#37317C
Closest named color: Dark Slate Blue (#483D8B). oklch(36.5% 0.123 282), rgb(55, 49, 124).
Aa
White text reads best on this color (11.09:1).
About this color
#37317C is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.123 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.050 away. White text reads best on it, at 11.09:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #37317C |
| RGB | rgb(55, 49, 124) |
| HSL | hsl(245, 43%, 34%) |
| OKLCH | oklch(36.5% 0.123 282) |
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 #37317C | 11.09:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #37317C | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #37317C text on white | 11.09:1 | AAA | Lc 95.3 | Preferred for body text |
| #37317C text on black | 1.89:1 | Fails | Lc -7.3 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D3D6FB
oklch(88.6% 0.051 281.6)
-
Step 300
300
#B7BAFB
oklch(81% 0.092 282.1)
-
Step 400
400
#9393F9
oklch(70.7% 0.147 282)
-
Step 500
500
#7B74F6
oklch(63% 0.188 282)
-
Step 600
600
#6758E5
oklch(55.6% 0.205 282.2)
-
Step 700
700
#5647C7
oklch(49.1% 0.191 282.1)
-
Step 800
800
#463BA1
oklch(42.6% 0.158 282.2)
-
Step 900
900 (this color)
#37317C
oklch(36.5% 0.123 282)
-
Step 950
950
#221F4B
oklch(27% 0.079 282.8)
#37317C 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) | #003E7E | 0.057 |
| Deuteranopia (no green cones) | #00397A | 0.055 |
| Tritanopia (no blue cones) | #194351 | 0.106 |
| Achromatopsia (no color) | #3C3C3C | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37317C
#37317C
oklch(36.5% 0.123 282)
- #473F00
#473F00
oklch(36.5% 0.076 101.3)
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 #37317C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.050
- Twilight Blue #0A437A ΔE 0.062
- Blueberry #464196 ΔE 0.065
- Marine Blue #01386A ΔE 0.066
- Cobalt #1E488F ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.077
- Marine #042E60 ΔE 0.080
- Indigo #4B0082 ΔE 0.080
Use #37317C 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.