#3C3370
Closest named color: Dark Slate Blue (#483D8B). oklch(36.4% 0.102 287), rgb(60, 51, 112).
Aa
White text reads best on this color (11.05:1).
About this color
#3C3370 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.102 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.055 away. White text reads best on it, at 11.05:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #3C3370 |
| RGB | rgb(60, 51, 112) |
| HSL | hsl(249, 37%, 32%) |
| OKLCH | oklch(36.4% 0.102 287) |
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 #3C3370 | 11.05:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #3C3370 | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #3C3370 text on white | 11.05:1 | AAA | Lc 95.4 | Preferred for body text |
| #3C3370 text on black | 1.89:1 | 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 900.
-
Step 50
50
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D7D6F4
oklch(88.6% 0.041 287.1)
-
Step 300
300
#BDBAF0
oklch(81% 0.076 287.1)
-
Step 400
400
#9C94E8
oklch(70.7% 0.121 287.2)
-
Step 500
500
#8577E2
oklch(63.1% 0.157 287)
-
Step 600
600
#705DCF
oklch(55.5% 0.169 287.2)
-
Step 700
700
#5E4CB4
oklch(49.1% 0.158 287)
-
Step 800
800
#4C3F91
oklch(42.6% 0.13 286.8)
-
Step 900
900 (this color)
#3C3370
oklch(36.4% 0.102 287)
-
Step 950
950
#252044
oklch(26.9% 0.065 287.6)
#3C3370 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) | #173D72 | 0.052 |
| Deuteranopia (no green cones) | #163A6F | 0.051 |
| Tritanopia (no blue cones) | #2C404C | 0.085 |
| Achromatopsia (no color) | #3C3C3C | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C3370
#3C3370
oklch(36.4% 0.102 287)
- #434000
#434000
oklch(36.3% 0.078 106.7)
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 #3C3370, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.055
- Twilight Blue #0A437A ΔE 0.064
- Marine Blue #01386A ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.065
- Blueberry #464196 ΔE 0.073
- Cobalt #1E488F ΔE 0.077
- Dark Grey Blue #29465B ΔE 0.077
- Marine #042E60 ΔE 0.078
Use #3C3370 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.