#665BD8
Closest named color: Dark Periwinkle (#665FD1). oklch(55% 0.185 282.4), rgb(102, 91, 216).
Aa
White text reads best on this color (5.18:1).
About this color
#665BD8 is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.185 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.015 away. White text reads best on it, at 5.18:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.05:1 |
| White text | 5.18:1 |
Values
| HEX | #665BD8 |
| RGB | rgb(102, 91, 216) |
| HSL | hsl(245, 62%, 60%) |
| OKLCH | oklch(55% 0.185 282.4) |
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 #665BD8 | 5.18:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #665BD8 | 4.05:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #665BD8 text on white | 5.18:1 | AA | Lc 75.3 | Fine for body text |
| #665BD8 text on black | 4.05:1 | AA large text | Lc -26.4 | 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
#D4D6F8
oklch(88.5% 0.047 282.7)
-
Step 300
300
#B8BAF6
oklch(80.8% 0.084 282.8)
-
Step 400
400
#9595F1
oklch(70.8% 0.133 282.5)
-
Step 500
500
#7D77EC
oklch(63.1% 0.171 282.6)
-
Step 600
600 (this color)
#665BD8
oklch(55% 0.185 282.4)
-
Step 700
700
#574CBD
oklch(49.2% 0.171 282.5)
-
Step 800
800
#473F99
oklch(42.8% 0.142 282.6)
-
Step 900
900
#3B367A
oklch(37.7% 0.112 282.9)
-
Step 950
950
#222047
oklch(26.9% 0.071 282.9)
#665BD8 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) | #0071DC | 0.088 |
| Deuteranopia (no green cones) | #0069D5 | 0.085 |
| Tritanopia (no blue cones) | #357891 | 0.157 |
| Achromatopsia (no color) | #6D6D6D | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BD8
#665BD8
oklch(55% 0.185 282.4)
- #7F7300
#7F7300
oklch(54.9% 0.115 102.2)
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 #665BD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.015
- Light Indigo #6D5ACF ΔE 0.017
- Slate Blue #6A5ACD ΔE 0.018
- Iris #6258C4 ΔE 0.032
- Warm Blue #4B57DB ΔE 0.041
- Royal Blue #4169E1 ΔE 0.053
- Neon Blue #4361EE ΔE 0.055
- Medium Slate Blue #7B68EE ΔE 0.056
Use #665BD8 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.