#101D31
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.043 258.7), rgb(16, 29, 49).
Aa
White text reads best on this color (16.90:1).
About this color
#101D31 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.043 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.015 away. White text reads best on it, at 16.90:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.90:1 |
Values
| HEX | #101D31 |
| RGB | rgb(16, 29, 49) |
| HSL | hsl(216, 51%, 13%) |
| OKLCH | oklch(23% 0.043 258.7) |
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 #101D31 | 16.90:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #101D31 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #101D31 text on white | 16.90:1 | AAA | Lc 103.8 | Preferred for body text |
| #101D31 text on black | 1.24:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ADC2E2
oklch(80.9% 0.051 258.7)
-
Step 400
400
#82A2D4
oklch(70.7% 0.082 259.2)
-
Step 500
500
#628AC8
oklch(63% 0.104 258.9)
-
Step 600
600
#4873B5
oklch(55.5% 0.114 258.7)
-
Step 700
700
#3A609C
oklch(49% 0.106 259.2)
-
Step 800
800
#304F7E
oklch(42.7% 0.087 258.5)
-
Step 900
900
#2B4266
oklch(37.8% 0.068 259.1)
-
Step 950
950 (this color)
#101D31
oklch(23% 0.043 258.7)
#101D31 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) | #151E32 | 0.009 |
| Deuteranopia (no green cones) | #111B31 | 0.007 |
| Tritanopia (no blue cones) | #002124 | 0.038 |
| Achromatopsia (no color) | #1D1D1D | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101D31
#101D31
oklch(23% 0.043 258.7)
- #281A03
#281A03
oklch(23% 0.043 77.7)
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 #101D31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.015
- Dark #1B2431 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.039
- Jet #212529 ΔE 0.047
- Navy Blue #001146 ΔE 0.062
- Rich Navy #001219 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.076
- Dark Indigo #1F0954 ΔE 0.086
Use #101D31 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.