The best alternatives to Whispa are Struxe, MessageMe, and HashTagNotes. 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 offer all the documentation and productivity tools your organization needs wrapped around a private enterprise social network that dramatically boosts employee engagement.
Message yourself notes, links, files or TODOs but in a proper note-taking app! Better organize quick snippets of notes with tags to find relevant ones easily. Best of all, it works and syncs across all of your Apple devices!
Anonspace is a anonymous messaging application that offers advanced features ranging from messages encryption, sharing, group creation and a complete user panel.