#5A66DE
Closest named color: Dark Periwinkle (#665FD1). oklch(56.6% 0.181 274.7), rgb(90, 102, 222).
Aa
White text reads best on this color (4.78:1).
About this color
#5A66DE is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.181 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.028 away. White text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.39:1 |
| White text | 4.78:1 |
Values
| HEX | #5A66DE |
| RGB | rgb(90, 102, 222) |
| HSL | hsl(235, 67%, 61%) |
| OKLCH | oklch(56.6% 0.181 274.7) |
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 #5A66DE | 4.78:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #5A66DE | 4.39:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #5A66DE text on white | 4.78:1 | AA | Lc 72.9 | Content text, not long reading |
| #5A66DE text on black | 4.39:1 | AA large text | Lc -28.8 | 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
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F8
oklch(88.6% 0.045 274.4)
-
Step 300
300
#B1BDF6
oklch(80.9% 0.082 275.2)
-
Step 400
400
#8999F1
oklch(70.7% 0.13 274.8)
-
Step 500
500
#6E7DEC
oklch(63.1% 0.166 274.8)
-
Step 600
600 (this color)
#5A66DE
oklch(56.6% 0.181 274.7)
-
Step 700
700
#4851BE
oklch(49.1% 0.169 274.7)
-
Step 800
800
#3B439A
oklch(42.7% 0.14 274.8)
-
Step 900
900
#323A7A
oklch(37.8% 0.108 274.7)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#5A66DE 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) | #1178E2 | 0.064 |
| Deuteranopia (no green cones) | #006DDC | 0.062 |
| Tritanopia (no blue cones) | #008298 | 0.157 |
| Achromatopsia (no color) | #727272 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5A66DE
#5A66DE
oklch(56.6% 0.181 274.7)
- #8C7400
#8C7400
oklch(56.5% 0.116 94.5)
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 #5A66DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.028
- Royal Blue #4169E1 ΔE 0.028
- Neon Blue #4361EE ΔE 0.040
- Slate Blue #6A5ACD ΔE 0.041
- Light Indigo #6D5ACF ΔE 0.042
- Warm Blue #4B57DB ΔE 0.043
- Iris #6258C4 ΔE 0.050
- Medium Slate Blue #7B68EE ΔE 0.054
Use #5A66DE 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.