#10102C
Closest named color: Rich Black (#0D1B2A). oklch(19.2% 0.055 279.9), rgb(16, 16, 44).
Aa
White text reads best on this color (18.54:1).
About this color
#10102C is a very dark, muted blue. In OKLCH its lightness is 19%, its chroma 0.055 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.039 away. White text reads best on it, at 18.54:1.
| Hue family | Blues |
| Lightness | very dark (19%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.13:1 |
| White text | 18.54:1 |
Values
| HEX | #10102C |
| RGB | rgb(16, 16, 44) |
| HSL | hsl(240, 47%, 12%) |
| OKLCH | oklch(19.2% 0.055 279.9) |
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 #10102C | 18.54:1 | AAA | Lc -107.1 | Preferred for body text |
| Black text on #10102C | 1.13:1 | Fails | Lc 0.0 | Not readable |
| #10102C text on white | 18.54:1 | AAA | Lc 105.0 | Preferred for body text |
| #10102C text on black | 1.13:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F1
oklch(88.5% 0.036 280.4)
-
Step 300
300
#B8BDEB
oklch(81% 0.065 280)
-
Step 400
400
#9499E1
oklch(70.7% 0.105 280.3)
-
Step 500
500
#7A7ED8
oklch(63% 0.134 279.9)
-
Step 600
600
#6466C5
oklch(55.5% 0.144 279.7)
-
Step 700
700
#5454AB
oklch(49.1% 0.136 280.2)
-
Step 800
800
#44458A
oklch(42.6% 0.112 279.9)
-
Step 900
900
#393B6E
oklch(37.7% 0.086 279.7)
-
Step 950
950 (this color)
#10102C
oklch(19.2% 0.055 279.9)
#10102C 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) | #04142D | 0.021 |
| Deuteranopia (no green cones) | #02122B | 0.023 |
| Tritanopia (no blue cones) | #05161B | 0.048 |
| Achromatopsia (no color) | #131313 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10102C
#10102C
oklch(19.2% 0.055 279.9)
- #181400
#181400
oklch(19% 0.04 100.1)
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 #10102C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.039
- Rich Navy #001219 ΔE 0.052
- Dark Navy #000435 ΔE 0.055
- Navy Blue #001146 ΔE 0.055
- Midnight #03012D ΔE 0.061
- Dark Navy Blue #00022E ΔE 0.063
- Very Dark Blue #000133 ΔE 0.065
- Midnight Purple #280137 ΔE 0.066
Use #10102C 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.