#6663DA
Closest named color: Dark Periwinkle (#665FD1). oklch(56.5% 0.177 280.2), rgb(102, 99, 218).
Aa
White text reads best on this color (4.81:1).
About this color
#6663DA is a medium-dark, vivid purple. In OKLCH its lightness is 57%, its chroma 0.177 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.016 away. White text reads best on it, at 4.81:1.
| Hue family | Purples |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #6663DA |
| RGB | rgb(102, 99, 218) |
| HSL | hsl(242, 62%, 62%) |
| OKLCH | oklch(56.5% 0.177 280.2) |
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 #6663DA | 4.81:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #6663DA | 4.36:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #6663DA text on white | 4.81:1 | AA | Lc 73.1 | Content text, not long reading |
| #6663DA text on black | 4.36:1 | AA large text | Lc -28.6 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D3D7F7
oklch(88.6% 0.044 279.8)
-
Step 300
300
#B6BBF4
oklch(80.8% 0.081 280.5)
-
Step 400
400
#9297EE
oklch(70.8% 0.126 280.1)
-
Step 500
500
#797AE9
oklch(63.1% 0.163 280.3)
-
Step 600
600 (this color)
#6663DA
oklch(56.5% 0.177 280.2)
-
Step 700
700
#534FBA
oklch(49.2% 0.164 280.2)
-
Step 800
800
#444197
oklch(42.8% 0.137 280.5)
-
Step 900
900
#383878
oklch(37.7% 0.106 280)
-
Step 950
950
#212146
oklch(26.9% 0.067 280.9)
#6663DA 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) | #1677DE | 0.078 |
| Deuteranopia (no green cones) | #006DD7 | 0.080 |
| Tritanopia (no blue cones) | #327E95 | 0.152 |
| Achromatopsia (no color) | #727272 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663DA
#6663DA
oklch(56.5% 0.177 280.2)
- #867700
#867700
oklch(56.6% 0.118 100.5)
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 #6663DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.016
- Light Indigo #6D5ACF ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.028
- Iris #6258C4 ΔE 0.042
- Royal Blue #4169E1 ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.046
- Warm Blue #4B57DB ΔE 0.050
- Neon Blue #4361EE ΔE 0.054
Use #6663DA 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.