The best alternatives to The Slack Post are Hamster Pad, Lurchr, and Paperbot (Reloaded). 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
unvisited.io lets you create a custom news feed with content from your favourite sites, podcasts and YouTube channels. Organize feeds with tags, Enjoy multiple layout views, Sync feeds automatically or manually, Add articles to a Read later list.