#3F2571
Closest named color: Royal Purple (#4B006E). oklch(34.3% 0.125 294.7), rgb(63, 37, 113).
Aa
White text reads best on this color (12.24:1).
About this color
#3F2571 is a dark, moderately saturated purple. In OKLCH its lightness is 34%, its chroma 0.125 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Royal Purple (#4B006E), ΔE 0.057 away. White text reads best on it, at 12.24:1.
| Hue family | Purples |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.125) |
| Temperature | in between |
| Nearest name | Royal Purple (#4B006E) |
| Black text | 1.71:1 |
| White text | 12.24:1 |
Values
| HEX | #3F2571 |
| RGB | rgb(63, 37, 113) |
| HSL | hsl(261, 51%, 29%) |
| OKLCH | oklch(34.3% 0.125 294.7) |
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 #3F2571 | 12.24:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #3F2571 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #3F2571 text on white | 12.24:1 | AAA | Lc 97.5 | Preferred for body text |
| #3F2571 text on black | 1.71:1 | 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
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#EBE7FB
oklch(93.7% 0.027 295)
-
Step 200
200
#DBD3F9
oklch(88.5% 0.052 295)
-
Step 300
300
#C4B5F7
oklch(80.9% 0.093 294.7)
-
Step 400
400
#A88CF3
oklch(70.8% 0.149 294.8)
-
Step 500
500
#946BEF
oklch(63.2% 0.191 294.6)
-
Step 600
600
#804EDD
oklch(55.7% 0.207 294.8)
-
Step 700
700
#6C3DC0
oklch(49.1% 0.193 294.7)
-
Step 800
800
#58349B
oklch(42.7% 0.159 294.8)
-
Step 900
900 (this color)
#3F2571
oklch(34.3% 0.125 294.7)
-
Step 950
950
#2A1C48
oklch(26.9% 0.079 295.3)
#3F2571 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) | #003673 | 0.080 |
| Deuteranopia (no green cones) | #00346F | 0.080 |
| Tritanopia (no blue cones) | #323747 | 0.099 |
| Achromatopsia (no color) | #353535 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2571
#3F2571
oklch(34.3% 0.125 294.7)
- #383D00
#383D00
oklch(34.3% 0.078 114.8)
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 #3F2571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Purple #4B006E ΔE 0.057
- Indigo #4B0082 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.074
- Midnight Blue #191970 ΔE 0.077
- Plum Purple #4E0550 ΔE 0.083
- Prussian Blue #1D3557 ΔE 0.083
- Marine Blue #01386A ΔE 0.085
- Marine #042E60 ΔE 0.086
Use #3F2571 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.