#101730
Closest named color: Rich Black (#0D1B2A). oklch(21.3% 0.05 269.9), rgb(16, 23, 48).
Aa
White text reads best on this color (17.68:1).
About this color
#101730 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.050 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 17.68:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.68:1 |
Values
| HEX | #101730 |
| RGB | rgb(16, 23, 48) |
| HSL | hsl(227, 50%, 13%) |
| OKLCH | oklch(21.3% 0.05 269.9) |
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 #101730 | 17.68:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #101730 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #101730 text on white | 17.68:1 | AAA | Lc 104.4 | Preferred for body text |
| #101730 text on black | 1.18:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1BFE8
oklch(80.8% 0.06 270.2)
-
Step 400
400
#899EDD
oklch(70.7% 0.096 269.7)
-
Step 500
500
#6D84D3
oklch(63% 0.122 270.3)
-
Step 600
600
#556DC0
oklch(55.6% 0.132 269.6)
-
Step 700
700
#465AA6
oklch(49% 0.124 270.2)
-
Step 800
800
#394A87
oklch(42.7% 0.103 269.9)
-
Step 900
900
#313E6C
oklch(37.6% 0.081 270.3)
-
Step 950
950 (this color)
#101730
oklch(21.3% 0.05 269.9)
#101730 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) | #0C1A31 | 0.011 |
| Deuteranopia (no green cones) | #08172F | 0.012 |
| Tritanopia (no blue cones) | #021C21 | 0.043 |
| Achromatopsia (no color) | #181818 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101730
#101730
oklch(21.3% 0.05 269.9)
- #211800
#211800
oklch(21.4% 0.044 90.2)
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 #101730, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.051
- Navy Blue #001146 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.057
- Rich Navy #001219 ΔE 0.058
- Jet #212529 ΔE 0.064
- Dark Navy #000435 ΔE 0.070
- Night Blue #040348 ΔE 0.073
Use #101730 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.