#253B66
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.08 262.6), rgb(37, 59, 102).
Aa
White text reads best on this color (11.07:1).
About this color
#253B66 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.080 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.032 away. White text reads best on it, at 11.07:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.89:1 |
| White text | 11.07:1 |
Values
| HEX | #253B66 |
| RGB | rgb(37, 59, 102) |
| HSL | hsl(220, 47%, 27%) |
| OKLCH | oklch(35.7% 0.08 262.6) |
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 #253B66 | 11.07:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #253B66 | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #253B66 text on white | 11.07:1 | AAA | Lc 95.4 | Preferred for body text |
| #253B66 text on black | 1.89:1 | 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 900.
-
Step 50
50
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ACC1E8
oklch(80.8% 0.06 262.8)
-
Step 400
400
#80A1DD
oklch(70.8% 0.096 262)
-
Step 500
500
#6188D3
oklch(63.1% 0.122 262.6)
-
Step 600
600
#4870C1
oklch(55.6% 0.134 263)
-
Step 700
700
#395EA6
oklch(49.2% 0.123 262.3)
-
Step 800
800
#2F4D87
oklch(42.7% 0.103 262.3)
-
Step 900
900 (this color)
#253B66
oklch(35.7% 0.08 262.6)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#253B66 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) | #283F68 | 0.013 |
| Deuteranopia (no green cones) | #203965 | 0.009 |
| Tritanopia (no blue cones) | #00454B | 0.070 |
| Achromatopsia (no color) | #3C3C3C | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #253B66
#253B66
oklch(35.7% 0.08 262.6)
- #4F3800
#4F3800
oklch(35.7% 0.073 82.8)
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 #253B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.046
- Charcoal #264653 ΔE 0.055
- Marine #042E60 ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
Use #253B66 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.