#5F66D2
Closest named color: Dark Periwinkle (#665FD1). oklch(56% 0.164 276.9), rgb(95, 102, 210).
Aa
White text reads best on this color (4.86:1).
About this color
#5F66D2 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.164 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.018 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #5F66D2 |
| RGB | rgb(95, 102, 210) |
| HSL | hsl(236, 56%, 60%) |
| OKLCH | oklch(56% 0.164 276.9) |
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 #5F66D2 | 4.86:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #5F66D2 | 4.31:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #5F66D2 text on white | 4.86:1 | AA | Lc 73.5 | Content text, not long reading |
| #5F66D2 text on black | 4.31:1 | AA large text | Lc -28.2 | 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
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B4BDF1
oklch(80.9% 0.074 277)
-
Step 400
400
#8E99E9
oklch(70.7% 0.117 277)
-
Step 500
500
#747EE3
oklch(63.2% 0.151 276.9)
-
Step 600
600 (this color)
#5F66D2
oklch(56% 0.164 276.9)
-
Step 700
700
#4E53B5
oklch(49.2% 0.152 277)
-
Step 800
800
#3F4492
oklch(42.6% 0.126 276.8)
-
Step 900
900
#353A75
oklch(37.6% 0.1 276.8)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#5F66D2 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) | #2C76D6 | 0.059 |
| Deuteranopia (no green cones) | #196DD0 | 0.063 |
| Tritanopia (no blue cones) | #257E92 | 0.143 |
| Achromatopsia (no color) | #717171 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F66D2
#5F66D2
oklch(56% 0.164 276.9)
- #887400
#887400
oklch(56.1% 0.116 97.1)
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 #5F66D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.031
- Light Indigo #6D5ACF ΔE 0.033
- Iris #6258C4 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.041
- Warm Blue #4B57DB ΔE 0.050
- Neon Blue #4361EE ΔE 0.057
- Medium Slate Blue #7B68EE ΔE 0.060
Use #5F66D2 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.