#5B3797
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.15 296.9), rgb(91, 55, 151).
Aa
White text reads best on this color (8.61:1).
About this color
#5B3797 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.150 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.022 away. White text reads best on it, at 8.61:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #5B3797 |
| RGB | rgb(91, 55, 151) |
| HSL | hsl(263, 47%, 40%) |
| OKLCH | oklch(43.2% 0.15 296.9) |
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 #5B3797 | 8.61:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #5B3797 | 2.43:1 | Fails | Lc 14.8 | Not readable |
| #5B3797 text on white | 8.61:1 | AAA | Lc 89.1 | Fine for body text |
| #5B3797 text on black | 2.43:1 | Fails | Lc -13.1 | 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 800.
-
Step 50
50
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#EBE7F9
oklch(93.6% 0.024 296.1)
-
Step 200
200
#DCD3F6
oklch(88.5% 0.049 297.2)
-
Step 300
300
#C6B5F3
oklch(80.9% 0.088 297)
-
Step 400
400
#AA8CED
oklch(70.7% 0.141 296.9)
-
Step 500
500
#976CE7
oklch(63.1% 0.18 297.1)
-
Step 600
600
#8250D5
oklch(55.6% 0.195 296.9)
-
Step 700
700
#6E40B9
oklch(49.2% 0.181 296.6)
-
Step 800
800 (this color)
#5B3797
oklch(43.2% 0.15 296.9)
-
Step 900
900
#493077
oklch(37.7% 0.117 296.6)
-
Step 950
950
#2B1D46
oklch(27.1% 0.074 296.9)
#5B3797 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) | #004C9A | 0.104 |
| Deuteranopia (no green cones) | #034B95 | 0.104 |
| Tritanopia (no blue cones) | #4C4C62 | 0.115 |
| Achromatopsia (no color) | #4C4C4C | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3797
#5B3797
oklch(43.2% 0.15 296.9)
- #4D5700
#4D5700
oklch(43.3% 0.1 117.2)
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 #5B3797, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.022
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.041
- Chrysanthemum #560BAD ΔE 0.072
- Twilight #4E518B ΔE 0.072
- Blue With A Hint Of Purple #533CC6 ΔE 0.078
- Bluey Purple #6241C7 ΔE 0.080
- Imperial Purple #480CA8 ΔE 0.082
Use #5B3797 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.