#101331
Closest named color: Rich Black (#0D1B2A). oklch(20.4% 0.059 275.6), rgb(16, 19, 49).
Aa
White text reads best on this color (18.11:1).
About this color
#101331 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.059 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.033 away. White text reads best on it, at 18.11:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.11:1 |
Values
| HEX | #101331 |
| RGB | rgb(16, 19, 49) |
| HSL | hsl(235, 51%, 13%) |
| OKLCH | oklch(20.4% 0.059 275.6) |
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 #101331 | 18.11:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #101331 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #101331 text on white | 18.11:1 | AAA | Lc 104.7 | Preferred for body text |
| #101331 text on black | 1.15:1 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F3
oklch(88.5% 0.038 274.1)
-
Step 300
300
#B3BEEE
oklch(80.9% 0.069 274.7)
-
Step 400
400
#8D9AE6
oklch(70.6% 0.112 275.7)
-
Step 500
500
#7280DE
oklch(63.1% 0.141 275.2)
-
Step 600
600
#5C67CC
oklch(55.6% 0.155 275.5)
-
Step 700
700
#4C55B1
oklch(49.1% 0.145 275.5)
-
Step 800
800
#3E468F
oklch(42.7% 0.119 275.4)
-
Step 900
900
#353B72
oklch(37.6% 0.093 276.3)
-
Step 950
950 (this color)
#101331
oklch(20.4% 0.059 275.6)
#101331 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) | #041732 | 0.020 |
| Deuteranopia (no green cones) | #021530 | 0.021 |
| Tritanopia (no blue cones) | #021A1F | 0.053 |
| Achromatopsia (no color) | #161616 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101331
#101331
oklch(20.4% 0.059 275.6)
- #1D1600
#1D1600
oklch(20.3% 0.042 93.7)
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 #101331, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.033
- Navy Blue #001146 ΔE 0.047
- Rich Navy #001219 ΔE 0.058
- Dark Navy #000435 ΔE 0.059
- Night Blue #040348 ΔE 0.063
- Dark #1B2431 ΔE 0.064
- Midnight Purple #280137 ΔE 0.066
- Midnight #03012D ΔE 0.068
Use #101331 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.