#151B35
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.051 272.1), rgb(21, 27, 53).
Aa
White text reads best on this color (16.93:1).
About this color
#151B35 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.051 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 16.93:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.93:1 |
Values
| HEX | #151B35 |
| RGB | rgb(21, 27, 53) |
| HSL | hsl(229, 43%, 15%) |
| OKLCH | oklch(23.1% 0.051 272.1) |
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 #151B35 | 16.93:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #151B35 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151B35 text on white | 16.93:1 | AAA | Lc 103.8 | Preferred for body text |
| #151B35 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B3BFE9
oklch(81% 0.061 272.5)
-
Step 400
400
#8B9DDD
oklch(70.7% 0.096 271.7)
-
Step 500
500
#7083D4
oklch(63.1% 0.124 272.4)
-
Step 600
600
#596BC1
oklch(55.5% 0.135 272.4)
-
Step 700
700
#4959A7
oklch(49.1% 0.126 272.3)
-
Step 800
800
#3C4987
oklch(42.6% 0.104 272.4)
-
Step 900
900
#333E6C
oklch(37.8% 0.08 271.9)
-
Step 950
950 (this color)
#151B35
oklch(23.1% 0.051 272.1)
#151B35 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) | #101E36 | 0.011 |
| Deuteranopia (no green cones) | #0D1B34 | 0.012 |
| Tritanopia (no blue cones) | #072125 | 0.046 |
| Achromatopsia (no color) | #1D1D1D | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B35
#151B35
oklch(23.1% 0.051 272.1)
- #251C00
#251C00
oklch(23.1% 0.047 92)
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 #151B35, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Dark #1B2431 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.057
- Rich Navy #001219 ΔE 0.073
- Dark Indigo #1F0954 ΔE 0.074
- Midnight Purple #280137 ΔE 0.075
Use #151B35 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.