Threema. The Secure Messenger

Threema GmbH

About this app

Threema is the world’s best-selling secure messenger and keeps your data out of the hands of hackers, corporations, and governments. The service can be used completely anonymously. Threema is open source and offers every feature one would expect from a state-of-the-art instant messenger. The app also allows you to make end-to-end encrypted voice, video, and group calls. Using the desktop app and the web client, you can also use Threema from your desktop.

PRIVACY AND ANONYMITY
Threema is designed from the ground up to generate as little data on servers as possible. Group memberships and contact lists are managed on your device only and never stored on our servers. Messages are immediately deleted after they have been delivered. Local files are stored encrypted on your mobile phone or tablet. All this effectively prevents the collection and misuse of your personal information, including metadata. Threema is fully compliant with the European privacy legislation (GDPR).

ROCK-SOLID ENCRYPTION
Threema end-to-end encrypts all your communication, including messages, voice and video calls, group chats, files, and even status messages. Only the intended recipient, and nobody else, can read your messages. Threema uses the trusted open source NaCl cryptography library for encryption. The encryption keys are generated and safely stored on the users’ devices to prevent backdoor access or copies.

COMPREHENSIVE FEATURES
Threema is not only an encrypted and private messenger but also versatile and feature-rich.

• Write text and send voice messages
• Make voice, video and group calls
• Share videos pictures and locations
• Send any type of file (pdf animated gif, mp3, doc, zip, etc.)
• Use the desktop app or the web client to chat from your computer
• Create groups
• Conduct polls with the poll feature
• Choose between a dark and a light theme
• Quickly and silently reply with the unique agree/disagree feature
• Verify the identity of a contact by scanning their personal QR code
• Use Threema as anonymous instant messaging tool
• Synchronize your contacts (optional)

SERVERS IN SWITZERLAND
All our servers are located in Switzerland, and we develop our software in-house.

FULL ANONYMITY
Each Threema user receives a random Threema ID for identification. A phone number or email address is not required to use Threema. This unique feature allows you to use Threema completely anonymously – no need to give up private information or to open an account.

OPEN SOURCE AND AUDITS
The source code of the Threema app is open for everyone to review. On top of that, renowned experts are regularly commissioned to conduct systematic security audits of Threema’s code.

NO ADS, NO TRACKERS
Threema is not financed by advertising and does not collect user data.

SUPPORT / CONTACT
For questions or problems please consult our FAQs: https://threema.ch/en/faq

Ratings and reviews

Looking to replace gboard because of the horrible voice memo slide to cancel, thought this would be a good replacement but I just didn't realize you literally can only use this app with other people that have the app. Unfortunately most people I know would not pay $7 for messaging app when there's so many free ones so I was annoyed, sent them an email but then realized that I could immediately get a refund through the Play store. Thanks for making it easy!!

It's almost perfect. I just wish it wouldn't compress my photos and videos. I've selected to send them at original / full quality but there's always some level of compression. The encoding / compression destroys the HDR and the result looks really bad. Telegram doesn't have this problem so I generally still use Telegrams. I hope Threema fixes this someday.

Use to work. After updated to new version 6/5/2024, sometimes I cannot send and receive my messages. I need to restart my phone and it will send and receive again. I'm running android 14. My phone is pixel 6a. Thanks.

What's new

Restored connection fallback functionality in case of blocked ports or IPv6 issues