#151B24
Closest named color: Rich Black (#0D1B2A). oklch(22% 0.02 258.3), rgb(21, 27, 36).
Aa
White text reads best on this color (17.29:1).
About this color
#151B24 is a very dark close to neutral grey. In OKLCH its lightness is 22%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.29:1.
| Hue family | Neutrals |
| Lightness | very dark (22%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.29:1 |
Values
| HEX | #151B24 |
| RGB | rgb(21, 27, 36) |
| HSL | hsl(216, 26%, 11%) |
| OKLCH | oklch(22% 0.02 258.3) |
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 #151B24 | 17.29:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #151B24 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #151B24 text on white | 17.29:1 | AAA | Lc 104.2 | Preferred for body text |
| #151B24 text on black | 1.21:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE2
oklch(88.6% 0.013 255.5)
-
Step 300
300
#B7C1D0
oklch(80.8% 0.024 258.4)
-
Step 400
400
#92A2B9
oklch(70.7% 0.038 257.4)
-
Step 500
500
#788BA7
oklch(63.2% 0.048 258)
-
Step 600
600
#617492
oklch(55.5% 0.052 259.4)
-
Step 700
700
#50627D
oklch(49.2% 0.049 258.3)
-
Step 800
800
#415065
oklch(42.7% 0.04 256.8)
-
Step 900
900
#374252
oklch(37.6% 0.031 257.7)
-
Step 950
950 (this color)
#151B24
oklch(22% 0.02 258.3)
#151B24 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) | #181B24 | 0.005 |
| Deuteranopia (no green cones) | #161A24 | 0.004 |
| Tritanopia (no blue cones) | #111D1E | 0.017 |
| Achromatopsia (no color) | #1B1B1B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B24
#151B24
oklch(22% 0.02 258.3)
- #201A10
#201A10
oklch(22.2% 0.02 80.1)
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 #151B24, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Dark #1B2431 ΔE 0.038
- Jet #212529 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.054
- Rich Navy #001219 ΔE 0.055
- Almost Black #070D0D ΔE 0.070
- Dark Brown #341C02 ΔE 0.081
- Navy Blue #001146 ΔE 0.083
Use #151B24 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.