Somewhere above the Great Plains, a virtual woodpecker is en route to Alaska carrying a message to an anonymous pen pal, while a zebra finch named Tucker soars into Manhattan delivering a friend's shabby doodle of the Cool S. These messages take hours or even days to arrive, depending on the bird's flight distance, because that's the whole point of Roost, the viral "slow-cial" app that's making carrier pigeons cool again.

Roost arrives at a time when people supposedly crave the opportunity to slow down and disconnect from apps that constantly demand their attention, embracing technology that adds friction. "Everything on a phone is instantaneous these days," creator Logan Mendelsohn told TechCrunch. "[Roost] is kind of a break from the instant." When you sign up, you choose four birds for your rookery, each moving at its real-life speed - a falcon delivers faster than a hummingbird. If you really want to test your patience, you can send snails or turtles instead.

Mendelsohn, a senior product manager in trust and safety at Ticketmaster, built Roost as a side project for friends, who loved it so much they pushed him to publish it on the App Store. The app grew from 10,000 to 100,000 users within three days after a mother posted on Threads about her daughter communicating in Elizabethan English via bird-speed messages. Now, about five weeks later, Roost is nearing 300,000 users.

By default, only a user's city is shared; a "close friends" feature allows precise location sharing manually. The Pen Pals feature warns users not to share personal info and doesn't support photo sharing yet. Mendelsohn used Claude Code for development, but faced backlash for using AI-generated bird art. He's now running a contest for artists to contribute art, acknowledging, "As a solo founder, I don't think I could build and maintain something at this scale without AI-assisted development."