The best alternatives to Twin Strangers are Doppies, CelebsLike.Me, and Doppel. If these 3 options don't work for you, we've listed a few more alternatives below.
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Doppel is a mobile app that uses deep learning (CNNs) to find your doppelgangers (look-alikes). Other features include a feed where you can look at other users' matches, face morphing, in-app chatting, groups, ...