#101333
Closest named color: Rich Black (#0D1B2A). oklch(20.5% 0.062 275.4), rgb(16, 19, 51).
Aa
White text reads best on this color (18.05:1).
About this color
#101333 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.062 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.035 away. White text reads best on it, at 18.05:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.05:1 |
Values
| HEX | #101333 |
| RGB | rgb(16, 19, 51) |
| HSL | hsl(235, 52%, 13%) |
| OKLCH | oklch(20.5% 0.062 275.4) |
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 #101333 | 18.05:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #101333 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #101333 text on white | 18.05:1 | AAA | Lc 104.7 | Preferred for body text |
| #101333 text on black | 1.16:1 | 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
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D1D8F5
oklch(88.6% 0.041 274.8)
-
Step 300
300
#B3BDF1
oklch(80.9% 0.074 276.1)
-
Step 400
400
#8C9AEA
oklch(70.8% 0.118 275.4)
-
Step 500
500
#717FE3
oklch(63.2% 0.15 275.3)
-
Step 600
600
#5B65D1
oklch(55.5% 0.164 275.7)
-
Step 700
700
#4B54B5
oklch(49.2% 0.152 275.3)
-
Step 800
800
#3D4593
oklch(42.7% 0.127 275.3)
-
Step 900
900
#343B75
oklch(37.8% 0.098 275.5)
-
Step 950
950 (this color)
#101333
oklch(20.5% 0.062 275.4)
#101333 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) | #031834 | 0.022 |
| Deuteranopia (no green cones) | #001532 | 0.024 |
| Tritanopia (no blue cones) | #001A20 | 0.055 |
| Achromatopsia (no color) | #161616 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101333
#101333
oklch(20.5% 0.062 275.4)
- #1D1700
#1D1700
oklch(20.6% 0.042 96.4)
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 #101333, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.035
- Navy Blue #001146 ΔE 0.044
- Dark Navy #000435 ΔE 0.058
- Night Blue #040348 ΔE 0.060
- Rich Navy #001219 ΔE 0.062
- Dark #1B2431 ΔE 0.064
- Midnight Purple #280137 ΔE 0.065
- Oxford Blue #1B263B ΔE 0.068
Use #101333 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.