The best alternatives to Square Off are Perfect Circle, Chesscademy, and Chesster. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Play now free: https://click-storm.com/matchmaking/chess/. Try matchmacking and tournaments and have fun! FIDE masters already playing this have and found out it's super fun.