#3C307B
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.122 286), rgb(60, 48, 123).
Aa
White text reads best on this color (11.04:1).
About this color
#3C307B is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 11.04:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.90:1 |
| White text | 11.04:1 |
Values
| HEX | #3C307B |
| RGB | rgb(60, 48, 123) |
| HSL | hsl(250, 44%, 34%) |
| OKLCH | oklch(36.7% 0.122 286) |
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 #3C307B | 11.04:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #3C307B | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #3C307B text on white | 11.04:1 | AAA | Lc 95.2 | Preferred for body text |
| #3C307B text on black | 1.90:1 | Fails | Lc -7.4 | 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 900.
-
Step 50
50
#F4F4FE
oklch(97% 0.013 286.1)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D5D5FA
oklch(88.5% 0.051 285.3)
-
Step 300
300
#BBB8FA
oklch(80.8% 0.093 286.2)
-
Step 400
400
#9A91F7
oklch(70.7% 0.146 286)
-
Step 500
500
#8371F3
oklch(63% 0.188 286)
-
Step 600
600
#6F55E2
oklch(55.5% 0.204 286.1)
-
Step 700
700
#5D44C4
oklch(49% 0.19 286)
-
Step 800
800
#4C399F
oklch(42.7% 0.158 286.2)
-
Step 900
900 (this color)
#3C307B
oklch(36.7% 0.122 286)
-
Step 950
950
#241F4A
oklch(27.1% 0.077 285.3)
#3C307B 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) | #003E7D | 0.065 |
| Deuteranopia (no green cones) | #003A79 | 0.064 |
| Tritanopia (no blue cones) | #264150 | 0.102 |
| Achromatopsia (no color) | #3C3C3C | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C307B
#3C307B
oklch(36.7% 0.122 286)
- #454100
#454100
oklch(36.7% 0.078 105.7)
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 #3C307B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.069
- Cobalt #1E488F ΔE 0.073
- Marine Blue #01386A ΔE 0.073
- Indigo #4B0082 ΔE 0.075
- Prussian Blue #1D3557 ΔE 0.081
- Royal Purple #4B006E ΔE 0.084
Use #3C307B 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.