#51558E
Closest named color: Twilight (#4E518B). oklch(47.2% 0.092 279.2), rgb(81, 85, 142).
Aa
White text reads best on this color (6.90:1).
About this color
#51558E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.092 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.013 away. White text reads best on it, at 6.90:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.03:1 |
| White text | 6.90:1 |
Values
| HEX | #51558E |
| RGB | rgb(81, 85, 142) |
| HSL | hsl(236, 27%, 44%) |
| OKLCH | oklch(47.2% 0.092 279.2) |
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 #51558E | 6.90:1 | AA | Lc -88.8 | Fine for body text |
| Black text on #51558E | 3.03:1 | AA large text | Lc 20.2 | Dividers and decoration only |
| #51558E text on white | 6.90:1 | AA | Lc 83.8 | Fine for body text |
| #51558E text on black | 3.03:1 | AA large text | Lc -18.2 | 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
#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
#BABEDE
oklch(80.9% 0.045 279.7)
-
Step 400
400
#979CCD
oklch(70.6% 0.072 279.9)
-
Step 500
500
#7E84C0
oklch(63.2% 0.09 279.1)
-
Step 600
600
#676CAC
oklch(55.5% 0.099 279.2)
-
Step 700
700 (this color)
#51558E
oklch(47.2% 0.092 279.2)
-
Step 800
800
#464A78
oklch(42.7% 0.076 278.9)
-
Step 900
900
#3B3E61
oklch(37.7% 0.06 279.4)
-
Step 950
950
#222439
oklch(26.9% 0.039 279.2)
#51558E 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) | #415C90 | 0.027 |
| Deuteranopia (no green cones) | #3D588D | 0.027 |
| Tritanopia (no blue cones) | #3E606A | 0.080 |
| Achromatopsia (no color) | #5A5A5A | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51558E
#51558E
oklch(47.2% 0.092 279.2)
- #685C10
#685C10
oklch(47.3% 0.092 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 #51558E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.013
- Dusk #4E5481 ΔE 0.022
- Dusky Blue #475F94 ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.031
- Dusty Grape #545775 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.046
- Denim #3B638C ΔE 0.047
- YInMn Blue #415A77 ΔE 0.050
Use #51558E 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.