#151B33
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.047 271.6), rgb(21, 27, 51).
Aa
White text reads best on this color (16.98:1).
About this color
#151B33 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.047 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 16.98:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.98:1 |
Values
| HEX | #151B33 |
| RGB | rgb(21, 27, 51) |
| HSL | hsl(228, 42%, 14%) |
| OKLCH | oklch(23% 0.047 271.6) |
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 #151B33 | 16.98:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #151B33 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #151B33 text on white | 16.98:1 | AAA | Lc 103.8 | Preferred for body text |
| #151B33 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D1D8EE
oklch(88.4% 0.031 271.7)
-
Step 300
300
#B3BFE6
oklch(80.8% 0.057 271.7)
-
Step 400
400
#8C9DD9
oklch(70.6% 0.09 271.8)
-
Step 500
500
#7184CF
oklch(63.1% 0.115 272)
-
Step 600
600
#5A6DBC
oklch(55.7% 0.124 271.6)
-
Step 700
700
#4A5AA2
oklch(49% 0.117 272)
-
Step 800
800
#3D4A83
oklch(42.7% 0.096 272.1)
-
Step 900
900
#333E69
oklch(37.6% 0.075 271.5)
-
Step 950
950 (this color)
#151B33
oklch(23% 0.047 271.6)
#151B33 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) | #121E34 | 0.010 |
| Deuteranopia (no green cones) | #0F1B32 | 0.009 |
| Tritanopia (no blue cones) | #092024 | 0.042 |
| Achromatopsia (no color) | #1C1C1C | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B33
#151B33
oklch(23% 0.047 271.6)
- #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 #151B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Dark #1B2431 ΔE 0.035
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.050
- Navy Blue #001146 ΔE 0.059
- Rich Navy #001219 ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.076
- Midnight Purple #280137 ΔE 0.076
Use #151B33 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.