#5B63D3
Closest named color: Dark Periwinkle (#665FD1). oklch(55.3% 0.17 276.2), rgb(91, 99, 211).
Aa
White text reads best on this color (5.03:1).
About this color
#5B63D3 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.170 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.017 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #5B63D3 |
| RGB | rgb(91, 99, 211) |
| HSL | hsl(236, 58%, 59%) |
| OKLCH | oklch(55.3% 0.17 276.2) |
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 #5B63D3 | 5.03:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #5B63D3 | 4.17:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #5B63D3 text on white | 5.03:1 | AA | Lc 74.5 | Content text, not long reading |
| #5B63D3 text on black | 4.17:1 | AA large text | Lc -27.2 | 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 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D1D7F6
oklch(88.4% 0.043 276.8)
-
Step 300
300
#B3BDF2
oklch(80.9% 0.076 276.3)
-
Step 400
400
#8C99EC
oklch(70.7% 0.122 276)
-
Step 500
500
#727DE6
oklch(63% 0.157 276.4)
-
Step 600
600 (this color)
#5B63D3
oklch(55.3% 0.17 276.2)
-
Step 700
700
#4C52B8
oklch(49.1% 0.158 276.3)
-
Step 800
800
#3E4495
oklch(42.7% 0.131 276.2)
-
Step 900
900
#343A76
oklch(37.6% 0.101 276.1)
-
Step 950
950
#1E2245
oklch(26.8% 0.065 276.2)
#5B63D3 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) | #1F74D7 | 0.062 |
| Deuteranopia (no green cones) | #006AD1 | 0.066 |
| Tritanopia (no blue cones) | #107D91 | 0.150 |
| Achromatopsia (no color) | #6F6F6F | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B63D3
#5B63D3
oklch(55.3% 0.17 276.2)
- #867100
#867100
oklch(55.2% 0.114 96.1)
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 #5B63D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.017
- Slate Blue #6A5ACD ΔE 0.029
- Light Indigo #6D5ACF ΔE 0.032
- Iris #6258C4 ΔE 0.034
- Royal Blue #4169E1 ΔE 0.037
- Warm Blue #4B57DB ΔE 0.040
- Neon Blue #4361EE ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.064
Use #5B63D3 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.