#101B28
Closest named color: Rich Black (#0D1B2A). oklch(21.9% 0.03 253.2), rgb(16, 27, 40).
Aa
White text reads best on this color (17.36:1).
About this color
#101B28 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.030 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.006 away. White text reads best on it, at 17.36:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.36:1 |
Values
| HEX | #101B28 |
| RGB | rgb(16, 27, 40) |
| HSL | hsl(213, 43%, 11%) |
| OKLCH | oklch(21.9% 0.03 253.2) |
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 #101B28 | 17.36:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #101B28 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #101B28 text on white | 17.36:1 | AAA | Lc 104.2 | Preferred for body text |
| #101B28 text on black | 1.20:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B1C2D8
oklch(80.8% 0.036 254.9)
-
Step 400
400
#88A3C4
oklch(70.7% 0.057 253.7)
-
Step 500
500
#6A8CB5
oklch(63.1% 0.073 253.5)
-
Step 600
600
#5176A1
oklch(55.6% 0.079 252.9)
-
Step 700
700
#42638A
oklch(49.2% 0.074 253.3)
-
Step 800
800
#365170
oklch(42.7% 0.061 252.6)
-
Step 900
900
#2F435B
oklch(37.7% 0.049 253.5)
-
Step 950
950 (this color)
#101B28
oklch(21.9% 0.03 253.2)
#101B28 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) | #161C29 | 0.011 |
| Deuteranopia (no green cones) | #131928 | 0.008 |
| Tritanopia (no blue cones) | #061E1F | 0.027 |
| Achromatopsia (no color) | #1A1A1A | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B28
#101B28
oklch(21.9% 0.03 253.2)
- #23180A
#23180A
oklch(21.9% 0.03 71.9)
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 #101B28, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.006
- Dark #1B2431 ΔE 0.040
- Jet #212529 ΔE 0.048
- Rich Navy #001219 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.052
- Almost Black #070D0D ΔE 0.071
- Navy Blue #001146 ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.088
Use #101B28 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.