#5B37AE
Closest named color: Rebecca Purple (#663399). oklch(45% 0.179 291.4), rgb(91, 55, 174).
Aa
White text reads best on this color (8.06:1).
About this color
#5B37AE is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.179 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.041 away. White text reads best on it, at 8.06:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.179) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #5B37AE |
| RGB | rgb(91, 55, 174) |
| HSL | hsl(258, 52%, 45%) |
| OKLCH | oklch(45% 0.179 291.4) |
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 #5B37AE | 8.06:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #5B37AE | 2.60:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #5B37AE text on white | 8.06:1 | AAA | Lc 87.3 | Fine for body text |
| #5B37AE text on black | 2.60:1 | Fails | Lc -14.8 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FD
oklch(93.6% 0.03 290)
-
Step 200
200
#D9D3FD
oklch(88.5% 0.058 291.7)
-
Step 300
300
#C1B5FF
oklch(81% 0.104 291.3)
-
Step 400
400
#A38AFF
oklch(70.7% 0.167 291.4)
-
Step 500
500
#8F67FD
oklch(63% 0.213 291.4)
-
Step 600
600
#7C48EC
oklch(55.7% 0.231 291.6)
-
Step 700
700
#6937CE
oklch(49.2% 0.216 291.5)
-
Step 800
800 (this color)
#5B37AE
oklch(45% 0.179 291.4)
-
Step 900
900
#452C84
oklch(37.6% 0.14 291.2)
-
Step 950
950
#281B4D
oklch(26.9% 0.088 291.3)
#5B37AE 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) | #0052B2 | 0.101 |
| Deuteranopia (no green cones) | #004DAC | 0.099 |
| Tritanopia (no blue cones) | #41556E | 0.143 |
| Achromatopsia (no color) | #505050 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B37AE
#5B37AE
oklch(45% 0.179 291.4)
- #585A00
#585A00
oklch(45.1% 0.099 111.3)
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 #5B37AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.041
- Blue With A Hint Of Purple #533CC6 ΔE 0.042
- Bluey Purple #6241C7 ΔE 0.047
- Blurple #5539CC ΔE 0.050
- Blueberry #464196 ΔE 0.056
- Purple Blue #5D21D0 ΔE 0.060
- Chrysanthemum #560BAD ΔE 0.061
- Majorelle Blue #3F37C9 ΔE 0.065
Use #5B37AE 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.