#5663CE
Closest named color: Dark Periwinkle (#665FD1). oklch(54.6% 0.164 274.4), rgb(86, 99, 206).
Aa
White text reads best on this color (5.15:1).
About this color
#5663CE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.164 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.024 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #5663CE |
| RGB | rgb(86, 99, 206) |
| HSL | hsl(234, 55%, 57%) |
| OKLCH | oklch(54.6% 0.164 274.4) |
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 #5663CE | 5.15:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #5663CE | 4.07:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #5663CE text on white | 5.15:1 | AA | Lc 75.2 | Fine for body text |
| #5663CE text on black | 4.07:1 | AA large text | Lc -26.5 | 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
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F5
oklch(88.5% 0.041 273.3)
-
Step 300
300
#B2BEF1
oklch(81% 0.073 274.3)
-
Step 400
400
#8A9AEA
oklch(70.6% 0.119 274.4)
-
Step 500
500
#6F7FE3
oklch(63% 0.15 274.4)
-
Step 600
600 (this color)
#5663CE
oklch(54.6% 0.164 274.4)
-
Step 700
700
#4954B5
oklch(49% 0.152 274.5)
-
Step 800
800
#3C4593
oklch(42.6% 0.127 274.7)
-
Step 900
900
#333B75
oklch(37.7% 0.099 274.8)
-
Step 950
950
#1E2345
oklch(27.1% 0.063 275.1)
#5663CE 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) | #2673D2 | 0.054 |
| Deuteranopia (no green cones) | #0368CC | 0.060 |
| Tritanopia (no blue cones) | #007C8F | 0.145 |
| Achromatopsia (no color) | #6D6D6D | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5663CE
#5663CE
oklch(54.6% 0.164 274.4)
- #866E00
#866E00
oklch(54.5% 0.112 93.7)
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 #5663CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.024
- Iris #6258C4 ΔE 0.032
- Slate Blue #6A5ACD ΔE 0.033
- Royal Blue #4169E1 ΔE 0.037
- Light Indigo #6D5ACF ΔE 0.037
- Warm Blue #4B57DB ΔE 0.040
- Neon Blue #4361EE ΔE 0.054
- French Blue #436BAD ΔE 0.063
Use #5663CE 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.