#391BA7
Closest named color: Indigo Blue (#3A18B1). oklch(37.7% 0.202 280.5), rgb(57, 27, 167).
Aa
White text reads best on this color (11.11:1).
About this color
#391BA7 is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.202 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Indigo Blue (#3A18B1), ΔE 0.016 away. White text reads best on it, at 11.11:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.202) |
| Temperature | cool |
| Nearest name | Indigo Blue (#3A18B1) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #391BA7 |
| RGB | rgb(57, 27, 167) |
| HSL | hsl(253, 72%, 38%) |
| OKLCH | oklch(37.7% 0.202 280.5) |
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 #391BA7 | 11.11:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #391BA7 | 1.88:1 | Fails | Lc 9.5 | Not readable |
| #391BA7 text on white | 11.11:1 | AAA | Lc 94.4 | Preferred for body text |
| #391BA7 text on black | 1.88:1 | Fails | Lc -8.2 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D1D6FF
oklch(88.5% 0.057 279.7)
-
Step 300
300
#B4BAFF
oklch(80.9% 0.098 280.1)
-
Step 400
400
#9093FF
oklch(70.8% 0.156 280.4)
-
Step 500
500
#7772FF
oklch(63% 0.203 280.4)
-
Step 600
600
#634BFF
oklch(55.5% 0.252 280.4)
-
Step 700
700
#5702FF
oklch(49.1% 0.295 280.5)
-
Step 800
800
#4700D4
oklch(42.7% 0.257 280.6)
-
Step 900
900 (this color)
#391BA7
oklch(37.7% 0.202 280.5)
-
Step 950
950
#201462
oklch(27% 0.129 280.4)
#391BA7 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) | #0040AB | 0.077 |
| Deuteranopia (no green cones) | #0036A5 | 0.064 |
| Tritanopia (no blue cones) | #004863 | 0.162 |
| Achromatopsia (no color) | #3B3B3B | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #391BA7
#391BA7
oklch(37.7% 0.202 280.5)
- #4B4200
#4B4200
oklch(37.7% 0.078 100.6)
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 #391BA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo Blue #3A18B1 ΔE 0.016
- Imperial Purple #480CA8 ΔE 0.030
- Ultramarine #2000B1 ΔE 0.053
- Sapphire #2138AB ΔE 0.055
- Chrysanthemum #560BAD ΔE 0.057
- Violet Blue #510AC9 ΔE 0.068
- Royal #0C1793 ΔE 0.074
- Cobalt Blue #030AA7 ΔE 0.075
Use #391BA7 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.