#372F8E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.151 280.1), rgb(55, 47, 142).
Aa
White text reads best on this color (10.71:1).
About this color
#372F8E is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.151 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 10.71:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.71:1 |
Values
| HEX | #372F8E |
| RGB | rgb(55, 47, 142) |
| HSL | hsl(245, 50%, 37%) |
| OKLCH | oklch(37.7% 0.151 280.1) |
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 #372F8E | 10.71:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #372F8E | 1.95:1 | Fails | Lc 9.6 | Not readable |
| #372F8E text on white | 10.71:1 | AAA | Lc 94.3 | Preferred for body text |
| #372F8E text on black | 1.95:1 | Fails | Lc -8.3 | 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
#8F93FF
oklch(70.7% 0.156 280)
-
Step 500
500
#7773FF
oklch(63.2% 0.202 280.2)
-
Step 600
600
#624CFF
oklch(55.6% 0.251 280)
-
Step 700
700
#523ADF
oklch(49.1% 0.234 279.9)
-
Step 800
800
#4332B4
oklch(42.7% 0.194 280.2)
-
Step 900
900 (this color)
#372F8E
oklch(37.7% 0.151 280.1)
-
Step 950
950
#201D53
oklch(27% 0.095 280.4)
#372F8E 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) | #004191 | 0.059 |
| Deuteranopia (no green cones) | #003A8C | 0.054 |
| Tritanopia (no blue cones) | #00475A | 0.127 |
| Achromatopsia (no color) | #3E3E3E | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #372F8E
#372F8E
oklch(37.7% 0.151 280.1)
- #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 #372F8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.054
- Sapphire #2138AB ΔE 0.057
- Indigo Blue #3A18B1 ΔE 0.064
- Imperial Purple #480CA8 ΔE 0.064
- Cobalt #1E488F ΔE 0.065
- Twilight Blue #0A437A ΔE 0.074
- Indigo #4B0082 ΔE 0.078
Use #372F8E 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.