#0A1817
Closest named color: Rich Navy (#001219). oklch(19.6% 0.02 189.8), rgb(10, 24, 23).
Aa
White text reads best on this color (18.16:1).
About this color
#0A1817 is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Navy (#001219), ΔE 0.033 away. White text reads best on it, at 18.16:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.15:1 |
| White text | 18.16:1 |
Values
| HEX | #0A1817 |
| RGB | rgb(10, 24, 23) |
| HSL | hsl(176, 41%, 7%) |
| OKLCH | oklch(19.6% 0.02 189.8) |
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 #0A1817 | 18.16:1 | AAA | Lc -107.0 | Preferred for body text |
| Black text on #0A1817 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #0A1817 text on white | 18.16:1 | AAA | Lc 104.8 | Preferred for body text |
| #0A1817 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D0DCDB
oklch(88.5% 0.013 190.9)
-
Step 300
300
#B0C6C4
oklch(80.9% 0.024 190)
-
Step 400
400
#87A8A6
oklch(70.6% 0.036 191.8)
-
Step 500
500
#689390
oklch(63.1% 0.047 190.6)
-
Step 600
600
#4E7D7A
oklch(55.5% 0.052 190.6)
-
Step 700
700
#3F6A67
oklch(49.2% 0.048 190)
-
Step 800
800
#345654
oklch(42.7% 0.04 191)
-
Step 900
900
#2E4745
oklch(37.7% 0.031 189.6)
-
Step 950
950 (this color)
#0A1817
oklch(19.6% 0.02 189.8)
#0A1817 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) | #171717 | 0.022 |
| Deuteranopia (no green cones) | #141517 | 0.019 |
| Tritanopia (no blue cones) | #051918 | 0.007 |
| Achromatopsia (no color) | #161616 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A1817
#0A1817
oklch(19.6% 0.02 189.8)
- #1D1113
#1D1113
oklch(19.5% 0.02 8.1)
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 #0A1817, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.033
- Rich Black #0D1B2A ΔE 0.038
- Almost Black #070D0D ΔE 0.045
- Dark #1B2431 ΔE 0.068
- Jet #212529 ΔE 0.068
- Oxford Blue #1B263B ΔE 0.084
- Very Dark Brown #1D0200 ΔE 0.085
- Dark Brown #341C02 ΔE 0.089
Use #0A1817 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.