#0A1731
Closest named color: Rich Black (#0D1B2A). oklch(21% 0.055 262.6), rgb(10, 23, 49).
Aa
White text reads best on this color (17.79:1).
About this color
#0A1731 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.055 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.023 away. White text reads best on it, at 17.79:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.17:1 |
| White text | 17.79:1 |
Values
| HEX | #0A1731 |
| RGB | rgb(10, 23, 49) |
| HSL | hsl(220, 66%, 12%) |
| OKLCH | oklch(21% 0.055 262.6) |
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 #0A1731 | 17.79:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #0A1731 | 1.17:1 | Fails | Lc 0.0 | Not readable |
| #0A1731 text on white | 17.79:1 | AAA | Lc 104.5 | Preferred for body text |
| #0A1731 text on black | 1.17:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#AAC1EB
oklch(80.8% 0.065 262.4)
-
Step 400
400
#7EA0E2
oklch(70.7% 0.104 263.1)
-
Step 500
500
#5D87D9
oklch(63% 0.133 262.7)
-
Step 600
600
#446FC7
oklch(55.5% 0.145 262.9)
-
Step 700
700
#365DAC
oklch(49.2% 0.134 262.7)
-
Step 800
800
#2D4C8B
oklch(42.7% 0.111 262.9)
-
Step 900
900
#28406F
oklch(37.7% 0.086 262.6)
-
Step 950
950 (this color)
#0A1731
oklch(21% 0.055 262.6)
#0A1731 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) | #0B1A32 | 0.011 |
| Deuteranopia (no green cones) | #051630 | 0.008 |
| Tritanopia (no blue cones) | #001D21 | 0.045 |
| Achromatopsia (no color) | #181818 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1731
#0A1731
oklch(21% 0.055 262.6)
- #221600
#221600
oklch(21% 0.043 82.5)
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 #0A1731, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.023
- Navy Blue #001146 ΔE 0.047
- Rich Navy #001219 ΔE 0.055
- Dark #1B2431 ΔE 0.055
- Oxford Blue #1B263B ΔE 0.061
- Dark Navy #000435 ΔE 0.064
- Night Blue #040348 ΔE 0.068
- Jet #212529 ΔE 0.070
Use #0A1731 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.