#151C28
Closest named color: Rich Black (#0D1B2A). oklch(22.5% 0.026 261), rgb(21, 28, 40).
Aa
White text reads best on this color (17.09:1).
About this color
#151C28 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 17.09:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.09:1 |
Values
| HEX | #151C28 |
| RGB | rgb(21, 28, 40) |
| HSL | hsl(218, 31%, 12%) |
| OKLCH | oklch(22.5% 0.026 261) |
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 #151C28 | 17.09:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #151C28 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #151C28 text on white | 17.09:1 | AAA | Lc 104.0 | Preferred for body text |
| #151C28 text on black | 1.22:1 | 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
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B6C1D5
oklch(80.9% 0.031 262.5)
-
Step 400
400
#90A1C0
oklch(70.6% 0.049 262.4)
-
Step 500
500
#748AB0
oklch(63% 0.063 261.2)
-
Step 600
600
#5D749B
oklch(55.6% 0.067 260.8)
-
Step 700
700
#4C6185
oklch(49.1% 0.064 260.9)
-
Step 800
800
#3F4F6C
oklch(42.7% 0.053 262)
-
Step 900
900
#354257
oklch(37.7% 0.04 259.9)
-
Step 950
950 (this color)
#151C28
oklch(22.5% 0.026 261)
#151C28 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) | #181D29 | 0.007 |
| Deuteranopia (no green cones) | #161B28 | 0.004 |
| Tritanopia (no blue cones) | #0F1F20 | 0.024 |
| Achromatopsia (no color) | #1C1C1C | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151C28
#151C28
oklch(22.5% 0.026 261)
- #221B0E
#221B0E
oklch(22.7% 0.025 82.3)
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 #151C28, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.014
- Dark #1B2431 ΔE 0.033
- Jet #212529 ΔE 0.040
- Oxford Blue #1B263B ΔE 0.047
- Rich Navy #001219 ΔE 0.060
- Almost Black #070D0D ΔE 0.077
- Navy Blue #001146 ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.081
Use #151C28 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.