#101B39
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.06 266.6), rgb(16, 27, 57).
Aa
White text reads best on this color (16.96:1).
About this color
#101B39 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.060 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.030 away. White text reads best on it, at 16.96:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.96:1 |
Values
| HEX | #101B39 |
| RGB | rgb(16, 27, 57) |
| HSL | hsl(224, 56%, 14%) |
| OKLCH | oklch(23.1% 0.06 266.6) |
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 #101B39 | 16.96:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #101B39 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #101B39 text on white | 16.96:1 | AAA | Lc 103.8 | Preferred for body text |
| #101B39 text on black | 1.23:1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ACC0F0
oklch(80.9% 0.072 267.1)
-
Step 400
400
#809EE8
oklch(70.7% 0.114 266.7)
-
Step 500
500
#6184E1
oklch(63.1% 0.146 266.7)
-
Step 600
600
#496CCF
oklch(55.7% 0.158 266.6)
-
Step 700
700
#3A59B3
oklch(49% 0.147 266.6)
-
Step 800
800
#304991
oklch(42.6% 0.123 266.8)
-
Step 900
900
#2A3E74
oklch(37.7% 0.096 266.6)
-
Step 950
950 (this color)
#101B39
oklch(23.1% 0.06 266.6)
#101B39 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) | #0D1E3A | 0.010 |
| Deuteranopia (no green cones) | #071B38 | 0.011 |
| Tritanopia (no blue cones) | #002227 | 0.051 |
| Achromatopsia (no color) | #1C1C1C | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B39
#101B39
oklch(23.1% 0.06 266.6)
- #271B00
#271B00
oklch(23.1% 0.047 85.6)
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 #101B39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.030
- Oxford Blue #1B263B ΔE 0.043
- Dark #1B2431 ΔE 0.043
- Navy Blue #001146 ΔE 0.047
- Jet #212529 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.069
- Night Blue #040348 ΔE 0.072
- Rich Navy #001219 ΔE 0.075
Use #101B39 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.