#5B63CF
Closest named color: Dark Periwinkle (#665FD1). oklch(55% 0.164 276.4), rgb(91, 99, 207).
Aa
White text reads best on this color (5.08:1).
About this color
#5B63CF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.164 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.018 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.13:1 |
| White text | 5.08:1 |
Values
| HEX | #5B63CF |
| RGB | rgb(91, 99, 207) |
| HSL | hsl(236, 55%, 58%) |
| OKLCH | oklch(55% 0.164 276.4) |
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 #5B63CF | 5.08:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #5B63CF | 4.13:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #5B63CF text on white | 5.08:1 | AA | Lc 74.8 | Content text, not long reading |
| #5B63CF text on black | 4.13:1 | AA large text | Lc -26.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F5
oklch(88.4% 0.042 276.6)
-
Step 300
300
#B3BDF1
oklch(80.9% 0.074 276.1)
-
Step 400
400
#8D99EA
oklch(70.6% 0.119 276.5)
-
Step 500
500
#737EE3
oklch(63.1% 0.151 276.5)
-
Step 600
600 (this color)
#5B63CF
oklch(55% 0.164 276.4)
-
Step 700
700
#4D53B5
oklch(49.1% 0.153 276.6)
-
Step 800
800
#3F4593
oklch(42.9% 0.126 276.4)
-
Step 900
900
#353A75
oklch(37.6% 0.1 276.8)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#5B63CF 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) | #2673D3 | 0.059 |
| Deuteranopia (no green cones) | #0C6ACD | 0.064 |
| Tritanopia (no blue cones) | #1A7C8F | 0.146 |
| Achromatopsia (no color) | #6E6E6E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B63CF
#5B63CF
oklch(55% 0.164 276.4)
- #857000
#857000
oklch(54.9% 0.113 96)
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 #5B63CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.028
- Iris #6258C4 ΔE 0.031
- Light Indigo #6D5ACF ΔE 0.032
- Royal Blue #4169E1 ΔE 0.040
- Warm Blue #4B57DB ΔE 0.043
- Neon Blue #4361EE ΔE 0.056
- French Blue #436BAD ΔE 0.067
Use #5B63CF 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.