#101C3B
Closest named color: Rich Black (#0D1B2A). oklch(23.5% 0.062 265.9), rgb(16, 28, 59).
Aa
White text reads best on this color (16.78:1).
About this color
#101C3B is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.034 away. White text reads best on it, at 16.78:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.78:1 |
Values
| HEX | #101C3B |
| RGB | rgb(16, 28, 59) |
| HSL | hsl(223, 57%, 15%) |
| OKLCH | oklch(23.5% 0.062 265.9) |
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 #101C3B | 16.78:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #101C3B | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #101C3B text on white | 16.78:1 | AAA | Lc 103.6 | Preferred for body text |
| #101C3B text on black | 1.25:1 | 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
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7E9EEA
oklch(70.7% 0.118 266.1)
-
Step 500
500
#5E84E4
oklch(63.1% 0.151 266)
-
Step 600
600
#456CD2
oklch(55.7% 0.163 265.6)
-
Step 700
700
#3759B6
oklch(49.1% 0.153 265.9)
-
Step 800
800
#2E4993
oklch(42.6% 0.126 266.1)
-
Step 900
900
#293E75
oklch(37.7% 0.098 266.1)
-
Step 950
950 (this color)
#101C3B
oklch(23.5% 0.062 265.9)
#101C3B 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) | #0D1F3C | 0.010 |
| Deuteranopia (no green cones) | #061C3A | 0.012 |
| Tritanopia (no blue cones) | #002328 | 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°).
- #101C3B
#101C3B
oklch(23.5% 0.062 265.9)
- #281C00
#281C00
oklch(23.5% 0.048 86.2)
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 #101C3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.034
- Oxford Blue #1B263B ΔE 0.040
- Dark #1B2431 ΔE 0.042
- Navy Blue #001146 ΔE 0.047
- Jet #212529 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.067
- Night Blue #040348 ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.075
Use #101C3B 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.