#3F397E
Closest named color: Dark Slate Blue (#483D8B). oklch(38.9% 0.113 283.8), rgb(63, 57, 126).
Aa
White text reads best on this color (10.01:1).
About this color
#3F397E is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 10.01:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.01:1 |
Values
| HEX | #3F397E |
| RGB | rgb(63, 57, 126) |
| HSL | hsl(245, 38%, 36%) |
| OKLCH | oklch(38.9% 0.113 283.8) |
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 #3F397E | 10.01:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3F397E | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #3F397E text on white | 10.01:1 | AAA | Lc 93.0 | Preferred for body text |
| #3F397E text on black | 2.09:1 | Fails | Lc -9.5 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D4D6F8
oklch(88.5% 0.047 282.7)
-
Step 300
300
#B9BAF6
oklch(80.9% 0.084 283.6)
-
Step 400
400
#9794F2
oklch(70.8% 0.136 283.8)
-
Step 500
500
#7F76ED
oklch(63.1% 0.173 283.7)
-
Step 600
600
#6A5BDB
oklch(55.5% 0.188 283.7)
-
Step 700
700
#594ABE
oklch(49.1% 0.175 283.8)
-
Step 800
800
#483E9A
oklch(42.8% 0.145 283.4)
-
Step 900
900 (this color)
#3F397E
oklch(38.9% 0.113 283.8)
-
Step 950
950
#232048
oklch(27% 0.072 283.9)
#3F397E 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) | #164480 | 0.053 |
| Deuteranopia (no green cones) | #12407D | 0.054 |
| Tritanopia (no blue cones) | #294855 | 0.097 |
| Achromatopsia (no color) | #424242 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F397E
#3F397E
oklch(38.9% 0.113 283.8)
- #4D4600
#4D4600
oklch(38.9% 0.082 103)
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 #3F397E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.045
- Cobalt #1E488F ΔE 0.057
- Twilight Blue #0A437A ΔE 0.060
- Light Navy #155084 ΔE 0.072
- Twilight #4E518B ΔE 0.074
- Dusk Blue #26538D ΔE 0.075
- Marine Blue #01386A ΔE 0.077
Use #3F397E 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.