Boomerang adds time management to Gmail and Outlook. You can write an email and schedule it to send later, set a message to return to your inbox if nobody replies by a certain date, or hide an email until the moment you want to deal with it. Recurring messages, read receipts, and a pause feature that holds incoming mail until you choose to see it help people manage busy inboxes.
The Respondable feature analyzes a draft as you write it and estimates how likely it is to get a reply, taking into account subject length, word count, question count, reading level, and tone. It suggests changes, such as shorter sentences or fewer questions. Newer AI features help draft messages and respond more quickly, and a meeting scheduler lets recipients pick times.
Boomerang has a free plan with a monthly limit on message credits and paid plans that remove the limits and add features such as read receipts and recurring messages. The extension reads your mail to provide these features, so understand its privacy terms before installing. Gmail now has native scheduled send and snooze, which covers some of its original value. Superhuman, Spark, and Mailbutler are alternatives that offer more advanced email workflows.