#101529
Closest named color: Rich Black (#0D1B2A). oklch(20.2% 0.041 271.7), rgb(16, 21, 41).
Aa
White text reads best on this color (18.08:1).
About this color
#101529 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.041 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 18.08:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.08:1 |
Values
| HEX | #101529 |
| RGB | rgb(16, 21, 41) |
| HSL | hsl(228, 44%, 11%) |
| OKLCH | oklch(20.2% 0.041 271.7) |
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 #101529 | 18.08:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #101529 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #101529 text on white | 18.08:1 | AAA | Lc 104.8 | Preferred for body text |
| #101529 text on black | 1.16:1 | 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
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D3D9EB
oklch(88.6% 0.026 271.1)
-
Step 300
300
#B5BFE1
oklch(80.8% 0.049 272.4)
-
Step 400
400
#8F9ED1
oklch(70.6% 0.077 271.6)
-
Step 500
500
#7486C5
oklch(63.2% 0.097 271.2)
-
Step 600
600
#5D6EB2
oklch(55.5% 0.108 271.9)
-
Step 700
700
#4D5C99
oklch(49.1% 0.1 271.9)
-
Step 800
800
#3F4B7C
oklch(42.6% 0.083 272.1)
-
Step 900
900
#353F64
oklch(37.6% 0.065 271.5)
-
Step 950
950 (this color)
#101529
oklch(20.2% 0.041 271.7)
#101529 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) | #0D172A | 0.008 |
| Deuteranopia (no green cones) | #0B1529 | 0.008 |
| Tritanopia (no blue cones) | #06191D | 0.035 |
| Achromatopsia (no color) | #161616 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101529
#101529
oklch(20.2% 0.041 271.7)
- #1D1600
#1D1600
oklch(20.3% 0.042 93.7)
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 #101529, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Rich Navy #001219 ΔE 0.046
- Dark #1B2431 ΔE 0.058
- Navy Blue #001146 ΔE 0.063
- Almost Black #070D0D ΔE 0.064
- Oxford Blue #1B263B ΔE 0.067
- Jet #212529 ΔE 0.068
- Dark Navy #000435 ΔE 0.070
Use #101529 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.