The best alternatives to Spiel are MasterClass, Brain Pump, and The Big Know. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Spiel?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Vodify is a Video-Based social network where anyone can ask and answer questions. Once you ask a question, a private video chat is immediately initiated with someone who can answer your question.