The best alternatives to Botletter are ManyChat, Revoice, and MindIQ. If these 3 options don't work for you, we've listed a few more alternatives below.
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Revoice gives you a landing page and a widget for your website where anyone can subscribe to you on messaging apps. If you have a Newsletter, Blog or Youtube channel we will use that, make it look good on Messenger and deliver all new content to your subscribers. You can then save your subscribers on any CRM or export as a CSV file.