#101B3A
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.062 266.9), rgb(16, 27, 58).
Aa
White text reads best on this color (16.93:1).
About this color
#101B3A is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.032 away. White text reads best on it, at 16.93:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.93:1 |
Values
| HEX | #101B3A |
| RGB | rgb(16, 27, 58) |
| HSL | hsl(224, 57%, 15%) |
| OKLCH | oklch(23.1% 0.062 266.9) |
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 #101B3A | 16.93:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #101B3A | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #101B3A text on white | 16.93:1 | AAA | Lc 103.7 | Preferred for body text |
| #101B3A 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F1
oklch(80.9% 0.073 266.7)
-
Step 400
400
#7F9EEA
oklch(70.7% 0.117 266.5)
-
Step 500
500
#6084E3
oklch(63.1% 0.149 266.6)
-
Step 600
600
#486BD1
oklch(55.6% 0.162 266.8)
-
Step 700
700
#3A59B5
oklch(49.2% 0.15 266.8)
-
Step 800
800
#304993
oklch(42.7% 0.125 267)
-
Step 900
900
#2A3E75
oklch(37.8% 0.097 266.7)
-
Step 950
950 (this color)
#101B3A
oklch(23.1% 0.062 266.9)
#101B3A 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) | #0C1F3B | 0.013 |
| Deuteranopia (no green cones) | #061B39 | 0.012 |
| Tritanopia (no blue cones) | #002227 | 0.053 |
| Achromatopsia (no color) | #1D1D1D | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101B3A
#101B3A
oklch(23.1% 0.062 266.9)
- #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 #101B3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.032
- Oxford Blue #1B263B ΔE 0.043
- Dark #1B2431 ΔE 0.044
- Navy Blue #001146 ΔE 0.046
- Jet #212529 ΔE 0.061
- Dark Indigo #1F0954 ΔE 0.067
- Night Blue #040348 ΔE 0.071
- Rich Navy #001219 ΔE 0.077
Use #101B3A 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.