#101B33
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.05 264.2), rgb(16, 27, 51).
Aa
White text reads best on this color (17.12:1).
About this color
#101B33 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.050 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.019 away. White text reads best on it, at 17.12:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.12:1 |
Values
| HEX | #101B33 |
| RGB | rgb(16, 27, 51) |
| HSL | hsl(221, 52%, 13%) |
| OKLCH | oklch(22.6% 0.05 264.2) |
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 #101B33 | 17.12:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #101B33 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #101B33 text on white | 17.12:1 | AAA | Lc 103.9 | Preferred for body text |
| #101B33 text on black | 1.22:1 | 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
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9EF
oklch(88.4% 0.033 264.4)
-
Step 300
300
#AEC1E7
oklch(80.9% 0.058 264.2)
-
Step 400
400
#83A0DC
oklch(70.7% 0.094 264.3)
-
Step 500
500
#6487D2
oklch(63% 0.12 264.3)
-
Step 600
600
#4C70BF
oklch(55.7% 0.13 264.2)
-
Step 700
700
#3D5DA5
oklch(49.1% 0.121 264.4)
-
Step 800
800
#324C86
oklch(42.6% 0.102 264.3)
-
Step 900
900
#2C406B
oklch(37.7% 0.078 264.1)
-
Step 950
950 (this color)
#101B33
oklch(22.6% 0.05 264.2)
#101B33 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) | #111D34 | 0.007 |
| Deuteranopia (no green cones) | #0C1A32 | 0.007 |
| Tritanopia (no blue cones) | #002024 | 0.044 |
| Achromatopsia (no color) | #1C1C1C | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B33
#101B33
oklch(22.6% 0.05 264.2)
- #261A00
#261A00
oklch(22.7% 0.046 85)
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 #101B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.019
- Dark #1B2431 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.044
- Jet #212529 ΔE 0.054
- Navy Blue #001146 ΔE 0.055
- Rich Navy #001219 ΔE 0.066
- Night Blue #040348 ΔE 0.079
- Dark Indigo #1F0954 ΔE 0.079
Use #101B33 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.