Tellonym logo

Tellonym is a free, ad-supported, cross-platform messaging app to have questions answered. Tellonym is an easy way to get feedback and supports the anonymity of the person giving the feedback as well as the possibility to give unsolicited feedback.

The app is developed by Callosum Software. The company's headquarters are in Berlin, Germany.

Quick Facts


  • Ranked #6,132th worldwide
  • Active users 40 M
  • Type Anonymous Networks
  • Launched date Apr 2016
  • Employees 12
  • Headquarters Berlin, Germany
  • Parent company Callosum Software


Maximilian Rellin Germany
Max Fehmerling
Birger Naß
Johannes Sorg


  • Brand value In 2020 N/A
  • Revenue in 2020 $325.4 B
  • Net loss In 2020 N/A

Current Controversies

There is growing worry among parents, digital watchdog organizations, and schools about an app called Tellonym. The app lets users ask and answer questions about each other anonymously — a concept that the app creators hope will encourage open and honest conversation, but experts say is enabling cyberbullying and cruelty.

The possibility to formulate tells anonymously makes it easier for users to insult or harass others, which can lead to cyber-bullying. Since 70 percent of Tellonym users are adolescent girls, they are particularly likely to be unsettled by anonymous insults. In many cases, "drastic insults or even incitements to suicide" can be observed on Tellonym. Digital mechanisms for the prevention of suicide or running amok have not yet been integrated (as of December 2019).

Original Idea

original ideaoriginal idea

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 Tellonym CEO Maximillian Rellin says that 13 million is an "outdated" figure, but would only specify that it has more than 1 million daily users.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.

Brief History

Apr The app was founded.
May 700,000 users registered.
Jun 2M users.
Jan 600,000 downloads.
Jun Google App Store indicates more than 10M registrations.

Network Features

Main Features

Anonymous Q&A application, completely honest content.

Create personal profiles, participate in Q&A with the community.

Receive hundreds of honest anonymous messages.

Follow your friends and join the conversation.

User Profiles

User profilesScreenshot: rachel kraus/mashable. (via tellonym on the app store)

The messages on Tellonym are called Tells. A user's profile consists of a username and optionally a short description and an emoji, which are obtained during events or can be purchased.

The profile is used to collect feedback, about oneself, about work, about any questions.

Tellonym can thus be used as a kind of survey tool In addition to friends, complete strangers can access the personal profile via a public link and leave comments there. This makes it easier to leave hurtful or annoying comments.

In order to rate other users, it is not necessary to have your own profile, where you would have to provide your name or e-mail address. The provider reserves the right to keep the messages and IP addresses of the end devices for a possibly necessary transmission to criminal authorities.

The app allows you to set up a user-based word filter with a maximum of ten words, which prevents "tells" containing the listed words from reaching the user. This word filter is ineffective in practice, as it can be circumvented by exchanging single letters. A timer function can be used to schedule the time of sending the message.

Control Features

There are several controls features available in Tellonym, some of the built-in, some of them must be set up. The following are controls you can apply, (we recommend doing a setup together with your teen):

Language Filters
Custom Word Filter
Set a Safety Code
Extensive Blocking Mechanism
Only Receive Tells from Registered Users
Report Messages
Deleting the Account

Tips For Staying Safe

Talk to your child about what they’re sharing

Help your child think about what they share online and who sees it. Compare it to what they would be happy to share offline. Remind them that they shouldn’t share private things, such as:

Personal information, like names, emails, phone numbers, location, and school names.

Other people’s personal information.

Links to join private group chats.

Photos of themselves.

Photos of their body, such as sexual photos or videos.

Have regular conversations

Talking to your child about what is going on online and offline and risks will help them gain an understanding and develop their digital resilience. Our advice and tips can help you start these conversations.

Check their privacy settings on your child’s Tellonym account.


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