The best alternatives to RunCat are Hugging Face, Touch Bar Nyancat, and Hatchi. If these 3 options don't work for you, we've listed a few more alternatives below.
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Mini Pets is a digital pet game where you raise a virtual pet by feeding it, playing with it, and cleaning it every 8 hours. A great, simple, hyper-casual and low maintenance game for all to play! Have fun unlocking the various pets available!