#3F277B
Closest named color: Indigo (#4B0082). oklch(35.4% 0.135 291), rgb(63, 39, 123).
Aa
White text reads best on this color (11.74:1).
About this color
#3F277B is a dark, moderately saturated purple. In OKLCH its lightness is 35%, its chroma 0.135 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.055 away. White text reads best on it, at 11.74:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #3F277B |
| RGB | rgb(63, 39, 123) |
| HSL | hsl(257, 52%, 32%) |
| OKLCH | oklch(35.4% 0.135 291) |
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 #3F277B | 11.74:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #3F277B | 1.78:1 | Fails | Lc 7.4 | Not readable |
| #3F277B text on white | 11.74:1 | AAA | Lc 96.5 | Preferred for body text |
| #3F277B text on black | 1.78:1 | 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
#D9D3FC
oklch(88.5% 0.056 291.9)
-
Step 300
300
#C0B5FD
oklch(80.8% 0.101 291)
-
Step 400
400
#A28BFD
oklch(70.6% 0.163 290.9)
-
Step 500
500
#8E69FA
oklch(63.1% 0.207 291)
-
Step 600
600
#7A4BE9
oklch(55.6% 0.224 290.9)
-
Step 700
700
#673ACB
oklch(49.1% 0.209 290.8)
-
Step 800
800
#5431A4
oklch(42.6% 0.174 291.2)
-
Step 900
900 (this color)
#3F277B
oklch(35.4% 0.135 291)
-
Step 950
950
#281C4C
oklch(27% 0.085 291.2)
#3F277B 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) | #00397E | 0.077 |
| Deuteranopia (no green cones) | #003679 | 0.076 |
| Tritanopia (no blue cones) | #2C3B4D | 0.108 |
| Achromatopsia (no color) | #383838 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F277B
#3F277B
oklch(35.4% 0.135 291)
- #3E3F00
#3E3F00
oklch(35.5% 0.078 110.8)
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 #3F277B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.062
- Royal Purple #4B006E ΔE 0.065
- Blueberry #464196 ΔE 0.077
- Imperial Purple #480CA8 ΔE 0.080
- Midnight Blue #191970 ΔE 0.080
- Marine Blue #01386A ΔE 0.086
- Twilight Blue #0A437A ΔE 0.088
Use #3F277B 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.