#171B10
Closest named color: Rich Black (#0D1B2A). oklch(21.4% 0.021 124.4), rgb(23, 27, 16).
Aa
White text reads best on this color (17.48:1).
About this color
#171B10 is a very dark close to neutral grey. In OKLCH its lightness is 21%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.052 away. White text reads best on it, at 17.48:1.
| Hue family | Neutrals |
| Lightness | very dark (21%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.48:1 |
Values
| HEX | #171B10 |
| RGB | rgb(23, 27, 16) |
| HSL | hsl(82, 26%, 8%) |
| OKLCH | oklch(21.4% 0.021 124.4) |
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 #171B10 | 17.48:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #171B10 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #171B10 text on white | 17.48:1 | AAA | Lc 104.3 | Preferred for body text |
| #171B10 text on black | 1.20:1 | 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
#F5F6F3
oklch(97.2% 0.004 121.6)
-
Step 100
100
#E9EBE5
oklch(93.7% 0.008 121.6)
-
Step 200
200
#D7DBD1
oklch(88.6% 0.014 124.6)
-
Step 300
300
#BDC4B2
oklch(81% 0.026 124.3)
-
Step 400
400
#9BA58A
oklch(70.6% 0.04 124)
-
Step 500
500
#828F6D
oklch(63% 0.051 124.9)
-
Step 600
600
#6C7955
oklch(55.5% 0.055 124.3)
-
Step 700
700
#5A6645
oklch(49.1% 0.052 124.5)
-
Step 800
800
#4A5339
oklch(42.7% 0.043 123.7)
-
Step 900
900
#3E4531
oklch(37.8% 0.034 123.7)
-
Step 950
950 (this color)
#171B10
oklch(21.4% 0.021 124.4)
#171B10 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) | #1C1A0F | 0.010 |
| Deuteranopia (no green cones) | #1C1910 | 0.012 |
| Tritanopia (no blue cones) | #181A18 | 0.017 |
| Achromatopsia (no color) | #1A1A1A | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171B10
#171B10
oklch(21.4% 0.021 124.4)
- #1B1721
#1B1721
oklch(21.4% 0.02 303)
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 #171B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.052
- Jet #212529 ΔE 0.056
- Rich Navy #001219 ΔE 0.061
- Dark Brown #341C02 ΔE 0.061
- Dark #1B2431 ΔE 0.063
- Almost Black #070D0D ΔE 0.065
- Dark Forest Green #002D04 ΔE 0.077
- Very Dark Green #062E03 ΔE 0.079
Use #171B10 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.