#151B2D
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.036 269.3), rgb(21, 27, 45).
Aa
White text reads best on this color (17.12:1).
About this color
#151B2D is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.036 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.014 away. White text reads best on it, at 17.12:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.12:1 |
Values
| HEX | #151B2D |
| RGB | rgb(21, 27, 45) |
| HSL | hsl(225, 36%, 13%) |
| OKLCH | oklch(22.6% 0.036 269.3) |
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 #151B2D | 17.12:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #151B2D | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #151B2D text on white | 17.12:1 | AAA | Lc 104.0 | Preferred for body text |
| #151B2D 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
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B5C0DD
oklch(80.9% 0.043 269)
-
Step 400
400
#8F9FCC
oklch(70.6% 0.069 269.4)
-
Step 500
500
#7487BF
oklch(63.1% 0.088 269.4)
-
Step 600
600
#5D70AC
oklch(55.6% 0.096 269.7)
-
Step 700
700
#4C5E93
oklch(49.1% 0.088 268.8)
-
Step 800
800
#3F4D78
oklch(42.8% 0.074 269.4)
-
Step 900
900
#354060
oklch(37.7% 0.057 269.1)
-
Step 950
950 (this color)
#151B2D
oklch(22.6% 0.036 269.3)
#151B2D 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) | #151D2E | 0.007 |
| Deuteranopia (no green cones) | #121B2D | 0.005 |
| Tritanopia (no blue cones) | #0D1F21 | 0.034 |
| Achromatopsia (no color) | #1C1C1C | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B2D
#151B2D
oklch(22.6% 0.036 269.3)
- #231B06
#231B06
oklch(22.6% 0.037 88.7)
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 #151B2D, 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 0.034
- Oxford Blue #1B263B ΔE 0.044
- Jet #212529 ΔE 0.046
- Rich Navy #001219 ΔE 0.063
- Navy Blue #001146 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.079
- Midnight Purple #280137 ΔE 0.081
Use #151B2D 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.