#101733
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.056 270.6), rgb(16, 23, 51).
Aa
White text reads best on this color (17.61:1).
About this color
#101733 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.056 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.025 away. White text reads best on it, at 17.61:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.61:1 |
Values
| HEX | #101733 |
| RGB | rgb(16, 23, 51) |
| HSL | hsl(228, 52%, 13%) |
| OKLCH | oklch(21.5% 0.056 270.6) |
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 #101733 | 17.61:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #101733 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #101733 text on white | 17.61:1 | AAA | Lc 104.3 | Preferred for body text |
| #101733 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
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B0BFEC
oklch(80.9% 0.066 270.5)
-
Step 400
400
#889DE3
oklch(70.8% 0.106 270.8)
-
Step 500
500
#6B83DB
oklch(63.1% 0.135 270.6)
-
Step 600
600
#546BC8
oklch(55.6% 0.146 270.6)
-
Step 700
700
#4459AD
oklch(49.2% 0.136 270.2)
-
Step 800
800
#38498C
oklch(42.7% 0.112 270.3)
-
Step 900
900
#303D70
oklch(37.6% 0.089 270.9)
-
Step 950
950 (this color)
#101733
oklch(21.5% 0.056 270.6)
#101733 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) | #0A1A34 | 0.012 |
| Deuteranopia (no green cones) | #061732 | 0.014 |
| Tritanopia (no blue cones) | #001D22 | 0.049 |
| Achromatopsia (no color) | #191919 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101733
#101733
oklch(21.5% 0.056 270.6)
- #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 #101733, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.025
- Navy Blue #001146 ΔE 0.048
- Dark #1B2431 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.056
- Rich Navy #001219 ΔE 0.062
- Jet #212529 ΔE 0.066
- Night Blue #040348 ΔE 0.069
- Dark Navy #000435 ΔE 0.069
Use #101733 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.