Based on our record, LetterMeLater.com seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If all you want is to send out appointment reminders, then you could use an email scheduler like LetterMeLater. Here's a link to the site https://lettermelater.com/. Source: 12 months ago
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SendLater - Email scheduler for Mac Mail.
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RGB Technologies - Email Scheduler - Email Scheduler provides an intuitive email scheduling solution, integrated within the existing Salesforce account.
Letter to my future self - Letter to my future self is a prominent email scheduling service that gives you the opportunity to create a letter with goals and thoughts for your future self and schedule a date for sending it.