#0A2239
Closest named color: Oxford Blue (#1B263B). oklch(24.6% 0.053 250.1), rgb(10, 34, 57).
Aa
White text reads best on this color (16.14:1).
About this color
#0A2239 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.053 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.027 away. White text reads best on it, at 16.14:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.14:1 |
Values
| HEX | #0A2239 |
| RGB | rgb(10, 34, 57) |
| HSL | hsl(209, 70%, 13%) |
| OKLCH | oklch(24.6% 0.053 250.1) |
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 #0A2239 | 16.14:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #0A2239 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #0A2239 text on white | 16.14:1 | AAA | Lc 102.9 | Preferred for body text |
| #0A2239 text on black | 1.30:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF0
oklch(88.4% 0.036 250.9)
-
Step 300
300
#A2C4E8
oklch(80.8% 0.063 250.1)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500
#458ED4
oklch(63.2% 0.129 249.7)
-
Step 600
600
#2276C1
oklch(55.5% 0.14 250.2)
-
Step 700
700
#1363A7
oklch(49.1% 0.13 250.2)
-
Step 800
800
#145187
oklch(42.7% 0.108 250.1)
-
Step 900
900
#19446C
oklch(37.8% 0.083 249.6)
-
Step 950
950 (this color)
#0A2239
oklch(24.6% 0.053 250.1)
#0A2239 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) | #18233A | 0.018 |
| Deuteranopia (no green cones) | #111F39 | 0.012 |
| Tritanopia (no blue cones) | #00272A | 0.040 |
| Achromatopsia (no color) | #212121 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A2239
#0A2239
oklch(24.6% 0.053 250.1)
- #311B00
#311B00
oklch(24.6% 0.054 68.7)
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 #0A2239, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.027
- Dark #1B2431 ΔE 0.028
- Rich Black #0D1B2A ΔE 0.034
- Jet #212529 ΔE 0.046
- Navy Blue #001146 ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.065
- Gunmetal #293241 ΔE 0.073
- Marine #042E60 ΔE 0.076
Use #0A2239 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.