The best alternatives to Penzils are Snaptutor, Studious, and Studyhub. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
We are a tutoring platform that takes no fees from individual tutors. All of the tutors on the platform are required to be PhD holders or candidates. Meet with our tutors weekly to turn a class, MOOC, or self study into a personalized tutorial.