#151B2B
Closest named color: Rich Black (#0D1B2A). oklch(22.4% 0.033 268), rgb(21, 27, 43).
Aa
White text reads best on this color (17.16:1).
About this color
#151B2B is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.033 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.012 away. White text reads best on it, at 17.16:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.16:1 |
Values
| HEX | #151B2B |
| RGB | rgb(21, 27, 43) |
| HSL | hsl(224, 34%, 13%) |
| OKLCH | oklch(22.4% 0.033 268) |
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 #151B2B | 17.16:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #151B2B | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #151B2B text on white | 17.16:1 | AAA | Lc 104.0 | Preferred for body text |
| #151B2B 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D3D9E8
oklch(88.5% 0.022 268.4)
-
Step 300
300
#B6C0DA
oklch(80.8% 0.038 268.8)
-
Step 400
400
#90A0C8
oklch(70.7% 0.061 267.8)
-
Step 500
500
#7588BA
oklch(63.1% 0.079 268.1)
-
Step 600
600
#5E71A6
oklch(55.6% 0.086 268.5)
-
Step 700
700
#4D5F8E
oklch(49.1% 0.079 267.5)
-
Step 800
800
#3F4D74
oklch(42.6% 0.068 268.4)
-
Step 900
900
#36415D
oklch(37.8% 0.05 267.5)
-
Step 950
950 (this color)
#151B2B
oklch(22.4% 0.033 268)
#151B2B 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) | #151C2C | 0.004 |
| Deuteranopia (no green cones) | #131A2B | 0.005 |
| Tritanopia (no blue cones) | #0E1E21 | 0.028 |
| Achromatopsia (no color) | #1B1B1B | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B2B
#151B2B
oklch(22.4% 0.033 268)
- #221B08
#221B08
oklch(22.5% 0.034 89.4)
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 #151B2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.012
- Dark #1B2431 ΔE 0.034
- Jet #212529 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.046
- Rich Navy #001219 ΔE 0.061
- Navy Blue #001146 ΔE 0.071
- Almost Black #070D0D ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.081
Use #151B2B 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.