#151C2F
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.038 267.9), rgb(21, 28, 47).
Aa
White text reads best on this color (16.94:1).
About this color
#151C2F is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.038 and its hue 268°. 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 16.94:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.94:1 |
Values
| HEX | #151C2F |
| RGB | rgb(21, 28, 47) |
| HSL | hsl(224, 38%, 13%) |
| OKLCH | oklch(23% 0.038 267.9) |
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 #151C2F | 16.94:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #151C2F | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #151C2F text on white | 16.94:1 | AAA | Lc 103.8 | Preferred for body text |
| #151C2F 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8D9FCF
oklch(70.6% 0.073 268.5)
-
Step 500
500
#7187C2
oklch(63% 0.093 268)
-
Step 600
600
#5A70AF
oklch(55.6% 0.102 268.4)
-
Step 700
700
#4A5E96
oklch(49.2% 0.093 268)
-
Step 800
800
#3C4D7A
oklch(42.7% 0.078 267.4)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950 (this color)
#151C2F
oklch(23% 0.038 267.9)
#151C2F 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) | #151E30 | 0.007 |
| Deuteranopia (no green cones) | #121B2F | 0.006 |
| Tritanopia (no blue cones) | #0B2023 | 0.034 |
| Achromatopsia (no color) | #1D1D1D | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151C2F
#151C2F
oklch(23% 0.038 267.9)
- #241C05
#241C05
oklch(23% 0.039 90.3)
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 #151C2F, 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 0.031
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.044
- Rich Navy #001219 ΔE 0.067
- Navy Blue #001146 ΔE 0.067
- Space Cadet #2B2D42 ΔE 0.076
- Midnight Purple #280137 ΔE 0.082
Use #151C2F 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.