Review date: 09/08/2021

This Swiss-made, privacy-focused text and video call app is open-sourced, based on privacy by design principles and saw it’s downloads take off earlier in 2021 when WhatsApp announced controversial change to their privacy policies. Threema touts it’s $2.99 app as a service that can be used completely anonymously (which, yay!, but we always caution about things being completely anonymous, it’s really hard to make anything completely anonymous). Threema is one of the best privacy-focused messaging apps we have seen, with its end-to-end encryption, no phone number required to sign up, and its commitment to not collect user data. Yay for privacy-focused apps!

What could happen if something goes wrong

You love to see a privacy focused app like Threema where the answer to the question, “What could happen if something goes wrong?” is truly, “Likely, not much.” End-to-end encryption. Check. No need to sign up with anything that could be linked to you like a phone number or email address. Check. Does not collect user data. Does not target ads in any way. Check and check! What little data does pass through the Swiss-based servers is deleted very quickly. Check. No known security breaches. Check! Threema really does check all the privacy-focused boxes. They even opened up the source code for their artificial intelligence features like face detection. We absolutely love to see transparency when it comes to the use of AI! Good work Threema! We’d say Threema is well worth the $2.99 price (however, this shows once again that good privacy is rarely ever free).


Can it snoop on me?


Device: N/A

App: Yes


Device: N/A

App: Yes

Tracks Location

Device: N/A

App: No

What is required to sign up?

Threema sets up an 8-digit Threema ID for all users

What data does it collect?

How does it use this data?

According to Threema, the data is processed exclusively by Threema on its own server infrastructure in Switzerland and is not passed on to third parties.

What is the company’s known track record for protecting users’ data?


No known history of data breaches or leaks.

Can this product be used offline?

Not applicable

User friendly privacy information?


A good example of a short and concise privacy policy, accompanied by detailed transparent papers on everything from encryption to FAQ addressing numerous possible concerns.

Links to privacy information


Does this product meet our Minimum Security Standards?




Full end to end encryption of chats & calls, by default.

Strong password


Threema allows various security passwords, namely PIN codes to log in, passphrases and lock codes to protect chats.

Security updates


Automatic updates from the respective app store or with a built-in updater.

Manages vulnerabilities


Dedicated contacts for security issues are provided. On top of that, external security experts are commissioned to conduct security audits on a regular basis.

Privacy policy


Artificial Intelligence

Does the product use AI?


Does the AI use your personal data to make decisions about you?


Does the company allow users to see how the AI works?


Some features such as face detection for photos are AI-based. Threema uses this AI facial recognition to find faces in images to blur them out for privacy. Good work Threema! And their AI code is open source. Anyone who is interested can look at the code.