#101D3B
Closest named color: Rich Black (#0D1B2A). oklch(23.7% 0.06 264.6), rgb(16, 29, 59).
Aa
White text reads best on this color (16.65:1).
About this color
#101D3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.060 and its hue 265°. 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 16.65:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.65:1 |
Values
| HEX | #101D3B |
| RGB | rgb(16, 29, 59) |
| HSL | hsl(222, 57%, 15%) |
| OKLCH | oklch(23.7% 0.06 264.6) |
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 #101D3B | 16.65:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #101D3B | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #101D3B text on white | 16.65:1 | AAA | Lc 103.5 | Preferred for body text |
| #101D3B text on black | 1.26:1 | 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
#CCD9F4
oklch(88.4% 0.04 265.1)
-
Step 300
300
#AAC1F0
oklch(81% 0.071 264.4)
-
Step 400
400
#7D9FE8
oklch(70.7% 0.114 264.6)
-
Step 500
500
#5C85E1
oklch(63% 0.146 264.5)
-
Step 600
600
#436DCF
oklch(55.6% 0.159 264.4)
-
Step 700
700
#355AB3
oklch(49% 0.148 264.6)
-
Step 800
800
#2C4A91
oklch(42.6% 0.123 264.5)
-
Step 900
900
#283F74
oklch(37.8% 0.095 264.6)
-
Step 950
950 (this color)
#101D3B
oklch(23.7% 0.06 264.6)
#101D3B 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) | #0F203C | 0.010 |
| Deuteranopia (no green cones) | #081C3A | 0.011 |
| Tritanopia (no blue cones) | #002429 | 0.051 |
| Achromatopsia (no color) | #1E1E1E | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101D3B
#101D3B
oklch(23.7% 0.06 264.6)
- #291C00
#291C00
oklch(23.6% 0.048 84.3)
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 #101D3B, 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 0.037
- Dark #1B2431 ΔE 0.039
- Navy Blue #001146 ΔE 0.050
- Jet #212529 ΔE 0.057
- Dark Indigo #1F0954 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.072
- Night Blue #040348 ΔE 0.076
Use #101D3B 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.