#101737
Closest named color: Rich Black (#0D1B2A). oklch(21.9% 0.063 271.1), rgb(16, 23, 55).
Aa
White text reads best on this color (17.50:1).
About this color
#101737 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.063 and its hue 271°. 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 17.50:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.50:1 |
Values
| HEX | #101737 |
| RGB | rgb(16, 23, 55) |
| HSL | hsl(229, 55%, 14%) |
| OKLCH | oklch(21.9% 0.063 271.1) |
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 #101737 | 17.50:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #101737 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #101737 text on white | 17.50:1 | AAA | Lc 104.2 | Preferred for body text |
| #101737 text on black | 1.19:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AFBFF2
oklch(81% 0.074 271.1)
-
Step 400
400
#859CEB
oklch(70.7% 0.119 270.8)
-
Step 500
500
#6881E5
oklch(63.1% 0.153 270.9)
-
Step 600
600
#5168D3
oklch(55.6% 0.166 271)
-
Step 700
700
#4256B7
oklch(49.1% 0.154 270.9)
-
Step 800
800
#364794
oklch(42.7% 0.128 270.8)
-
Step 900
900
#2F3C76
oklch(37.7% 0.1 271.4)
-
Step 950
950 (this color)
#101737
oklch(21.9% 0.063 271.1)
#101737 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) | #071B38 | 0.016 |
| Deuteranopia (no green cones) | #021836 | 0.019 |
| Tritanopia (no blue cones) | #001E24 | 0.054 |
| Achromatopsia (no color) | #191919 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101737
#101737
oklch(21.9% 0.063 271.1)
- #221900
#221900
oklch(21.8% 0.045 90.7)
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 #101737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.032
- Navy Blue #001146 ΔE 0.042
- Dark #1B2431 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.055
- Night Blue #040348 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.066
- Dark Navy #000435 ΔE 0.068
- Rich Navy #001219 ΔE 0.069
Use #101737 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.