#101838
Closest named color: Rich Black (#0D1B2A). oklch(22.2% 0.063 270.1), rgb(16, 24, 56).
Aa
White text reads best on this color (17.35:1).
About this color
#101838 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.063 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.032 away. White text reads best on it, at 17.35:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.35:1 |
Values
| HEX | #101838 |
| RGB | rgb(16, 24, 56) |
| HSL | hsl(228, 56%, 14%) |
| OKLCH | oklch(22.2% 0.063 270.1) |
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 #101838 | 17.35:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #101838 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #101838 text on white | 17.35:1 | AAA | Lc 104.1 | Preferred for body text |
| #101838 text on black | 1.20:1 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED8F5
oklch(88.4% 0.041 270.4)
-
Step 300
300
#AEBFF2
oklch(80.9% 0.075 270.3)
-
Step 400
400
#849CEB
oklch(70.7% 0.119 270.3)
-
Step 500
500
#6681E5
oklch(63% 0.153 270.2)
-
Step 600
600
#4F69D3
oklch(55.7% 0.165 269.9)
-
Step 700
700
#4056B7
oklch(49% 0.155 270.1)
-
Step 800
800
#354794
oklch(42.7% 0.128 270.3)
-
Step 900
900
#2D3C76
oklch(37.6% 0.101 270.1)
-
Step 950
950 (this color)
#101838
oklch(22.2% 0.063 270.1)
#101838 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) | #081C39 | 0.015 |
| Deuteranopia (no green cones) | #021937 | 0.018 |
| Tritanopia (no blue cones) | #001F25 | 0.053 |
| Achromatopsia (no color) | #1A1A1A | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101838
#101838
oklch(22.2% 0.063 270.1)
- #231A00
#231A00
oklch(22.2% 0.045 91.1)
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 #101838, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.032
- Navy Blue #001146 ΔE 0.042
- Dark #1B2431 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.052
- Night Blue #040348 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.066
- Jet #212529 ΔE 0.067
- Dark Navy #000435 ΔE 0.071
Use #101838 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.