#3F237D
Closest named color: Indigo (#4B0082). oklch(35% 0.143 291.5), rgb(63, 35, 125).
Aa
White text reads best on this color (12.01:1).
About this color
#3F237D is a dark, vivid purple. In OKLCH its lightness is 35%, its chroma 0.143 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.047 away. White text reads best on it, at 12.01:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.74:1 |
| White text | 12.01:1 |
Values
| HEX | #3F237D |
| RGB | rgb(63, 35, 125) |
| HSL | hsl(259, 56%, 31%) |
| OKLCH | oklch(35% 0.143 291.5) |
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 #3F237D | 12.01:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #3F237D | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #3F237D text on white | 12.01:1 | AAA | Lc 96.9 | Preferred for body text |
| #3F237D text on black | 1.74:1 | 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
#F5F4FF
oklch(97.1% 0.015 290.3)
-
Step 100
100
#EAE7FE
oklch(93.7% 0.031 291.8)
-
Step 200
200
#D9D3FE
oklch(88.5% 0.059 291.5)
-
Step 300
300
#C1B5FF
oklch(81% 0.104 291.3)
-
Step 400
400
#A38AFF
oklch(70.7% 0.167 291.4)
-
Step 500
500
#9066FF
oklch(63.1% 0.217 291.6)
-
Step 600
600
#7C45F0
oklch(55.6% 0.239 291.3)
-
Step 700
700
#6934D1
oklch(49.1% 0.222 291.3)
-
Step 800
800
#552DA8
oklch(42.6% 0.183 291.5)
-
Step 900
900 (this color)
#3F237D
oklch(35% 0.143 291.5)
-
Step 950
950
#281B4E
oklch(27% 0.09 290.9)
#3F237D 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) | #003880 | 0.080 |
| Deuteranopia (no green cones) | #00347B | 0.079 |
| Tritanopia (no blue cones) | #2B3A4D | 0.114 |
| Achromatopsia (no color) | #363636 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F237D
#3F237D
oklch(35% 0.143 291.5)
- #3C3E00
#3C3E00
oklch(35% 0.077 111.8)
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 #3F237D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.047
- Royal Purple #4B006E ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.068
- Imperial Purple #480CA8 ΔE 0.074
- Midnight Blue #191970 ΔE 0.078
- Blueberry #464196 ΔE 0.082
- Indigo Blue #3A18B1 ΔE 0.088
- Chrysanthemum #560BAD ΔE 0.089
Use #3F237D 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.