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, allows to make end-to-end encrypted voice and video calls, and offers every feature one would expect from a state-of-the-art instant messenger. With Threema Web, you can also use Threema from your Desktop.

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).

Threema encrypts ALL your communications END-TO-END including messages, voice and video calls, group chats, media files and even status messages. You can rest assured that only the intended recipient can read your chats, and nobody else – not even us. Threema uses the trusted open source NaCl cryptography library for encryption. The encryption keys are generated and safely stored on users’ devices to prevent backdoor access or copies.

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

• Write text and send voice messages
• Make voice and video calls (requires iPhone 5s / iOS 10 or above)
• Share videos, pictures and locations
• Send any type of file (pdf, animated gif, mp3, doc, zip, etc.)
• Use Threema Web to chat from your Desktop
• 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)

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

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.

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.

Threema is not financed by advertising and does not collect user data.

For questions or problems please consult our FAQs:

What’s New

Version 4.6.15

• Fixed a bug concerning Asian language keyboards
• Extended log to include files if requested by user
• Other improvements and miscellaneous minor bug fixes

Ratings and Reviews

4.3 out of 5
29 Ratings

29 Ratings

Mistah Nicks ,

Ask yourself if you need this

This app is absolute class when it comes to privacy. You are unlikely to find any of your friends in here unless you give them a big lecture on privacy. Therefore this is clearly not a Whatsapp alternative. Also if you have bulk media files to share, this is trash and you should look elsewhere. I will give them thumbs up just because of what they have done or what their goal is.

murarisumit ,

Unreliable with messages delivery

Trying to use it with my family, but message delivery is very unreliable. Videos are just not delivered, have to try atleast trice. Message aren’t delivered to them instantly, sometimes after hours later. Tried echo testing and reaching their support, nothing works App core concept are really strong, love the implementation but message delivery probably infrastructure is very unreliable, hope it improves soon

Rest of features like delete on both side and other don’t bother me as their explanation do make sense, they don’t want to give false sense of security, love them those aspects. I can trust on it, as they have implemented features which are full proof, but main part of message delivery that is very shaky

Developer Response ,

Provided that a stable Internet connection is established, messages are typically delivered within a few seconds if the background permissions on the recipient’s phone are configured correctly.

We are happy to help if you need assistance in configuring the settings correctly:

Vishwa_S ,

I have no friends 😭

I installed Threema because of privacy concerns with another popular messaging app. However, now none of my contacts seem to use Threema. I’ve tried to spread the word but garnered no real attention maybe because I am from India where the general tendency is to give away private information instead of paying for an app even though it is a one time purchase.

Just curious though, can I chat with ECHOECHO?

App Privacy

The developer, Threema GmbH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Contact Info
  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Wallet

    Get all of your passes, tickets, cards, and more in one place.

  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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