Heartbeat Mailbox

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.