#101528
Closest named color: Rich Black (#0D1B2A). oklch(20.2% 0.039 271.4), rgb(16, 21, 40).
Aa
White text reads best on this color (18.10:1).
About this color
#101528 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.039 and its hue 271°. 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 18.10:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.10:1 |
Values
| HEX | #101528 |
| RGB | rgb(16, 21, 40) |
| HSL | hsl(228, 43%, 11%) |
| OKLCH | oklch(20.2% 0.039 271.4) |
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 #101528 | 18.10:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #101528 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #101528 text on white | 18.10:1 | AAA | Lc 104.8 | Preferred for body text |
| #101528 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D3D9EB
oklch(88.6% 0.026 271.1)
-
Step 300
300
#B6C0DF
oklch(81% 0.045 271.2)
-
Step 400
400
#909ECF
oklch(70.6% 0.074 272.1)
-
Step 500
500
#7586C3
oklch(63.1% 0.094 271.6)
-
Step 600
600
#5E6FAF
oklch(55.6% 0.102 271.5)
-
Step 700
700
#4D5D97
oklch(49.2% 0.095 270.9)
-
Step 800
800
#3F4C7A
oklch(42.7% 0.078 270.8)
-
Step 900
900
#363F62
oklch(37.6% 0.061 272.2)
-
Step 950
950 (this color)
#101528
oklch(20.2% 0.039 271.4)
#101528 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) | #0E1729 | 0.007 |
| Deuteranopia (no green cones) | #0C1528 | 0.006 |
| Tritanopia (no blue cones) | #07191C | 0.035 |
| Achromatopsia (no color) | #161616 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101528
#101528
oklch(20.2% 0.039 271.4)
- #1D1601
#1D1601
oklch(20.3% 0.039 92.7)
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 #101528, 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 0.044
- Dark #1B2431 ΔE 0.058
- Almost Black #070D0D ΔE 0.062
- Navy Blue #001146 ΔE 0.065
- Jet #212529 ΔE 0.068
- Oxford Blue #1B263B ΔE 0.068
- Dark Navy #000435 ΔE 0.071
Use #101528 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.