#5C66CD
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.157 275.8), rgb(92, 102, 205).
Aa
White text reads best on this color (4.95:1).
About this color
#5C66CD is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.157 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.022 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #5C66CD |
| RGB | rgb(92, 102, 205) |
| HSL | hsl(235, 53%, 58%) |
| OKLCH | oklch(55.5% 0.157 275.8) |
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 #5C66CD | 4.95:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #5C66CD | 4.23:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #5C66CD text on white | 4.95:1 | AA | Lc 74.1 | Content text, not long reading |
| #5C66CD text on black | 4.23:1 | AA large text | Lc -27.6 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B3BDEF
oklch(80.8% 0.072 275.9)
-
Step 400
400
#8D9AE7
oklch(70.7% 0.114 275.8)
-
Step 500
500
#737FE0
oklch(63.1% 0.145 276.1)
-
Step 600
600 (this color)
#5C66CD
oklch(55.5% 0.157 275.8)
-
Step 700
700
#4C54B2
oklch(49% 0.147 275.9)
-
Step 800
800
#3E4690
oklch(42.8% 0.121 275.4)
-
Step 900
900
#353B73
oklch(37.7% 0.095 276.2)
-
Step 950
950
#1F2343
oklch(27% 0.059 276.3)
#5C66CD 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) | #3175D1 | 0.053 |
| Deuteranopia (no green cones) | #206BCB | 0.057 |
| Tritanopia (no blue cones) | #217D90 | 0.138 |
| Achromatopsia (no color) | #707070 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5C66CD
#5C66CD
oklch(55.5% 0.157 275.8)
- #877200
#877200
oklch(55.5% 0.114 96.2)
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 #5C66CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.022
- Slate Blue #6A5ACD ΔE 0.033
- Iris #6258C4 ΔE 0.035
- Light Indigo #6D5ACF ΔE 0.036
- Royal Blue #4169E1 ΔE 0.042
- Warm Blue #4B57DB ΔE 0.051
- Neon Blue #4361EE ΔE 0.061
- French Blue #436BAD ΔE 0.062
Use #5C66CD 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.