#5B55BB
Closest named color: Iris (#6258C4). oklch(51% 0.156 282), rgb(91, 85, 187).
Aa
White text reads best on this color (6.06:1).
About this color
#5B55BB is a medium-dark, vivid purple. In OKLCH its lightness is 51%, its chroma 0.156 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.019 away. White text reads best on it, at 6.06:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.46:1 |
| White text | 6.06:1 |
Values
| HEX | #5B55BB |
| RGB | rgb(91, 85, 187) |
| HSL | hsl(244, 43%, 53%) |
| OKLCH | oklch(51% 0.156 282) |
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 #5B55BB | 6.06:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #5B55BB | 3.46:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #5B55BB text on white | 6.06:1 | AA | Lc 80.0 | Fine for body text |
| #5B55BB text on black | 3.46:1 | AA large text | Lc -21.8 | Dividers and decoration only |
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 700.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F5
oklch(88.4% 0.043 282.6)
-
Step 300
300
#B8BBF1
oklch(80.8% 0.076 282.1)
-
Step 400
400
#9597EA
oklch(70.8% 0.12 281.8)
-
Step 500
500
#7D7AE3
oklch(63.1% 0.154 282.3)
-
Step 600
600
#6761D1
oklch(55.6% 0.167 281.9)
-
Step 700
700 (this color)
#5B55BB
oklch(51% 0.156 282)
-
Step 800
800
#464292
oklch(42.7% 0.128 281.8)
-
Step 900
900
#3A3875
oklch(37.6% 0.102 281.8)
-
Step 950
950
#222144
oklch(26.9% 0.064 282.5)
#5B55BB 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) | #1966BF | 0.072 |
| Deuteranopia (no green cones) | #0B5FB9 | 0.074 |
| Tritanopia (no blue cones) | #356C80 | 0.133 |
| Achromatopsia (no color) | #626262 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B55BB
#5B55BB
oklch(51% 0.156 282)
- #736700
#736700
oklch(50.9% 0.106 101.4)
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 #5B55BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.019
- Slate Blue #6A5ACD ΔE 0.039
- Light Indigo #6D5ACF ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.045
- Bluey Purple #6241C7 ΔE 0.049
- Warm Blue #4B57DB ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.061
- Blurple #5539CC ΔE 0.068
Use #5B55BB 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.