#5B64C5
Closest named color: Dark Periwinkle (#665FD1). oklch(54.5% 0.149 276.3), rgb(91, 100, 197).
Aa
White text reads best on this color (5.15:1).
About this color
#5B64C5 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.149 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.027 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #5B64C5 |
| RGB | rgb(91, 100, 197) |
| HSL | hsl(235, 48%, 56%) |
| OKLCH | oklch(54.5% 0.149 276.3) |
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 #5B64C5 | 5.15:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #5B64C5 | 4.07:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #5B64C5 text on white | 5.15:1 | AA | Lc 75.3 | Fine for body text |
| #5B64C5 text on black | 4.07:1 | AA large text | Lc -26.4 | 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
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8F9AE3
oklch(70.6% 0.107 276.7)
-
Step 500
500
#7480DB
oklch(63.1% 0.137 276.1)
-
Step 600
600 (this color)
#5B64C5
oklch(54.5% 0.149 276.3)
-
Step 700
700
#4E55AE
oklch(49.1% 0.14 276.6)
-
Step 800
800
#40468C
oklch(42.6% 0.114 276.7)
-
Step 900
900
#363C70
oklch(37.8% 0.088 276.3)
-
Step 950
950
#1F2342
oklch(26.9% 0.058 276.3)
#5B64C5 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) | #3572C9 | 0.050 |
| Deuteranopia (no green cones) | #2869C3 | 0.052 |
| Tritanopia (no blue cones) | #29798B | 0.130 |
| Achromatopsia (no color) | #6D6D6D | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B64C5
#5B64C5
oklch(54.5% 0.149 276.3)
- #836F00
#836F00
oklch(54.4% 0.112 96.6)
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 #5B64C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.027
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.038
- Royal Blue #4169E1 ΔE 0.051
- French Blue #436BAD ΔE 0.053
- Warm Blue #4B57DB ΔE 0.054
- Mid Blue #276AB3 ΔE 0.063
Use #5B64C5 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.