#0A1331
Closest named color: Rich Black (#0D1B2A). oklch(19.9% 0.061 267.9), rgb(10, 19, 49).
Aa
White text reads best on this color (18.25:1).
About this color
#0A1331 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.061 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.034 away. White text reads best on it, at 18.25:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.25:1 |
Values
| HEX | #0A1331 |
| RGB | rgb(10, 19, 49) |
| HSL | hsl(226, 66%, 12%) |
| OKLCH | oklch(19.9% 0.061 267.9) |
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 #0A1331 | 18.25:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #0A1331 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #0A1331 text on white | 18.25:1 | AAA | Lc 104.8 | Preferred for body text |
| #0A1331 text on black | 1.15:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ACC0F0
oklch(80.9% 0.072 267.1)
-
Step 400
400
#819DE9
oklch(70.6% 0.116 268)
-
Step 500
500
#6383E2
oklch(63% 0.148 268)
-
Step 600
600
#4B6BD0
oklch(55.7% 0.16 267.7)
-
Step 700
700
#3D58B4
oklch(49% 0.149 268.2)
-
Step 800
800
#324992
oklch(42.8% 0.123 267.8)
-
Step 900
900
#2C3E74
oklch(37.8% 0.095 267.8)
-
Step 950
950 (this color)
#0A1331
oklch(19.9% 0.061 267.9)
#0A1331 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) | #031732 | 0.015 |
| Deuteranopia (no green cones) | #001330 | 0.016 |
| Tritanopia (no blue cones) | #001A1F | 0.051 |
| Achromatopsia (no color) | #151515 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1331
#0A1331
oklch(19.9% 0.061 267.9)
- #1D1400
#1D1400
oklch(19.7% 0.04 87.9)
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 #0A1331, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.034
- Navy Blue #001146 ΔE 0.043
- Dark Navy #000435 ΔE 0.052
- Rich Navy #001219 ΔE 0.054
- Night Blue #040348 ΔE 0.059
- Midnight #03012D ΔE 0.063
- Dark Navy Blue #00022E ΔE 0.063
- Very Dark Blue #000133 ΔE 0.063
Use #0A1331 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.