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• Letters now need at least 10 characters so your words reach people better. The writing screen lets you know if it's too short
Anonymous letters arrive at random. Reply within 24 hours or they vanish.
Heartbeat Mailbox is an anonymous letter app where letters from strangers arrive at random. 💌 Your mailbox bounces when a letter arrives Open the envelope and read a stranger's day. You never know who sent it. ⏳ Reply within 24 hours, or it disappears If a letter touches your heart, send a reply. It goes straight back to the writer. ✏️ Send your own letter Pick a cute letter paper and send a warm note to someone out there. We'll let you know when someone replies. 🌙 Take a break anytime Pause receiving letters for today, 3 days, 7 days, or until you turn it back on. 🎟️ Stamps One letter needs one stamp. Free stamps refill every day, and you can get more by watching an ad or buying a stamp pack. Subscribe to Premium for unlimited stamps. 🔐 A safe mailbox • Insults, sexual content, phone numbers, links and messenger IDs can't be sent • Report and block upsetting letters instantly — our team reviews reports within 24 hours • No sign-up needed. Log in with Apple or Google if you want to keep your letters Available in 17 languages. You exchange letters with people who speak your language.