Instant Messaging

Real-time Text Transmission via Internet


Session is a new kind of private messenger built on a unique network of user-operated servers around the world. Because there are no central servers, Session can't share or sell your data. And with Session's private routing protocols, your messages are completely anonymous. No one finds out who you're talking to, what you're saying, or even your IP address.


  • No registration with name, address or telephone number
  • No SIM card required (works without mobile radio module)
  • Session meets the requirements of the EU GDPR

With Session you can make end-to-end encrypted chats and phone calls (optionally also with video, i.e. videophone).

Simple User Interface

The ease of use also speaks for Session: chatting works just like with other providers. The app is not overloaded with functions and only has what you really need.

Privacy by Default

The developers' restriction to the absolute essentials not only ensures easy usability for the user through tidy design. It also keeps the programme code lean and clear. Motto: “Privacy by Design”.

It is true that you cannot show your friends any status (state of mind, greeting, statement) and the recipient circle is also not told what music you are currently listening to. But the sending status of the messages (delivered/read) is reliably displayed (can be switched off if desired). For most of us, this is much more important than knowing what music, audio books or videos are currently playing on our friend's phone or what he/she is currently thinking.
If you want to know the latter, it's a nice reason to start a conversation via chat or classic telephony. Augenzwinkern
And if you want to send pictures to each other, you can do so very conveniently with any smartphone using the “Share” function.

Messengers are criticised when they cannot handle large videos.
Videos can be wonderful Trojan slingshots!
This makes the use of a secure messenger absurd!

Session is Open Source

This enables interested experts to carry out independent safety checks at any time. In addition, Session has already undergone a comprehensive audit.


Lightpaper explains how it works on 4 pages

Finding and Exploiting Vulnerabilities in H.264 Decoders

back | Signal | Threema | App review: Session | Text auf Deutsch

Keyword list: Books, Chat, H.264, IP, IT, Instant Messaging, Internet, Network, Open Source, Privacy, Providers, SIM, Service, Session, Smartphone, Telephony, Threema, User, Who, how, review

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