Based on our record, Followup.cc 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.
I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 2 years ago
ArticleBunny - Get fast, professional articles at an affordable price
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Cold Email Hacks - Proven cold email templates and tactics for B2B startups
FollowUpThen - The simplest way to schedule an email reminder
Tech Doc Assistant - Google Docs add-on for recommendations on technical writing.
Onesheet CRM - The Simple CRM for Google Sheets