#5663CB
Closest named color: Dark Periwinkle (#665FD1). oklch(54.4% 0.16 274.4), rgb(86, 99, 203).
Aa
White text reads best on this color (5.19:1).
About this color
#5663CB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.160 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.025 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.04:1 |
| White text | 5.19:1 |
Values
| HEX | #5663CB |
| RGB | rgb(86, 99, 203) |
| HSL | hsl(233, 53%, 57%) |
| OKLCH | oklch(54.4% 0.16 274.4) |
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 #5663CB | 5.19:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #5663CB | 4.04:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #5663CB text on white | 5.19:1 | AA | Lc 75.5 | Fine for body text |
| #5663CB text on black | 4.04:1 | AA large text | Lc -26.3 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B2BEF0
oklch(81% 0.072 274.2)
-
Step 400
400
#8B9BE8
oklch(70.8% 0.114 274.2)
-
Step 500
500
#7080E1
oklch(63.2% 0.146 274.4)
-
Step 600
600 (this color)
#5663CB
oklch(54.4% 0.16 274.4)
-
Step 700
700
#4A55B3
oklch(49.2% 0.148 274.6)
-
Step 800
800
#3C4691
oklch(42.7% 0.123 274.3)
-
Step 900
900
#333B74
oklch(37.6% 0.097 274.7)
-
Step 950
950
#1E2344
oklch(27% 0.061 275)
#5663CB 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) | #2A72CF | 0.052 |
| Deuteranopia (no green cones) | #1168C9 | 0.057 |
| Tritanopia (no blue cones) | #027B8D | 0.143 |
| Achromatopsia (no color) | #6D6D6D | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5663CB
#5663CB
oklch(54.4% 0.16 274.4)
- #856E00
#856E00
oklch(54.4% 0.112 94.4)
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 #5663CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.025
- Iris #6258C4 ΔE 0.031
- Slate Blue #6A5ACD ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.038
- Royal Blue #4169E1 ΔE 0.041
- Warm Blue #4B57DB ΔE 0.043
- Neon Blue #4361EE ΔE 0.058
- French Blue #436BAD ΔE 0.059
Use #5663CB 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.