YInMn Blue #415A77 ΔE 0.050
Use #51548D 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.