The best alternatives to Zipwhip are Triby, Textline, and telephonaki. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Textline’s software empowers companies of all sizes to use texting to build more intimate relationships, with customers, sales prospects and employees. Our messaging platform allows companies to directly connect with people, build trust and form relationships that become part of the most innovative customer experiences available today.