#25283B
Closest named color: Oxford Blue (#1B263B). oklch(28.3% 0.035 277), rgb(37, 40, 59).
Aa
White text reads best on this color (14.52:1).
About this color
#25283B is a dark, muted blue. In OKLCH its lightness is 28%, its chroma 0.035 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.018 away. White text reads best on it, at 14.52:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.44:1 |
| White text | 14.52:1 |
Values
| HEX | #25283B |
| RGB | rgb(37, 40, 59) |
| HSL | hsl(232, 23%, 19%) |
| OKLCH | oklch(28.3% 0.035 277) |
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 #25283B | 14.52:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #25283B | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #25283B text on white | 14.52:1 | AAA | Lc 101.3 | Preferred for body text |
| #25283B text on black | 1.44:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D5D8E9
oklch(88.5% 0.023 277.9)
-
Step 300
300
#B9BFDC
oklch(80.9% 0.041 276.2)
-
Step 400
400
#969DCB
oklch(70.7% 0.068 277.8)
-
Step 500
500
#7C85BD
oklch(63.1% 0.085 276.7)
-
Step 600
600
#666EA9
oklch(55.7% 0.092 277.1)
-
Step 700
700
#545C91
oklch(49.2% 0.085 276.3)
-
Step 800
800
#454B76
oklch(42.7% 0.072 276.9)
-
Step 900
900
#3A3F5F
oklch(37.8% 0.055 276.6)
-
Step 950
950 (this color)
#25283B
oklch(28.3% 0.035 277)
#25283B 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) | #222A3C | 0.008 |
| Deuteranopia (no green cones) | #21283B | 0.007 |
| Tritanopia (no blue cones) | #1F2C2F | 0.032 |
| Achromatopsia (no color) | #292929 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25283B
#25283B
oklch(28.3% 0.035 277)
- #2E2A15
#2E2A15
oklch(28.3% 0.035 98.8)
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 #25283B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.018
- Space Cadet #2B2D42 ΔE 0.022
- Dark #1B2431 ΔE 0.028
- Gunmetal #293241 ΔE 0.034
- Jet #212529 ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.063
- Midnight Green #073B4C ΔE 0.065
Use #25283B 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.