#665FD8
Closest named color: Dark Periwinkle (#665FD1). oklch(55.7% 0.18 281.4), rgb(102, 95, 216).
Aa
White text reads best on this color (5.00:1).
About this color
#665FD8 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.180 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.011 away. White text reads best on it, at 5.00:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #665FD8 |
| RGB | rgb(102, 95, 216) |
| HSL | hsl(243, 61%, 61%) |
| OKLCH | oklch(55.7% 0.18 281.4) |
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 #665FD8 | 5.00:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #665FD8 | 4.19:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #665FD8 text on white | 5.00:1 | AA | Lc 74.3 | Content text, not long reading |
| #665FD8 text on black | 4.19:1 | AA large text | Lc -27.4 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D3D6F7
oklch(88.4% 0.045 281.3)
-
Step 300
300
#B7BBF4
oklch(80.9% 0.08 281.3)
-
Step 400
400
#9396EF
oklch(70.7% 0.129 281.1)
-
Step 500
500
#7B79E9
oklch(63.1% 0.164 281.4)
-
Step 600
600 (this color)
#665FD8
oklch(55.7% 0.18 281.4)
-
Step 700
700
#554DBB
oklch(49.1% 0.167 281.6)
-
Step 800
800
#454097
oklch(42.6% 0.138 281.4)
-
Step 900
900
#3A3778
oklch(37.6% 0.108 282)
-
Step 950
950
#212147
oklch(27% 0.069 280.7)
#665FD8 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) | #0074DC | 0.085 |
| Deuteranopia (no green cones) | #006BD5 | 0.082 |
| Tritanopia (no blue cones) | #357B92 | 0.155 |
| Achromatopsia (no color) | #6F6F6F | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665FD8
#665FD8
oklch(55.7% 0.18 281.4)
- #827500
#827500
oklch(55.7% 0.116 101.7)
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 #665FD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.011
- Light Indigo #6D5ACF ΔE 0.019
- Slate Blue #6A5ACD ΔE 0.020
- Iris #6258C4 ΔE 0.035
- Warm Blue #4B57DB ΔE 0.045
- Royal Blue #4169E1 ΔE 0.049
- Medium Slate Blue #7B68EE ΔE 0.051
- Neon Blue #4361EE ΔE 0.055
Use #665FD8 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.