The best alternatives to CastUpon are Marketing Over Coffee, Otto Radio, and Repod. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— The most accurate API for conversational speech-to-text
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PodHound is an AI-powered recommendation engine for podcasts. The AI is learning all the time about what you like and will recommend podcasts based on content, not just popularity. Discover podcasts from around the world or around the corner.