#151D2F
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.037 265.3), rgb(21, 29, 47).
Aa
White text reads best on this color (16.81:1).
About this color
#151D2F is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.037 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.017 away. White text reads best on it, at 16.81:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.81:1 |
Values
| HEX | #151D2F |
| RGB | rgb(21, 29, 47) |
| HSL | hsl(222, 38%, 13%) |
| OKLCH | oklch(23.2% 0.037 265.3) |
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 #151D2F | 16.81:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #151D2F | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151D2F text on white | 16.81:1 | AAA | Lc 103.7 | Preferred for body text |
| #151D2F 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DE
oklch(81% 0.044 264.9)
-
Step 400
400
#8CA0CD
oklch(70.7% 0.07 266)
-
Step 500
500
#6F88C0
oklch(63% 0.09 265.5)
-
Step 600
600
#5871AD
oklch(55.6% 0.098 266.1)
-
Step 700
700
#485F94
oklch(49.1% 0.09 265.4)
-
Step 800
800
#3B4E78
oklch(42.8% 0.074 264.9)
-
Step 900
900
#324161
oklch(37.7% 0.059 264.6)
-
Step 950
950 (this color)
#151D2F
oklch(23.2% 0.037 265.3)
#151D2F 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) | #161E30 | 0.004 |
| Deuteranopia (no green cones) | #141C2F | 0.004 |
| Tritanopia (no blue cones) | #0B2123 | 0.034 |
| Achromatopsia (no color) | #1D1D1D | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D2F
#151D2F
oklch(23.2% 0.037 265.3)
- #251C07
#251C07
oklch(23.2% 0.037 86.2)
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 #151D2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.017
- Dark #1B2431 ΔE 0.027
- Oxford Blue #1B263B ΔE 0.037
- Jet #212529 ΔE 0.041
- Rich Navy #001219 ΔE 0.068
- Navy Blue #001146 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.073
- Gunmetal #293241 ΔE 0.083
Use #151D2F 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.