#151D2E
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.035 264.5), rgb(21, 29, 46).
Aa
White text reads best on this color (16.83:1).
About this color
#151D2E is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.035 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 16.83:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.83:1 |
Values
| HEX | #151D2E |
| RGB | rgb(21, 29, 46) |
| HSL | hsl(221, 37%, 13%) |
| OKLCH | oklch(23.2% 0.035 264.5) |
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 #151D2E | 16.83:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #151D2E | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151D2E text on white | 16.83:1 | AAA | Lc 103.7 | Preferred for body text |
| #151D2E 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B3C1DC
oklch(80.9% 0.041 263.6)
-
Step 400
400
#8CA1CB
oklch(70.8% 0.066 264)
-
Step 500
500
#7089BE
oklch(63.2% 0.085 264.7)
-
Step 600
600
#5872AA
oklch(55.6% 0.093 264.6)
-
Step 700
700
#485F92
oklch(49% 0.087 264.9)
-
Step 800
800
#3B4E76
oklch(42.7% 0.071 264.2)
-
Step 900
900
#33415F
oklch(37.7% 0.055 264.7)
-
Step 950
950 (this color)
#151D2E
oklch(23.2% 0.035 264.5)
#151D2E 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) | #171E2F | 0.005 |
| Deuteranopia (no green cones) | #141C2E | 0.004 |
| Tritanopia (no blue cones) | #0C2123 | 0.032 |
| Achromatopsia (no color) | #1D1D1D | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D2E
#151D2E
oklch(23.2% 0.035 264.5)
- #251C08
#251C08
oklch(23.2% 0.036 85.2)
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 #151D2E, 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 0.027
- Oxford Blue #1B263B ΔE 0.038
- Jet #212529 ΔE 0.040
- Rich Navy #001219 ΔE 0.067
- Navy Blue #001146 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.074
- Gunmetal #293241 ΔE 0.084
Use #151D2E 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.