#252B5B
Closest named color: Prussian Blue (#1D3557). oklch(31.2% 0.085 275), rgb(37, 43, 91).
Aa
White text reads best on this color (13.33:1).
About this color
#252B5B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.085 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.033 away. White text reads best on it, at 13.33:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.57:1 |
| White text | 13.33:1 |
Values
| HEX | #252B5B |
| RGB | rgb(37, 43, 91) |
| HSL | hsl(233, 42%, 25%) |
| OKLCH | oklch(31.2% 0.085 275) |
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 #252B5B | 13.33:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #252B5B | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #252B5B text on white | 13.33:1 | AAA | Lc 99.6 | Preferred for body text |
| #252B5B text on black | 1.57:1 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500
#6A77FF
oklch(63% 0.2 275)
-
Step 600
600
#5559F3
oklch(55.6% 0.225 275.1)
-
Step 700
700
#4648D3
oklch(49.1% 0.208 275)
-
Step 800
800
#393CAB
oklch(42.7% 0.173 275.1)
-
Step 900
900
#303587
oklch(37.6% 0.135 275.2)
-
Step 950
950 (this color)
#252B5B
oklch(31.2% 0.085 275)
#252B5B 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) | #14325D | 0.027 |
| Deuteranopia (no green cones) | #0C2D5A | 0.029 |
| Tritanopia (no blue cones) | #09363E | 0.076 |
| Achromatopsia (no color) | #2F2F2F | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #252B5B
#252B5B
oklch(31.2% 0.085 275)
- #3B3000
#3B3000
oklch(31.2% 0.064 95.1)
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 #252B5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.033
- Marine #042E60 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.048
- Marine Blue #01386A ΔE 0.049
- Gunmetal #293241 ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.062
- Oxford Blue #1B263B ΔE 0.062
- Midnight Blue #191970 ΔE 0.063
Use #252B5B 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.