The best alternatives to Fluency are Ummo, Speechyard, and Speechnotes. 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
speechx is a desktop app that analyses a user's voice, during online meetings or practice sessions, and provides AI-generated recommendations that improve critical speaking parameters like clarity, brevity, inclusivity and confidence.