Slow-Messaging App Roost Hits 300,000 Users by Making Delivery Delays the Whole Point

A messaging app that intentionally takes hours or days to deliver a text has attracted nearly 300,000 users in about five weeks, turning what most developers treat as a bug into its core selling point.

Roost, built by Logan Mendelsohn, a senior product manager in trust and safety at Ticketmaster, routes every message through a virtual bird that flies a real route across a real map at that bird's actual flight speed. A falcon can get a note across town in a few hours. A hummingbird, turtle, or snail can stretch the same trip into days. Users pick four birds to keep in a personal collection called a "rookery," and each one has to physically arrive before it's free to carry another message.

There are no read receipts, no "online" indicators, and no push notifications pinging the moment a reply lands. A sender just gets a status update and has to wait.

The app grew slowly after Mendelsohn released it as a side project for friends, then jumped from 10,000 to 100,000 users within three days after a mother posted on Threads describing how her daughter and friends were writing to each other in Elizabethan English while waiting on their birds. Five weeks after launch, the user count was closing in on 300,000, according to Mendelsohn.

Mendelsohn has said the appeal is a deliberate break from apps that demand instant responses to every notification. Roost is free to download on the App Store and Google Play, with no subscription; the app instead sells in-app extras such as additional birds and decorative items.

Privacy was built in early. By default, other users can only see which city a person is in, not their exact location; a separate "close friends" setting lets someone share precise coordinates with specific people. The app also includes an anonymous "Pen Pals" feature that pairs users within the same age group, and it explicitly warns people during onboarding not to share real contact information or identifying details through it. Photo sharing is not available yet — Mendelsohn has said he wants stronger content-moderation tools in place before adding it.

The app has drawn some criticism over its use of AI-generated artwork for the birds themselves. After user pushback, Mendelsohn ran a contest inviting artists to submit original designs and said the AI-generated images will be phased out over time.

Roost isn't the only app betting on friction as a feature. Slowly, an existing pen-pal app, simulates postal delivery times between users in different countries. But Roost's real-time bird tracking and gamified "rookery" system have made it the more visible entrant in what some commentators have started calling the "slow-cial" category — social apps built around deliberately removing speed rather than adding it.