#151F21
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.015 211.2), rgb(21, 31, 33).
Aa
White text reads best on this color (16.80:1).
About this color
#151F21 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.029 away. White text reads best on it, at 16.80:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.80:1 |
Values
| HEX | #151F21 |
| RGB | rgb(21, 31, 33) |
| HSL | hsl(190, 22%, 11%) |
| OKLCH | oklch(23.1% 0.015 211.2) |
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 #151F21 | 16.80:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #151F21 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151F21 text on white | 16.80:1 | AAA | Lc 103.7 | Preferred for body text |
| #151F21 text on black | 1.24:1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDD
oklch(88.5% 0.01 212.5)
-
Step 300
300
#B4C4C7
oklch(80.9% 0.018 210.2)
-
Step 400
400
#8DA6AB
oklch(70.8% 0.029 211.1)
-
Step 500
500
#719096
oklch(63.2% 0.036 210.7)
-
Step 600
600
#597A80
oklch(55.7% 0.039 210)
-
Step 700
700
#49676C
oklch(49.2% 0.036 208.9)
-
Step 800
800
#3C5458
oklch(42.8% 0.03 208.9)
-
Step 900
900
#334549
oklch(37.7% 0.024 212.8)
-
Step 950
950 (this color)
#151F21
oklch(23.1% 0.015 211.2)
#151F21 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) | #1D1E21 | 0.014 |
| Deuteranopia (no green cones) | #1B1D21 | 0.012 |
| Tritanopia (no blue cones) | #112020 | 0.007 |
| Achromatopsia (no color) | #1D1D1D | 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 #151F21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.029
- Jet #212529 ΔE 0.033
- Dark #1B2431 ΔE 0.034
- Oxford Blue #1B263B ΔE 0.052
- Rich Navy #001219 ΔE 0.064
- Dark Brown #341C02 ΔE 0.071
- Almost Black #070D0D ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.082
Use #151F21 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.