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!

impossible to share pictures on Android due to not including the option to search by gallery and only by file. i would have NEVER purchased this if I've known. if you're looking to share pictures, please avoid. tried reaching out to support, too. they're super slow, will not read your request and then will reply with a canned message. after finally speaking with a human, they just thanked me for the suggestion. crazy how this feature was not included for android.

App regularly closes a chat by itself after i started typing, and you cant highlight more than one entry inside a chat (to delete only selected part). 90% of the time i cant call ppl, but they can call me without issues, and it happened on 3 different phones with different OS, so i know its not related to phone/signal strength, while other apps work fine at the same locations, while they are free. says a lot...

What’s new

- Fixed a bug in relation to access of stored files
- Message drafts are saved while typing
- Various improvements and bug fixes