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
• Edit and delete sent messages on the recipient’s end
• 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

Pretty cool application for encrypted messages, security is important to me but Threema is missing out on a huge opportunity to compartmentalize an SMS platform and offer the best of both worlds. I know the intention is to not cause confusion, but there are ways to mitigate that from a GUI perspective to differentiate the two services and it's disappointing to see such an expensive application that is missing out on that opportunity.

I was an early adopter of Threema, and have continued to use it over the years. It's a great app! A little more simplistic than something like Telegram, but far more secure...perfect for private messaging. I am liking the newer features, like the distribution list. Would love to see "channels", or at least an option to disable comments and/or hide members in group chats...for things like news feeds, diaries, , or album displays.

Considered this app to replace soon to be gone BBMe (which I used for about 15 years and loved). So far, I am not disappointed. However, few features could be a nice addition (and a 5 star rating) 1. Ability to edit the text message once it was sent and even if read by the recipient 2. Ability to retract the text even if already seen/ read by the recipient 3. Ability to export chats Thank you! Updated on 9/8/24 changing my rating from 4 to 5 stars -the ability to edit and delete texts is great!

What's new

- Improved support for large font sizes in polls
- Fixed a bug in relation to the chat order in the web client
- Various improvements and bug fixes