#0A1820
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.025 235), rgb(10, 24, 32).
Aa
White text reads best on this color (18.03:1).
About this color
#0A1820 is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 18.03:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.03:1 |
Values
| HEX | #0A1820 |
| RGB | rgb(10, 24, 32) |
| HSL | hsl(202, 52%, 8%) |
| OKLCH | oklch(20.1% 0.025 235) |
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 #0A1820 | 18.03:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #0A1820 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #0A1820 text on white | 18.03:1 | AAA | Lc 104.7 | Preferred for body text |
| #0A1820 text on black | 1.16:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AFC4D1
oklch(80.9% 0.029 234.9)
-
Step 400
400
#84A6BB
oklch(70.7% 0.048 235.5)
-
Step 500
500
#6490AA
oklch(63.1% 0.062 235)
-
Step 600
600
#4B7A95
oklch(55.7% 0.066 234.9)
-
Step 700
700
#3C667F
oklch(49% 0.062 236.1)
-
Step 800
800
#325467
oklch(42.8% 0.051 234.2)
-
Step 900
900
#2C4554
oklch(37.7% 0.04 235.6)
-
Step 950
950 (this color)
#0A1820
oklch(20.1% 0.025 235)
#0A1820 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) | #141820 | 0.016 |
| Deuteranopia (no green cones) | #111520 | 0.015 |
| Tritanopia (no blue cones) | #021A1B | 0.018 |
| Achromatopsia (no color) | #161616 | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1820
#0A1820
oklch(20.1% 0.025 235)
- #1F130B
#1F130B
oklch(20% 0.025 54.5)
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 #0A1820, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Rich Navy #001219 ΔE 0.033
- Almost Black #070D0D ΔE 0.052
- Dark #1B2431 ΔE 0.058
- Jet #212529 ΔE 0.064
- Oxford Blue #1B263B ΔE 0.072
- Navy Blue #001146 ΔE 0.081
- Dark Navy #000435 ΔE 0.085
Use #0A1820 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.