I just saw that BGG member Gavin McGruddy created an online platform on which you can play Calico solo. It's dead simple to use and the rules are easy to grasp, so if you're interested, I suggest you click the link below.
https://myautoma.github.io/games/calico/index.html
The game is a beat-your-own-score puzzle. Not my cup of tea, but I've seen that others enjoy the colourful patterns and, of course, the cats.
Î¥ou mean to be able to play online with others? I would say it's better to buy the actual game in that case. But maybe they'll make a full digital version eventually, who knows.