#5B5ACB
Closest named color: Iris (#6258C4). oklch(53% 0.171 279.2), rgb(91, 90, 203).
Aa
White text reads best on this color (5.57:1).
About this color
#5B5ACB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.171 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.015 away. White text reads best on it, at 5.57:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.76:1 |
| White text | 5.57:1 |
Values
| HEX | #5B5ACB |
| RGB | rgb(91, 90, 203) |
| HSL | hsl(241, 52%, 57%) |
| OKLCH | oklch(53% 0.171 279.2) |
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 #5B5ACB | 5.57:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #5B5ACB | 3.76:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #5B5ACB text on white | 5.57:1 | AA | Lc 77.5 | Fine for body text |
| #5B5ACB text on black | 3.76:1 | AA large text | Lc -24.3 | 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 600.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F6
oklch(88.6% 0.043 279.7)
-
Step 300
300
#B6BCF2
oklch(80.9% 0.076 279.6)
-
Step 400
400
#9198EC
oklch(70.8% 0.122 279.1)
-
Step 500
500
#777BE6
oklch(63% 0.158 279.2)
-
Step 600
600 (this color)
#5B5ACB
oklch(53% 0.171 279.2)
-
Step 700
700
#5150B7
oklch(49% 0.159 279.2)
-
Step 800
800
#424294
oklch(42.6% 0.131 279.2)
-
Step 900
900
#383976
oklch(37.7% 0.102 279.6)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#5B5ACB 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) | #046DCF | 0.074 |
| Deuteranopia (no green cones) | #0064C9 | 0.072 |
| Tritanopia (no blue cones) | #23748A | 0.147 |
| Achromatopsia (no color) | #686868 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5ACB
#5B5ACB
oklch(53% 0.171 279.2)
- #7C6C00
#7C6C00
oklch(53% 0.11 99)
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 #5B5ACB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.015
- Slate Blue #6A5ACD ΔE 0.023
- Dark Periwinkle #665FD1 ΔE 0.023
- Light Indigo #6D5ACF ΔE 0.028
- Warm Blue #4B57DB ΔE 0.034
- Royal Blue #4169E1 ΔE 0.053
- Bluey Purple #6241C7 ΔE 0.054
- Neon Blue #4361EE ΔE 0.061
Use #5B5ACB 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.