#663FC7
Closest named color: Bluey Purple (#6241C7). oklch(49.3% 0.199 290.3), rgb(102, 63, 199).
Aa
White text reads best on this color (6.77:1).
About this color
#663FC7 is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.199 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.008 away. White text reads best on it, at 6.77:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.199) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 3.10:1 |
| White text | 6.77:1 |
Values
| HEX | #663FC7 |
| RGB | rgb(102, 63, 199) |
| HSL | hsl(257, 55%, 51%) |
| OKLCH | oklch(49.3% 0.199 290.3) |
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 #663FC7 | 6.77:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #663FC7 | 3.10:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #663FC7 text on white | 6.77:1 | AA | Lc 82.7 | Fine for body text |
| #663FC7 text on black | 3.10:1 | AA large text | Lc -19.2 | 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 700.
-
Step 50
50
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FC
oklch(93.6% 0.028 290.2)
-
Step 200
200
#D8D4FB
oklch(88.5% 0.053 290)
-
Step 300
300
#C0B6FB
oklch(80.9% 0.097 290.7)
-
Step 400
400
#A18DF9
oklch(70.7% 0.155 290.4)
-
Step 500
500
#8C6CF5
oklch(63% 0.197 290.4)
-
Step 600
600
#784FE4
oklch(55.6% 0.214 290.4)
-
Step 700
700 (this color)
#663FC7
oklch(49.3% 0.199 290.3)
-
Step 800
800
#5235A0
oklch(42.7% 0.164 290.1)
-
Step 900
900
#44307F
oklch(37.8% 0.128 290.7)
-
Step 950
950
#271D4B
oklch(27% 0.082 289.8)
#663FC7 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) | #005ECB | 0.109 |
| Deuteranopia (no green cones) | #0058C4 | 0.106 |
| Tritanopia (no blue cones) | #46617E | 0.159 |
| Achromatopsia (no color) | #5B5B5B | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663FC7
#663FC7
oklch(49.3% 0.199 290.3)
- #656600
#656600
oklch(49.3% 0.108 110.4)
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 #663FC7, closest first.
No curated palette has a color within ΔE 0.04 of #663FC7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.008
- Blue With A Hint Of Purple #533CC6 ΔE 0.034
- Blurple #5539CC ΔE 0.034
- Burple #6832E3 ΔE 0.047
- Purple Blue #5D21D0 ΔE 0.051
- Iris #6258C4 ΔE 0.054
- Purpley Blue #5F34E7 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.060
Use #663FC7 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.