#10171C
Closest named color: Rich Black (#0D1B2A). oklch(20% 0.015 239.5), rgb(16, 23, 28).
Aa
White text reads best on this color (18.08:1).
About this color
#10171C is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.028 away. White text reads best on it, at 18.08:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.08:1 |
Values
| HEX | #10171C |
| RGB | rgb(16, 23, 28) |
| HSL | hsl(205, 27%, 9%) |
| OKLCH | oklch(20% 0.015 239.5) |
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 #10171C | 18.08:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #10171C | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #10171C text on white | 18.08:1 | AAA | Lc 104.8 | Preferred for body text |
| #10171C 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
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B7C2CB
oklch(80.8% 0.018 242.5)
-
Step 400
400
#92A3B0
oklch(70.6% 0.027 240.8)
-
Step 500
500
#778D9D
oklch(63.2% 0.035 239.7)
-
Step 600
600
#5F7788
oklch(55.6% 0.039 239.2)
-
Step 700
700
#4E6473
oklch(49.1% 0.036 238.3)
-
Step 800
800
#40515E
oklch(42.6% 0.03 241.4)
-
Step 900
900
#37434D
oklch(37.6% 0.023 243.5)
-
Step 950
950 (this color)
#10171C
oklch(20% 0.015 239.5)
#10171C 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) | #15171C | 0.009 |
| Deuteranopia (no green cones) | #13161C | 0.006 |
| Tritanopia (no blue cones) | #0C1819 | 0.011 |
| Achromatopsia (no color) | #161616 | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #10171C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.028
- Rich Navy #001219 ΔE 0.036
- Almost Black #070D0D ΔE 0.049
- Dark #1B2431 ΔE 0.060
- Jet #212529 ΔE 0.062
- Oxford Blue #1B263B ΔE 0.075
- Very Dark Brown #1D0200 ΔE 0.083
- Dark Brown #341C02 ΔE 0.087
Use #10171C 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.