#252E57
Closest named color: Prussian Blue (#1D3557). oklch(31.6% 0.074 272.2), rgb(37, 46, 87).
Aa
White text reads best on this color (13.06:1).
About this color
#252E57 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.074 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.023 away. White text reads best on it, at 13.06:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.60:1 |
| White text | 13.06:1 |
Values
| HEX | #252E57 |
| RGB | rgb(37, 46, 87) |
| HSL | hsl(229, 40%, 24%) |
| OKLCH | oklch(31.6% 0.074 272.2) |
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 #252E57 | 13.06:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #252E57 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #252E57 text on white | 13.06:1 | AAA | Lc 99.2 | Preferred for body text |
| #252E57 text on black | 1.60:1 | Fails | Lc 0.0 | Not readable |
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 950.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#ADBEFA
oklch(81% 0.087 272.1)
-
Step 400
400
#8399F8
oklch(70.7% 0.141 272.5)
-
Step 500
500
#667DF4
oklch(63.2% 0.179 272.1)
-
Step 600
600
#5062E3
oklch(55.6% 0.195 272.4)
-
Step 700
700
#4150C5
oklch(49% 0.181 272.3)
-
Step 800
800
#35439F
oklch(42.7% 0.149 272)
-
Step 900
900
#2E397F
oklch(37.7% 0.118 272.7)
-
Step 950
950 (this color)
#252E57
oklch(31.6% 0.074 272.2)
#252E57 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) | #1D3359 | 0.017 |
| Deuteranopia (no green cones) | #172F56 | 0.018 |
| Tritanopia (no blue cones) | #0D373E | 0.066 |
| Achromatopsia (no color) | #313131 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #252E57
#252E57
oklch(31.6% 0.074 272.2)
- #3D3000
#3D3000
oklch(31.5% 0.064 92.4)
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 #252E57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.023
- Marine #042E60 ΔE 0.036
- Space Cadet #2B2D42 ΔE 0.038
- Gunmetal #293241 ΔE 0.045
- Marine Blue #01386A ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.050
- Midnight Green #073B4C ΔE 0.056
- Oxford Blue #1B263B ΔE 0.057
Use #252E57 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.