#3C3789
Closest named color: Dark Slate Blue (#483D8B). oklch(39.1% 0.132 281.1), rgb(60, 55, 137).
Aa
White text reads best on this color (10.00:1).
About this color
#3C3789 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.132 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.027 away. White text reads best on it, at 10.00:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #3C3789 |
| RGB | rgb(60, 55, 137) |
| HSL | hsl(244, 43%, 38%) |
| OKLCH | oklch(39.1% 0.132 281.1) |
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 #3C3789 | 10.00:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #3C3789 | 2.09:1 | Fails | Lc 11.1 | Not readable |
| #3C3789 text on white | 10.00:1 | AAA | Lc 92.9 | Preferred for body text |
| #3C3789 text on black | 2.09:1 | Fails | Lc -9.6 | 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
#F4F5FF
oklch(97.2% 0.013 281.6)
-
Step 100
100
#E6E8FD
oklch(93.6% 0.028 281.5)
-
Step 200
200
#D2D6FE
oklch(88.6% 0.055 280.7)
-
Step 300
300
#B5BAFF
oklch(81% 0.097 280.8)
-
Step 400
400
#9192FF
oklch(70.7% 0.157 281.2)
-
Step 500
500
#7972FF
oklch(63.2% 0.203 281.1)
-
Step 600
600
#6555EE
oklch(55.7% 0.22 281.2)
-
Step 700
700
#5444CF
oklch(49.1% 0.204 281)
-
Step 800
800
#4439A7
oklch(42.7% 0.169 281)
-
Step 900
900 (this color)
#3C3789
oklch(39.1% 0.132 281.1)
-
Step 950
950
#211F4E
oklch(27.1% 0.084 281.1)
#3C3789 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) | #00458C | 0.059 |
| Deuteranopia (no green cones) | #003F87 | 0.057 |
| Tritanopia (no blue cones) | #184A5A | 0.113 |
| Achromatopsia (no color) | #424242 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C3789
#3C3789
oklch(39.1% 0.132 281.1)
- #4F4600
#4F4600
oklch(39.1% 0.082 101)
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 #3C3789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.027
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.052
- Twilight Blue #0A437A ΔE 0.064
- Sapphire #2138AB ΔE 0.065
- Light Navy #155084 ΔE 0.076
- Dusk Blue #26538D ΔE 0.076
- Twilight #4E518B ΔE 0.079
Use #3C3789 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.