#151D23
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.017 240.9), rgb(21, 29, 35).
Aa
White text reads best on this color (17.04:1).
About this color
#151D23 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 17.04:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.04:1 |
Values
| HEX | #151D23 |
| RGB | rgb(21, 29, 35) |
| HSL | hsl(206, 25%, 11%) |
| OKLCH | oklch(22.6% 0.017 240.9) |
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 #151D23 | 17.04:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #151D23 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #151D23 text on white | 17.04:1 | AAA | Lc 103.9 | Preferred for body text |
| #151D23 text on black | 1.23:1 | 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
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B6C3CC
oklch(81% 0.019 237.8)
-
Step 400
400
#90A4B3
oklch(70.8% 0.031 240.4)
-
Step 500
500
#748DA0
oklch(63.1% 0.04 241.1)
-
Step 600
600
#5D778B
oklch(55.6% 0.043 241.6)
-
Step 700
700
#4C6476
oklch(49.1% 0.041 241)
-
Step 800
800
#3F5260
oklch(42.8% 0.033 240.5)
-
Step 900
900
#35444E
oklch(37.8% 0.026 237.6)
-
Step 950
950 (this color)
#151D23
oklch(22.6% 0.017 240.9)
#151D23 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) | #1A1D23 | 0.009 |
| Deuteranopia (no green cones) | #191B23 | 0.009 |
| Tritanopia (no blue cones) | #111E1F | 0.012 |
| Achromatopsia (no color) | #1C1C1C | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D23
#151D23
oklch(22.6% 0.017 240.9)
- #221A14
#221A14
oklch(22.5% 0.017 58.6)
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 #151D23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.035
- Jet #212529 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.052
- Rich Navy #001219 ΔE 0.059
- Almost Black #070D0D ΔE 0.074
- Dark Brown #341C02 ΔE 0.076
- Space Cadet #2B2D42 ΔE 0.084
Use #151D23 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.