#10171E
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.018 248.7), rgb(16, 23, 30).
Aa
White text reads best on this color (18.05:1).
About this color
#10171E is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.025 away. White text reads best on it, at 18.05:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.05:1 |
Values
| HEX | #10171E |
| RGB | rgb(16, 23, 30) |
| HSL | hsl(210, 30%, 9%) |
| OKLCH | oklch(20.1% 0.018 248.7) |
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 #10171E | 18.05:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #10171E | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #10171E text on white | 18.05:1 | AAA | Lc 104.8 | Preferred for body text |
| #10171E 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE1
oklch(88.5% 0.012 248)
-
Step 300
300
#B7C2CE
oklch(80.9% 0.021 250.4)
-
Step 400
400
#91A3B5
oklch(70.7% 0.033 248.3)
-
Step 500
500
#768CA3
oklch(63.1% 0.043 249.7)
-
Step 600
600
#5E768E
oklch(55.6% 0.047 248.7)
-
Step 700
700
#4E6379
oklch(49.1% 0.044 249.9)
-
Step 800
800
#405162
oklch(42.7% 0.035 248.7)
-
Step 900
900
#364350
oklch(37.7% 0.028 248.6)
-
Step 950
950 (this color)
#10171E
oklch(20.1% 0.018 248.7)
#10171E 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) | #14171E | 0.007 |
| Deuteranopia (no green cones) | #13161E | 0.006 |
| Tritanopia (no blue cones) | #0C1919 | 0.016 |
| Achromatopsia (no color) | #161616 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10171E
#10171E
oklch(20.1% 0.018 248.7)
- #1C150E
#1C150E
oklch(20.2% 0.017 66.6)
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 #10171E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.025
- Rich Navy #001219 ΔE 0.036
- Almost Black #070D0D ΔE 0.051
- Dark #1B2431 ΔE 0.058
- Jet #212529 ΔE 0.062
- Oxford Blue #1B263B ΔE 0.073
- Very Dark Brown #1D0200 ΔE 0.085
- Navy Blue #001146 ΔE 0.086
Use #10171E 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.