#3F287D
Closest named color: Indigo (#4B0082). oklch(35.8% 0.136 290.2), rgb(63, 40, 125).
Aa
White text reads best on this color (11.59:1).
About this color
#3F287D is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.136 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.056 away. White text reads best on it, at 11.59:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.136) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #3F287D |
| RGB | rgb(63, 40, 125) |
| HSL | hsl(256, 52%, 32%) |
| OKLCH | oklch(35.8% 0.136 290.2) |
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 #3F287D | 11.59:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #3F287D | 1.81:1 | Fails | Lc 7.7 | Not readable |
| #3F287D text on white | 11.59:1 | AAA | Lc 96.2 | Preferred for body text |
| #3F287D text on black | 1.81:1 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FD
oklch(93.6% 0.03 290)
-
Step 200
200
#D8D3FD
oklch(88.4% 0.058 290.6)
-
Step 300
300
#BFB5FE
oklch(80.8% 0.102 290.2)
-
Step 400
400
#A18BFE
oklch(70.6% 0.164 290.3)
-
Step 500
500
#8D69FC
oklch(63.1% 0.209 290.4)
-
Step 600
600
#794AEB
oklch(55.6% 0.228 290.4)
-
Step 700
700
#663ACD
oklch(49.2% 0.212 290.1)
-
Step 800
800
#5331A5
oklch(42.6% 0.175 290.4)
-
Step 900
900 (this color)
#3F287D
oklch(35.8% 0.136 290.2)
-
Step 950
950
#271C4D
oklch(27% 0.087 289.7)
#3F287D 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) | #003A80 | 0.076 |
| Deuteranopia (no green cones) | #00377B | 0.075 |
| Tritanopia (no blue cones) | #2B3D4F | 0.110 |
| Achromatopsia (no color) | #393939 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F287D
#3F287D
oklch(35.8% 0.136 290.2)
- #3F4000
#3F4000
oklch(35.9% 0.079 110.8)
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 #3F287D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
- Royal Purple #4B006E ΔE 0.068
- Blueberry #464196 ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.077
- Midnight Blue #191970 ΔE 0.082
- Marine Blue #01386A ΔE 0.086
- Twilight Blue #0A437A ΔE 0.086
Use #3F287D 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.