#100308
Closest named color: Very Dark Brown (#1D0200). oklch(12.9% 0.031 352.7), rgb(16, 3, 8).
Aa
White text reads best on this color (20.22:1).
About this color
#100308 is a very dark, muted red. In OKLCH its lightness is 13%, its chroma 0.031 and its hue 353°. Its hue sits on the warm side of the wheel. The nearest named color is Very Dark Brown (#1D0200), ΔE 0.043 away. White text reads best on it, at 20.22:1.
| Hue family | Reds |
| Lightness | very dark (13%) |
| Chroma | muted (0.031) |
| Temperature | warm |
| Nearest name | Very Dark Brown (#1D0200) |
| Black text | 1.03:1 |
| White text | 20.22:1 |
Values
| HEX | #100308 |
| RGB | rgb(16, 3, 8) |
| HSL | hsl(337, 68%, 4%) |
| OKLCH | oklch(12.9% 0.031 352.7) |
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 #100308 | 20.22:1 | AAA | Lc -107.8 | Preferred for body text |
| Black text on #100308 | 1.03:1 | Fails | Lc 0.0 | Not readable |
| #100308 text on white | 20.22:1 | AAA | Lc 105.9 | Preferred for body text |
| #100308 text on black | 1.03:1 | 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
#F8F4F6
oklch(97.1% 0.005 345.3)
-
Step 100
100
#F0E7EA
oklch(93.6% 0.011 354.9)
-
Step 200
200
#E5D4DA
oklch(88.5% 0.02 354.1)
-
Step 300
300
#D5B7C3
oklch(80.9% 0.038 351.9)
-
Step 400
400
#BF92A4
oklch(70.8% 0.059 352.9)
-
Step 500
500
#AE768E
oklch(63.1% 0.077 352.2)
-
Step 600
600
#995F78
oklch(55.7% 0.082 352.7)
-
Step 700
700
#824E65
oklch(49.1% 0.076 352.2)
-
Step 800
800
#6A4052
oklch(42.7% 0.064 352.9)
-
Step 900
900
#563644
oklch(37.6% 0.05 352)
-
Step 950
950 (this color)
#100308
oklch(12.9% 0.031 352.7)
#100308 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) | #040508 | 0.035 |
| Deuteranopia (no green cones) | #070708 | 0.031 |
| Tritanopia (no blue cones) | #120305 | 0.010 |
| Achromatopsia (no color) | #060606 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #100308
#100308
oklch(12.9% 0.031 352.7)
- #000A06
#000A06
oklch(12.9% 0.025 171)
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 #100308, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Very Dark Brown #1D0200 ΔE 0.043
- Almost Black #070D0D ΔE 0.047
- Rich Navy #001219 ΔE 0.070
- Midnight #03012D ΔE 0.090
- Dark Navy Blue #00022E ΔE 0.095
- Rich Black #0D1B2A ΔE 0.103
- Very Dark Blue #000133 ΔE 0.104
- Dark Navy #000435 ΔE 0.105
Use #100308 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.