#0A243A
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.052 247.3), rgb(10, 36, 58).
Aa
White text reads best on this color (15.83:1).
About this color
#0A243A is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.052 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.023 away. White text reads best on it, at 15.83:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.83:1 |
Values
| HEX | #0A243A |
| RGB | rgb(10, 36, 58) |
| HSL | hsl(208, 71%, 13%) |
| OKLCH | oklch(25.3% 0.052 247.3) |
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 #0A243A | 15.83:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #0A243A | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #0A243A text on white | 15.83:1 | AAA | Lc 102.6 | Preferred for body text |
| #0A243A text on black | 1.32:1 | 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
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E7
oklch(80.9% 0.062 247.1)
-
Step 400
400
#6CA6DB
oklch(70.6% 0.099 247.2)
-
Step 500
500
#418FD2
oklch(63.2% 0.127 247.4)
-
Step 600
600
#1878BF
oklch(55.7% 0.138 247.2)
-
Step 700
700
#0564A5
oklch(49% 0.129 247.6)
-
Step 800
800
#0D5285
oklch(42.7% 0.106 247.2)
-
Step 900
900
#16446B
oklch(37.6% 0.083 247.9)
-
Step 950
950 (this color)
#0A243A
oklch(25.3% 0.052 247.3)
#0A243A 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) | #1A253B | 0.020 |
| Deuteranopia (no green cones) | #13203A | 0.016 |
| Tritanopia (no blue cones) | #00292C | 0.038 |
| Achromatopsia (no color) | #222222 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A243A
#0A243A
oklch(25.3% 0.052 247.3)
- #331D02
#331D02
oklch(25.4% 0.053 68.1)
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 #0A243A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.023
- Dark #1B2431 ΔE 0.026
- Rich Black #0D1B2A ΔE 0.039
- Jet #212529 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.067
- Navy Blue #001146 ΔE 0.068
- Marine #042E60 ΔE 0.072
Use #0A243A 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.