#10171D
Closest named color: Rich Black (#0D1B2A). oklch(20% 0.016 244.6), rgb(16, 23, 29).
Aa
White text reads best on this color (18.06:1).
About this color
#10171D is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 18.06:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.06:1 |
Values
| HEX | #10171D |
| RGB | rgb(16, 23, 29) |
| HSL | hsl(208, 29%, 9%) |
| OKLCH | oklch(20% 0.016 244.6) |
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 #10171D | 18.06:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #10171D | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #10171D text on white | 18.06:1 | AAA | Lc 104.8 | Preferred for body text |
| #10171D 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
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B7C2CC
oklch(80.9% 0.019 245.4)
-
Step 400
400
#91A3B3
oklch(70.7% 0.031 245.1)
-
Step 500
500
#768CA0
oklch(63% 0.039 245.9)
-
Step 600
600
#5F768B
oklch(55.5% 0.043 246.2)
-
Step 700
700
#4E6376
oklch(49% 0.04 246)
-
Step 800
800
#405160
oklch(42.7% 0.033 245.3)
-
Step 900
900
#36434E
oklch(37.6% 0.025 244)
-
Step 950
950 (this color)
#10171D
oklch(20% 0.016 244.6)
#10171D 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) | #15171D | 0.009 |
| Deuteranopia (no green cones) | #13161D | 0.006 |
| Tritanopia (no blue cones) | #0C1819 | 0.012 |
| Achromatopsia (no color) | #161616 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10171D
#10171D
oklch(20% 0.016 244.6)
- #1B150E
#1B150E
oklch(20.1% 0.016 71)
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 #10171D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Rich Navy #001219 ΔE 0.036
- Almost Black #070D0D ΔE 0.050
- Dark #1B2431 ΔE 0.059
- Jet #212529 ΔE 0.062
- Oxford Blue #1B263B ΔE 0.074
- Very Dark Brown #1D0200 ΔE 0.084
- Navy Blue #001146 ΔE 0.088
Use #10171D 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.