Threema. The Secure Messenger

4.5
72.4K reviews
5M+
Downloads
Content rating
Parental guidance
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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
Updated on
Mar 21, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.5
69.7K reviews
meilla104
February 26, 2024
One star is already to much. This app is horrible and totally useless. Sometimes messages need hours to be delivered and calls are a nightmare. Calling to another Threema almost never works. When the connection is established, it always cut. Often, the app must be open to load new messages because Threema doesn't load them. Threema web is totally useless as it works even less than the app. And then, the best, the support is arrogant and never admit that Threema can face issues.
81 people found this review helpful
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Threema GmbH
February 27, 2024
Problems in relation to push notifications are typically caused by restrictions on certain device types. Please follow these instructions: https://threema.ch/faq/nopush. Problems related to Threema calls are often caused by the network configuration. If the problem persists, please get in touch with our support team: help@threema.ch
Stefan Kirsch
March 17, 2024
Unfortunately, the backups for Threema are unreliable. First of all, there seems to be no automated way to do chat backups. Second, if you loose your threema ID you're out of luck entirely and can't even recover chats that you did backups of. I had set up the threema safe, but it didn't end up working for whatever reason. So if you want to be sure that your chats can always be recovered, I would advise you to use a different app.
8 people found this review helpful
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Threema GmbH
March 18, 2024
Threema Safe is an automated backup of your most important data. If the restore does not work most of the time the provided Threema ID or password are not correct. Should you encounter any issues, do not hesitate to contact our support team: help@threema.ch. We are always happy to help!
MT MT (MT_MT)
February 21, 2024
The app doesn't post a notification during call to control it like speaker or hang up the call. if u leave, u have to go back to the app and open the active call, then hang up or even turn the speaker on or off. If I'm calling someone on speaker, then I want suddenly to turn off the speaker, I can't do it in time. That needs to be fixed soon. Android 14 Samsung S23 ultra
12 people found this review helpful
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Threema GmbH
February 22, 2024
Thank you for your review! We will be happy to forward your feedback. Inputs and suggestions are always welcome!

What's new

- Added a highlighter pen function to image editor
- Support for animated WebP images
- Numerous optimizations and bug fixes