What is a Threema ID?

In contrast to other messengers, your identity in Threema does not depend on a phone number. Each Threema user gets a randomly generated, 8-digit Threema ID when starting the app for the first time. This ID is your unique address in Threema and makes it possible to use Threema completely anonymously, without disclosing any personal information.

Your Threema ID is just one of two components that make up your identity in Threema. The other one is the so-called key pair (consisting of a public key and a private key) which is essential for the encryption. Your Threema ID is permanently tied to your public key. While the public key is sent to Threema’s servers to be distributed to your chat partners, the private key remains on your device where it is securely stored. All messages directed to you will be individually encrypted with your public key on the sender’s device. They can only be decrypted with your personal private key.

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Threema started as an abbreviation: “EEEMA,” for “End-to-End Encrypted Messaging Application.” The three “E”s were a bit unwieldy, so it became “Threema.”

Threema is the world’s best-selling secure messenger. It sets itself apart from others in the following respects:

  • Guaranteed privacy: Threema is designed to generate as little data on servers as technically possible.
  • Full anonymity: You are not forced to provide any personal information (such as your phone number or email address) in order to use Threema.
  • Open source: To provide full transparency, the Threema apps are open source. Anyone knowledgeable enough can confirm Threema’s security on their own.
  • Optional contact synchronization: It’s not necessary to grant access to the address book in order to use Threema.
  • Comprehensive encryption: In Threema, all your communication is end-to-end encrypted – not just text messages and voice and video calls but also group chats, media files, and even status messages.
  • Rich functionality: Threema is versatile and feature-rich.

Find out how Threema stacks up against other messengers like WhatsApp, Signal, or Telegram in the comprehensive messenger comparison and the in-depth comparison of Threema and WhatsApp.

With Threema Work and Threema Gateway, Threema also provides solutions for secure communication in business contexts. 

Android iOS
Phone iPhone
Tablets iPad
Wearables* (e.g., Smartwatch) Apple Watch*
Android Auto Apple CarPlay

Threema is fully supported.

Threema is not supported.


* If you are using Threema with an Android Wear smartwatch or an Apple Watch, you can read message previews, see chat pictures, agree/disagree to incoming messages, and answer messages using dictation (or using Scribble on an Apple Watch).

Threema is currently available in the following languages:

  • English
  • Basque (Spain) (iOS)
  • Brazilian Portuguese
  • Catalan (Android)
  • Chinese (traditional and simplified)
  • Czech
  • Dutch
  • French
  • German
  • Hungarian
  • Italian
  • Japanese
  • Norwegian (Bokmål)
  • Polish
  • Romansh
  • Russian
  • Spanish
  • Slovak
  • Turkish
  • Ukrainian

If Threema doesn’t support the device’s system language, the user’s preferred languages (as defined in the system settings) will be taken into account. If these languages aren’t available in Threema, English serves as fallback.

Is Threema not yet available in your language? Support the translation here:

Threema is primarily intended for personal use. For corporate use, please consider our business solutions Threema Work and Threema OnPrem, which are tailored to the needs of companies and organizations.

Yes. Special offers are available for schools, universities, and NGOs:

Yes. Both servers and offices only use energy from renewable sources.

The development of the Threema apps and the maintenance of the server infrastructure generates costs. The app price covers these costs.

If we wanted to offer our apps for free, we would have to monetize user data, which, of course, would totally undermine Threema’s purpose (i.e., to protect the users’ data and privacy). Besides, Threema is designed from the ground up to only generate as little user data as technically possible, so there’s next to no user data to begin with.

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Show all FAQs