#1F151B
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.02 342.2), rgb(31, 21, 27).
Aa
White text reads best on this color (17.77:1).
About this color
#1F151B is a very dark close to neutral grey. In OKLCH its lightness is 21%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.041 away. White text reads best on it, at 17.77:1.
| Hue family | Neutrals |
| Lightness | very dark (21%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.77:1 |
Values
| HEX | #1F151B |
| RGB | rgb(31, 21, 27) |
| HSL | hsl(324, 19%, 10%) |
| OKLCH | oklch(21.1% 0.02 342.2) |
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 #1F151B | 17.77:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #1F151B | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #1F151B text on white | 17.77:1 | AAA | Lc 104.5 | Preferred for body text |
| #1F151B text on black | 1.18:1 | 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
#F7F5F6
oklch(97.2% 0.002 345.2)
-
Step 100
100
#EDE8EB
oklch(93.6% 0.007 340.4)
-
Step 200
200
#E0D6DB
oklch(88.6% 0.013 345.5)
-
Step 300
300
#CCBBC5
oklch(80.9% 0.024 341.4)
-
Step 400
400
#B298A7
oklch(70.7% 0.037 342.5)
-
Step 500
500
#9E7E91
oklch(62.9% 0.047 342.2)
-
Step 600
600
#89687C
oklch(55.7% 0.051 341.9)
-
Step 700
700
#745668
oklch(49% 0.048 342.3)
-
Step 800
800
#5F4655
oklch(42.6% 0.041 342.3)
-
Step 900
900
#4E3B46
oklch(37.7% 0.032 343.1)
-
Step 950
950 (this color)
#1F151B
oklch(21.1% 0.02 342.2)
#1F151B 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) | #15171B | 0.021 |
| Deuteranopia (no green cones) | #18181B | 0.017 |
| Tritanopia (no blue cones) | #201517 | 0.008 |
| Achromatopsia (no color) | #181818 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F151B
#1F151B
oklch(21.1% 0.02 342.2)
- #101B16
#101B16
oklch(21% 0.019 164.8)
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 #1F151B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.041
- Jet #212529 ΔE 0.056
- Dark #1B2431 ΔE 0.057
- Rich Navy #001219 ΔE 0.061
- Almost Black #070D0D ΔE 0.065
- Dark Brown #341C02 ΔE 0.070
- Oxford Blue #1B263B ΔE 0.073
- Very Dark Brown #1D0200 ΔE 0.075
Use #1F151B 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.