#3F3C73
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.091 283.7), rgb(63, 60, 115).
Aa
White text reads best on this color (9.97:1).
About this color
#3F3C73 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.091 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 9.97:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.10:1 |
| White text | 9.97:1 |
Values
| HEX | #3F3C73 |
| RGB | rgb(63, 60, 115) |
| HSL | hsl(243, 31%, 34%) |
| OKLCH | oklch(38.7% 0.091 283.7) |
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 #3F3C73 | 9.97:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3F3C73 | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #3F3C73 text on white | 9.97:1 | AAA | Lc 93.0 | Preferred for body text |
| #3F3C73 text on black | 2.10:1 | Fails | Lc -9.4 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D5D6F2
oklch(88.4% 0.038 284)
-
Step 300
300
#BABBEC
oklch(80.8% 0.069 283.8)
-
Step 400
400
#9897E3
oklch(70.7% 0.11 283.8)
-
Step 500
500
#807CDB
oklch(63.2% 0.14 283.5)
-
Step 600
600
#6A63C8
oklch(55.6% 0.152 283.4)
-
Step 700
700
#5951AD
oklch(49.1% 0.142 283.8)
-
Step 800
800
#49438C
oklch(42.7% 0.117 284)
-
Step 900
900 (this color)
#3F3C73
oklch(38.7% 0.091 283.7)
-
Step 950
950
#232242
oklch(27.1% 0.058 283.2)
#3F3C73 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) | #274475 | 0.037 |
| Deuteranopia (no green cones) | #244172 | 0.038 |
| Tritanopia (no blue cones) | #2F4752 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3C73
#3F3C73
oklch(38.7% 0.091 283.7)
- #4C4600
#4C4600
oklch(38.8% 0.082 104)
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 #3F3C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.056
- Blueberry #464196 ΔE 0.060
- Cobalt #1E488F ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.064
- Light Navy #155084 ΔE 0.068
- Marine Blue #01386A ΔE 0.072
- Twilight #4E518B ΔE 0.073
Use #3F3C73 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.