#0B1528
Closest named color: Rich Black (#0D1B2A). oklch(19.8% 0.041 262.2), rgb(11, 21, 40).
Aa
White text reads best on this color (18.22:1).
About this color
#0B1528 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.041 and its hue 262°. 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 18.22:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.22:1 |
Values
| HEX | #0B1528 |
| RGB | rgb(11, 21, 40) |
| HSL | hsl(219, 57%, 10%) |
| OKLCH | oklch(19.8% 0.041 262.2) |
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 #0B1528 | 18.22:1 | AAA | Lc -107.0 | Preferred for body text |
| Black text on #0B1528 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #0B1528 text on white | 18.22:1 | AAA | Lc 104.8 | Preferred for body text |
| #0B1528 text on black | 1.15:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0DAEC
oklch(88.6% 0.027 262.3)
-
Step 300
300
#B0C1E1
oklch(80.9% 0.049 263.1)
-
Step 400
400
#86A1D2
oklch(70.7% 0.078 262.1)
-
Step 500
500
#6889C6
oklch(63.1% 0.1 262.1)
-
Step 600
600
#5072B3
oklch(55.6% 0.109 262.4)
-
Step 700
700
#415F9A
oklch(49.1% 0.102 262.8)
-
Step 800
800
#354E7D
oklch(42.7% 0.084 262.2)
-
Step 900
900
#2E4164
oklch(37.6% 0.065 262)
-
Step 950
950 (this color)
#0B1528
oklch(19.8% 0.041 262.2)
#0B1528 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) | #0D1729 | 0.008 |
| Deuteranopia (no green cones) | #091428 | 0.005 |
| Tritanopia (no blue cones) | #00191C | 0.036 |
| Achromatopsia (no color) | #151515 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B1528
#0B1528
oklch(19.8% 0.041 262.2)
- #1E1300
#1E1300
oklch(19.6% 0.04 82.5)
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 #0B1528, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Rich Navy #001219 ΔE 0.039
- Almost Black #070D0D ΔE 0.059
- Dark #1B2431 ΔE 0.062
- Navy Blue #001146 ΔE 0.062
- Dark Navy #000435 ΔE 0.066
- Oxford Blue #1B263B ΔE 0.072
- Jet #212529 ΔE 0.072
Use #0B1528 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.