#6663D8
Closest named color: Dark Periwinkle (#665FD1). oklch(56.4% 0.174 280.4), rgb(102, 99, 216).
Aa
White text reads best on this color (4.83:1).
About this color
#6663D8 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.174 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.014 away. White text reads best on it, at 4.83:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #6663D8 |
| RGB | rgb(102, 99, 216) |
| HSL | hsl(242, 60%, 62%) |
| OKLCH | oklch(56.4% 0.174 280.4) |
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 #6663D8 | 4.83:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #6663D8 | 4.34:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #6663D8 text on white | 4.83:1 | AA | Lc 73.2 | Content text, not long reading |
| #6663D8 text on black | 4.34:1 | AA large text | Lc -28.4 | 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F6
oklch(88.6% 0.043 279.7)
-
Step 300
300
#B6BCF3
oklch(81% 0.078 279.7)
-
Step 400
400
#9297ED
oklch(70.7% 0.125 280.1)
-
Step 500
500
#797AE7
oklch(63% 0.161 280.4)
-
Step 600
600 (this color)
#6663D8
oklch(56.4% 0.174 280.4)
-
Step 700
700
#534FB9
oklch(49.1% 0.162 280.3)
-
Step 800
800
#444196
oklch(42.7% 0.135 280.6)
-
Step 900
900
#393877
oklch(37.7% 0.105 280.8)
-
Step 950
950
#212146
oklch(26.9% 0.067 280.9)
#6663D8 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) | #1B76DC | 0.076 |
| Deuteranopia (no green cones) | #006DD6 | 0.080 |
| Tritanopia (no blue cones) | #347E94 | 0.151 |
| Achromatopsia (no color) | #727272 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663D8
#6663D8
oklch(56.4% 0.174 280.4)
- #867600
#867600
oklch(56.3% 0.117 99.8)
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 #6663D8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.014
- Light Indigo #6D5ACF ΔE 0.025
- Slate Blue #6A5ACD ΔE 0.026
- Iris #6258C4 ΔE 0.040
- Royal Blue #4169E1 ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.048
- Warm Blue #4B57DB ΔE 0.050
- Neon Blue #4361EE ΔE 0.056
Use #6663D8 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.