#3F3398
Closest named color: Blueberry (#464196). oklch(39.9% 0.158 281.9), rgb(63, 51, 152).
Aa
White text reads best on this color (9.82:1).
About this color
#3F3398 is a dark, vivid purple. In OKLCH its lightness is 40%, its chroma 0.158 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.037 away. White text reads best on it, at 9.82:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.13:1 |
| White text | 9.82:1 |
Values
| HEX | #3F3398 |
| RGB | rgb(63, 51, 152) |
| HSL | hsl(247, 50%, 40%) |
| OKLCH | oklch(39.9% 0.158 281.9) |
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 #3F3398 | 9.82:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #3F3398 | 2.13:1 | Fails | Lc 11.7 | Not readable |
| #3F3398 text on white | 9.82:1 | AAA | Lc 92.3 | Preferred for body text |
| #3F3398 text on black | 2.13:1 | Fails | Lc -10.2 | 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
#E6E8FF
oklch(93.6% 0.031 281.8)
-
Step 200
200
#D2D5FF
oklch(88.4% 0.058 281.9)
-
Step 300
300
#B6B9FF
oklch(80.9% 0.099 282.1)
-
Step 400
400
#9292FF
oklch(70.8% 0.157 281.6)
-
Step 500
500
#7B71FF
oklch(63.1% 0.204 282)
-
Step 600
600
#6749FF
oklch(55.6% 0.253 281.9)
-
Step 700
700
#5733E3
oklch(49% 0.244 281.9)
-
Step 800
800
#472DB8
oklch(42.7% 0.203 282.1)
-
Step 900
900 (this color)
#3F3398
oklch(39.9% 0.158 281.9)
-
Step 950
950
#211B55
oklch(26.9% 0.101 281.9)
#3F3398 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) | #00479B | 0.067 |
| Deuteranopia (no green cones) | #004096 | 0.062 |
| Tritanopia (no blue cones) | #0C4D61 | 0.134 |
| Achromatopsia (no color) | #434343 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3398
#3F3398
oklch(39.9% 0.158 281.9)
- #514800
#514800
oklch(39.8% 0.083 101.2)
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 #3F3398, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.038
- Sapphire #2138AB ΔE 0.050
- Indigo Blue #3A18B1 ΔE 0.058
- Imperial Purple #480CA8 ΔE 0.058
- Cobalt #1E488F ΔE 0.063
- Chrysanthemum #560BAD ΔE 0.069
- Rebecca Purple #663399 ΔE 0.072
Use #3F3398 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.