Founded in 2016 by a trio of teenaged students in Germany, Tellonym says on the App Store that it has 13 million users worldwide; the app monitoring service SensorTower reports that the app had 600,000 downloads in January 2019. Tellonym CEO Maximillian Rellin says that 13 million is an "outdated" figure, but would only specify that it has more than 1 million daily users.
The idea is that users make a non-anonymous profile. Then, on that profile, users anonymously leave "tells," or messages intended to "tell me what you think of me." If the user chooses to answer an anonymous "tell," the conversation will appear on their profile.
"With growing rates of social anxiety, anonymity is a great option to talk to others, starting a conversation while slowly reducing concerns like fear of rejection to finally reveal oneself resulting in the creation of new friendships and sometimes also loves," Rellin said.