#0A2138
Closest named color: Dark (#1B2431). oklch(24.3% 0.053 250.9), rgb(10, 33, 56).
Aa
White text reads best on this color (16.31:1).
About this color
#0A2138 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.053 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.029 away. White text reads best on it, at 16.31:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.28:1 |
| White text | 16.31:1 |
Values
| HEX | #0A2138 |
| RGB | rgb(10, 33, 56) |
| HSL | hsl(210, 70%, 13%) |
| OKLCH | oklch(24.3% 0.053 250.9) |
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 #0A2138 | 16.31:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #0A2138 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #0A2138 text on white | 16.31:1 | AAA | Lc 103.1 | Preferred for body text |
| #0A2138 text on black | 1.28:1 | 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
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#70A5DD
oklch(70.7% 0.1 250.7)
-
Step 500
500
#488DD4
oklch(63.1% 0.128 251.1)
-
Step 600
600
#2676C1
oklch(55.6% 0.139 250.8)
-
Step 700
700
#1863A7
oklch(49.2% 0.129 250.9)
-
Step 800
800
#175187
oklch(42.8% 0.107 250.7)
-
Step 900
900
#1B436C
oklch(37.6% 0.084 251.5)
-
Step 950
950 (this color)
#0A2138
oklch(24.3% 0.053 250.9)
#0A2138 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) | #172239 | 0.017 |
| Deuteranopia (no green cones) | #101E38 | 0.011 |
| Tritanopia (no blue cones) | #002629 | 0.040 |
| Achromatopsia (no color) | #202020 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A2138
#0A2138
oklch(24.3% 0.053 250.9)
- #2F1B00
#2F1B00
oklch(24.3% 0.052 71.6)
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 #0A2138, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.029
- Oxford Blue #1B263B ΔE 0.030
- Rich Black #0D1B2A ΔE 0.031
- Jet #212529 ΔE 0.047
- Navy Blue #001146 ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.068
- Gunmetal #293241 ΔE 0.076
- Marine #042E60 ΔE 0.079
Use #0A2138 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.