Threema. The Secure Messenger

Threema is a messaging application that prioritizes privacy and anonymity for its users. This is achieved through various features and practices that limit the collection and misuse of personal information. The app is fully compliant with European privacy legislation and is designed to generate as little data on servers as possible. This means that group memberships, contact lists, and messages are all managed and stored on the user's device, and are immediately deleted after being delivered. Additionally, all local files are encrypted on the user's mobile phone or tablet.

The app also boasts rock-solid encryption for all forms of communication, including messages, voice and video calls, group chats, and even status messages. This is achieved through the use of the trusted open source NaCl cryptography library, and the encryption keys are generated and stored on the user's device to prevent backdoor access or copies.

Threema offers a comprehensive set of features, including the ability to write text and send voice messages, make voice, video, and group calls, share videos, pictures, and locations, and send any type of file. Users can also use the desktop app or web client to chat from their computer, create groups, conduct polls, and choose between a dark and light theme. The app also has a unique agree/disagree feature for quick and silent replies, and users can verify the identity of a contact by scanning their personal QR code.

All of Threema's servers are located in Switzerland, and the app is developed in-house. This ensures full anonymity for users, as each user receives a random Threema ID for identification. No phone number or email address is required to use the app, allowing for complete anonymity without the need to give up private information or open an account.

The source code of the Threema app is open for everyone to review, and the app undergoes regular security audits by renowned experts. Threema is also not financed by advertising and does not collect user data, ensuring a completely ad-free and private experience for users. In case of any questions or problems, users can consult the app's FAQs for support.