#0A1733
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.058 263.5), rgb(10, 23, 51).
Aa
White text reads best on this color (17.74:1).
About this color
#0A1733 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.058 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.025 away. White text reads best on it, at 17.74:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.74:1 |
Values
| HEX | #0A1733 |
| RGB | rgb(10, 23, 51) |
| HSL | hsl(221, 67%, 12%) |
| OKLCH | oklch(21.1% 0.058 263.5) |
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 #0A1733 | 17.74:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #0A1733 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #0A1733 text on white | 17.74:1 | AAA | Lc 104.4 | Preferred for body text |
| #0A1733 text on black | 1.18:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7DA0E6
oklch(70.8% 0.11 263.5)
-
Step 500
500
#5C86DE
oklch(63% 0.141 263.6)
-
Step 600
600
#436ECC
oklch(55.6% 0.153 263.7)
-
Step 700
700
#345BB0
oklch(48.9% 0.143 263.5)
-
Step 800
800
#2C4B8F
oklch(42.7% 0.118 263.7)
-
Step 900
900
#273F72
oklch(37.6% 0.092 263.6)
-
Step 950
950 (this color)
#0A1733
oklch(21.1% 0.058 263.5)
#0A1733 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) | #091A34 | 0.010 |
| Deuteranopia (no green cones) | #031632 | 0.011 |
| Tritanopia (no blue cones) | #001D22 | 0.047 |
| Achromatopsia (no color) | #181818 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1733
#0A1733
oklch(21.1% 0.058 263.5)
- #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 #0A1733, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.025
- Navy Blue #001146 ΔE 0.044
- Dark #1B2431 ΔE 0.056
- Rich Navy #001219 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.060
- Dark Navy #000435 ΔE 0.064
- Night Blue #040348 ΔE 0.065
- Jet #212529 ΔE 0.071
Use #0A1733 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.