#5B63B5
Closest named color: French Blue (#436BAD). oklch(53.3% 0.128 276.9), rgb(91, 99, 181).
Aa
White text reads best on this color (5.38:1).
About this color
#5B63B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.128 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.038 away. White text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #5B63B5 |
| RGB | rgb(91, 99, 181) |
| HSL | hsl(235, 38%, 53%) |
| OKLCH | oklch(53.3% 0.128 276.9) |
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 #5B63B5 | 5.38:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #5B63B5 | 3.89:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #5B63B5 text on white | 5.38:1 | AA | Lc 76.7 | Fine for body text |
| #5B63B5 text on black | 3.89:1 | AA large text | Lc -25.0 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B7BEE6
oklch(80.9% 0.057 277.3)
-
Step 400
400
#929BDA
oklch(70.6% 0.093 277.5)
-
Step 500
500
#7882D0
oklch(63.2% 0.117 276.9)
-
Step 600
600 (this color)
#5B63B5
oklch(53.3% 0.128 276.9)
-
Step 700
700
#5158A3
oklch(49.2% 0.119 277.1)
-
Step 800
800
#424884
oklch(42.7% 0.099 277)
-
Step 900
900
#383D6A
oklch(37.8% 0.077 277.3)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#5B63B5 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) | #416EB8 | 0.039 |
| Deuteranopia (no green cones) | #3967B3 | 0.040 |
| Tritanopia (no blue cones) | #387483 | 0.111 |
| Achromatopsia (no color) | #6A6A6A | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B63B5
#5B63B5
oklch(53.3% 0.128 276.9)
- #7F6C00
#7F6C00
oklch(53.3% 0.11 96.9)
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 #5B63B5, closest first.
No curated palette has a color within ΔE 0.04 of #5B63B5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.038
- Iris #6258C4 ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.050
- Light Indigo #6D5ACF ΔE 0.055
- Mid Blue #276AB3 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.061
Use #5B63B5 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.