Threema. The Secure Messenger

Threema GmbH

About this app

Threema is the world’s best-selling secure messenger, used by more than 12 million people in over 175 countries, developed in Switzerland, and designed with privacy and data protection in mind. Whether chats, calls, or files, everything is end-to-end encrypted, and no data trail is left behind. Instead of a phone number or email address, a randomly generated Threema ID serves as a unique identifier – anonymous and secure. Threema protects what really matters: your privacy.

Advantages of Threema:
· Text and voice messages, including emoji reactions
· End-to-end encrypted voice, video, and group calls
· Location sharing
· Sending files in all formats (PDF, GIF, MP3, ZIP, and more)
· Ability to edit sent messages and delete them for chat partners
· Desktop app and web client for convenient chatting on your PC
· Group creation and polls
· Light or dark mode
· No ads, no trackers, no data collection
· Identity verification of contacts by scanning their QR code

Reliable security:
· Open source and regular audits
· Servers in Switzerland
· Anonymous use possible: no phone number or email address required
· Messages are deleted from the server immediately after delivery

Do you have any questions or problems? Our FAQ can help: https://threema.com/support

Enjoy using Threema!
Threema is the world’s best-selling secure messenger, used by more than 12 million people in over 175 countries, developed in Switzerland, and designed with privacy and data protection in mind. Whether chats, calls, or files, everything is end-to-end encrypted, and no data trail is left behind. Instead of a phone number or email address, a randomly generated Threema ID serves as a unique identifier – anonymous and secure. Threema protects what really matters: your privacy.

Advantages of Threema:
· Text and voice messages, including emoji reactions
· End-to-end encrypted voice, video, and group calls
· Location sharing
· Sending files in all formats (PDF, GIF, MP3, ZIP, and more)
· Ability to edit sent messages and delete them for chat partners
· Desktop app and web client for convenient chatting on your PC
· Group creation and polls
· Light or dark mode
· No ads, no trackers, no data collection
· Identity verification of contacts by scanning their QR code

Reliable security:
· Open source and regular audits
· Servers in Switzerland
· Anonymous use possible: no phone number or email address required
· Messages are deleted from the server immediately after delivery

Do you have any questions or problems? Our FAQ can help: https://threema.com/support

Enjoy using Threema!

Ratings and reviews

Consistently exceeds expectations! I have used Threema for years and, if they had stayed with the earliest versions of the app, I'd still purchase it! In addition to the encryption and security, they have continually added features that aren't seen elsewhere with the encryption and security Threema provides. If someone with whom I regularly communicate does not already have it, I purchase it for them. For everything Threema provides, especially at the price, it's ludicrous to not have it!

generally good, but videos constantly get stuck when sending. Tap to resend. which I did and it still doesn't send. this is despite being under the maximum file size and having a good stable WiFi connection. very frustrating.

For the last couple of days, I've been having huge issues with voice messages. After recording voice messages, the app doesn't let me send them. It keeps saying "empty recording or unable to determine length" and my whole recording is gone. I restarted my phone, uninstalled and re-installed the app and I am still getting this error with every voice message I'm trying to send. I now have to use my other messaging app again which I wanted to avoid but switching to Threema 😕

What’s new

- Various under-the-hood improvements and bug fixes