#101538
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.068 273.2), rgb(16, 21, 56).
Aa
White text reads best on this color (17.70:1).
About this color
#101538 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.068 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.037 away. White text reads best on it, at 17.70:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.70:1 |
Values
| HEX | #101538 |
| RGB | rgb(16, 21, 56) |
| HSL | hsl(233, 56%, 14%) |
| OKLCH | oklch(21.5% 0.068 273.2) |
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 #101538 | 17.70:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #101538 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #101538 text on white | 17.70:1 | AAA | Lc 104.4 | Preferred for body text |
| #101538 text on black | 1.18:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F7
oklch(88.5% 0.044 272.7)
-
Step 300
300
#AFBEF5
oklch(80.9% 0.08 272.7)
-
Step 400
400
#879AF0
oklch(70.7% 0.128 273.3)
-
Step 500
500
#6B7EEB
oklch(63.1% 0.164 273.4)
-
Step 600
600
#5465DA
oklch(55.7% 0.178 273)
-
Step 700
700
#4553BD
oklch(49.2% 0.166 273)
-
Step 800
800
#394499
oklch(42.7% 0.138 273.5)
-
Step 900
900
#303A79
oklch(37.6% 0.107 273.4)
-
Step 950
950 (this color)
#101538
oklch(21.5% 0.068 273.2)
#101538 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) | #021A39 | 0.022 |
| Deuteranopia (no green cones) | #001737 | 0.022 |
| Tritanopia (no blue cones) | #001D24 | 0.057 |
| Achromatopsia (no color) | #181818 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #101538
#101538
oklch(21.5% 0.068 273.2)
- #201900
#201900
oklch(21.6% 0.044 94.9)
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 #101538, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.037
- Navy Blue #001146 ΔE 0.038
- Night Blue #040348 ΔE 0.058
- Dark #1B2431 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.061
- Dark Indigo #1F0954 ΔE 0.062
- Dark Navy #000435 ΔE 0.063
- Midnight Purple #280137 ΔE 0.067
Use #101538 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.