#5B5BB9
Closest named color: Iris (#6258C4). oklch(52% 0.144 280.1), rgb(91, 91, 185).
Aa
White text reads best on this color (5.76:1).
About this color
#5B5BB9 is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.144 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.022 away. White text reads best on it, at 5.76:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.64:1 |
| White text | 5.76:1 |
Values
| HEX | #5B5BB9 |
| RGB | rgb(91, 91, 185) |
| HSL | hsl(240, 40%, 54%) |
| OKLCH | oklch(52% 0.144 280.1) |
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 #5B5BB9 | 5.76:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #5B5BB9 | 3.64:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #5B5BB9 text on white | 5.76:1 | AA | Lc 78.6 | Fine for body text |
| #5B5BB9 text on black | 3.64:1 | AA large text | Lc -23.2 | 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
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F3
oklch(88.6% 0.039 280.7)
-
Step 300
300
#B7BCEE
oklch(80.8% 0.071 280.2)
-
Step 400
400
#9398E5
oklch(70.6% 0.112 280.3)
-
Step 500
500
#7A7DDD
oklch(63.1% 0.142 280.1)
-
Step 600
600
#6464CB
oklch(55.5% 0.156 280.1)
-
Step 700
700 (this color)
#5B5BB9
oklch(52% 0.144 280.1)
-
Step 800
800
#44448E
oklch(42.7% 0.119 280.1)
-
Step 900
900
#393A72
oklch(37.7% 0.094 280.1)
-
Step 950
950
#212242
oklch(26.9% 0.059 280.3)
#5B5BB9 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) | #2D69BC | 0.057 |
| Deuteranopia (no green cones) | #2462B7 | 0.060 |
| Tritanopia (no blue cones) | #367081 | 0.126 |
| Achromatopsia (no color) | #666666 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5BB9
#5B5BB9
oklch(52% 0.144 280.1)
- #776900
#776900
oklch(51.8% 0.108 100.1)
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 #5B5BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.022
- Slate Blue #6A5ACD ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.042
- Light Indigo #6D5ACF ΔE 0.044
- French Blue #436BAD ΔE 0.055
- Warm Blue #4B57DB ΔE 0.059
- Bluey Purple #6241C7 ΔE 0.064
- Mid Blue #276AB3 ΔE 0.065
Use #5B5BB9 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.