#51598B
Closest named color: Dusk (#4E5481). oklch(47.9% 0.081 276), rgb(81, 89, 139).
Aa
White text reads best on this color (6.66:1).
About this color
#51598B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.081 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.020 away. White text reads best on it, at 6.66:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.15:1 |
| White text | 6.66:1 |
Values
| HEX | #51598B |
| RGB | rgb(81, 89, 139) |
| HSL | hsl(232, 26%, 43%) |
| OKLCH | oklch(47.9% 0.081 276) |
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 #51598B | 6.66:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #51598B | 3.15:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #51598B text on white | 6.66:1 | AA | Lc 82.9 | Fine for body text |
| #51598B text on black | 3.15:1 | AA large text | Lc -19.1 | 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
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D5D8E8
oklch(88.5% 0.022 277.5)
-
Step 300
300
#B9BFDB
oklch(80.9% 0.04 275.9)
-
Step 400
400
#959EC8
oklch(70.7% 0.062 275.3)
-
Step 500
500
#7C85BA
oklch(63% 0.081 276.4)
-
Step 600
600
#656FA6
oklch(55.7% 0.086 275.4)
-
Step 700
700 (this color)
#51598B
oklch(47.9% 0.081 276)
-
Step 800
800
#454C74
oklch(42.8% 0.067 275.6)
-
Step 900
900
#3A3F5D
oklch(37.7% 0.052 276.3)
-
Step 950
950
#222537
oklch(27% 0.034 276.6)
#51598B 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) | #485F8D | 0.019 |
| Deuteranopia (no green cones) | #445A8A | 0.018 |
| Tritanopia (no blue cones) | #3F636B | 0.072 |
| Achromatopsia (no color) | #5C5C5C | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51598B
#51598B
oklch(47.9% 0.081 276)
- #6B5D20
#6B5D20
oklch(47.9% 0.082 96.2)
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 #51598B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.020
- Dusky Blue #475F94 ΔE 0.022
- Twilight #4E518B ΔE 0.024
- Denim Blue #3B5B92 ΔE 0.029
- Dusty Grape #545775 ΔE 0.035
- Denim #3B638C ΔE 0.037
- YInMn Blue #415A77 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.043
Use #51598B 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.