The best alternatives to followupthen are FollowUp, Stable Reminders, and Snooze. 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
Stable Reminders are email notifications sent directly to your inbox before important federal and state filings are due. These reminders are customized to your entity type and state(s) you've registered to do business in — and it’s all for free.
FlowUp is a New age Omnichannel Automated Lead Follow-up System powered by Voice and SMS that helps you upkeep your follow-ups and take your sales funnel to the next level. https://flowup.com/