#0A1F2C
Closest named color: Rich Black (#0D1B2A). oklch(22.9% 0.037 238.5), rgb(10, 31, 44).
Aa
White text reads best on this color (16.86:1).
About this color
#0A1F2C is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.037 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 16.86:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.86:1 |
Values
| HEX | #0A1F2C |
| RGB | rgb(10, 31, 44) |
| HSL | hsl(203, 63%, 11%) |
| OKLCH | oklch(22.9% 0.037 238.5) |
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 #0A1F2C | 16.86:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #0A1F2C | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #0A1F2C text on white | 16.86:1 | AAA | Lc 103.7 | Preferred for body text |
| #0A1F2C text on black | 1.24:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A7C5DA
oklch(80.8% 0.044 238.6)
-
Step 400
400
#77A7C8
oklch(70.6% 0.071 239.1)
-
Step 500
500
#5291B9
oklch(63.1% 0.089 238.2)
-
Step 600
600
#337BA6
oklch(55.7% 0.098 238.4)
-
Step 700
700
#25678E
oklch(49% 0.091 238.7)
-
Step 800
800
#215473
oklch(42.6% 0.075 238.8)
-
Step 900
900
#21465D
oklch(37.8% 0.058 238.2)
-
Step 950
950 (this color)
#0A1F2C
oklch(22.9% 0.037 238.5)
#0A1F2C 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) | #191F2D | 0.021 |
| Deuteranopia (no green cones) | #141B2C | 0.018 |
| Tritanopia (no blue cones) | #002223 | 0.026 |
| Achromatopsia (no color) | #1D1D1D | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1F2C
#0A1F2C
oklch(22.9% 0.037 238.5)
- #2A180A
#2A180A
oklch(23% 0.038 57.3)
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 #0A1F2C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.014
- Dark #1B2431 ΔE 0.032
- Jet #212529 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.044
- Rich Navy #001219 ΔE 0.061
- Navy Blue #001146 ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.080
- Almost Black #070D0D ΔE 0.082
Use #0A1F2C 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.