#5B5BB3
Closest named color: Iris (#6258C4). oklch(51.6% 0.136 280.5), rgb(91, 91, 179).
Aa
White text reads best on this color (5.84:1).
About this color
#5B5BB3 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.136 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.030 away. White text reads best on it, at 5.84:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.59:1 |
| White text | 5.84:1 |
Values
| HEX | #5B5BB3 |
| RGB | rgb(91, 91, 179) |
| HSL | hsl(240, 37%, 53%) |
| OKLCH | oklch(51.6% 0.136 280.5) |
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 #5B5BB3 | 5.84:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #5B5BB3 | 3.59:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #5B5BB3 text on white | 5.84:1 | AA | Lc 79.1 | Fine for body text |
| #5B5BB3 text on black | 3.59:1 | AA large text | Lc -22.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F2
oklch(88.5% 0.037 280.6)
-
Step 300
300
#B8BCEB
oklch(80.8% 0.066 281)
-
Step 400
400
#9499E1
oklch(70.7% 0.105 280.3)
-
Step 500
500
#7B7ED8
oklch(63.1% 0.134 280.4)
-
Step 600
600
#6565C6
oklch(55.5% 0.147 280.5)
-
Step 700
700 (this color)
#5B5BB3
oklch(51.6% 0.136 280.5)
-
Step 800
800
#45458A
oklch(42.7% 0.112 280.6)
-
Step 900
900
#3A3B6F
oklch(37.8% 0.087 280.5)
-
Step 950
950
#222341
oklch(27.1% 0.055 280.6)
#5B5BB3 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) | #3368B6 | 0.053 |
| Deuteranopia (no green cones) | #2C62B1 | 0.055 |
| Tritanopia (no blue cones) | #3A6E7E | 0.119 |
| Achromatopsia (no color) | #656565 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5BB3
#5B5BB3
oklch(51.6% 0.136 280.5)
- #766800
#766800
oklch(51.5% 0.107 100.1)
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 #5B5BB3, closest first.
No curated palette has a color within ΔE 0.04 of #5B5BB3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.050
- French Blue #436BAD ΔE 0.052
- Light Indigo #6D5ACF ΔE 0.052
- Dusky Blue #475F94 ΔE 0.060
- Mid Blue #276AB3 ΔE 0.063
- Warm Blue #4B57DB ΔE 0.068
Use #5B5BB3 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.