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Documentation
Cryptography Whitepaper
Analysis: Security of Ibex
The Forrester Wave™: Secure Communications Solutions, Q3 2024
Security Audit Report 2020
Security Audit Report 2019
Images
Logo and App-Icon
Threema Work
Videos
Threema
Threema: For individuals
Threema Work: For companies
2012
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2014
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2019
2020
2021
2022
2023
2024
Smartphones Become Popular
As smartphones start to become ubiquitous in the early 2010s, chat apps gradually begin to replace SMS as the de facto standard of mobile communication. However, all chat apps exhibit serious security flaws. Three young software engineers from Switzerland start to build a secure alternative.
“End-to-End Encrypted Messaging Application”
The app is called “End-to-End Encrypted Messaging Application,” “EEEMA” for short. Soon, the three “E”s are replaced by “Three,” and it becomes “Threema.”
The Number of Users Increases to 250,000 in No Time
The first Threema version is released on December 12, 2012, in Apple’s App Store. A few months later, the first Android version is released. The impact is tremendous; the user base quickly grows to 250,000. Threema has caught the spirit of the age.
Snowden Revelations Shock the World
By revealing the Prism surveillance program in mid to late 2013, Edward Snowden drastically raises the public’s awareness of privacy issues on the Internet. The scale of the global surveillance is alarming. All kinds of online communication have been intercepted. Concerned Internet users fundamentally question the communication channels they have been using to date.
Facebook Acquires WhatsApp: Threema’s User Base Grows Exponentially
After Facebook’s acquisition of WhatsApp in February 2014, Threema experiences a greater boost in growth than ever before. In a few weeks, the number of users climbs to 2 million.
The Company Is Run from the Kitchen Table
The founders are caught off guard by the enormous increase in downloads after the WhatsApp acquisition. In night shifts, they answer press inquiries, handle support requests, develop the app, and complete the most important business tasks.
Threema GmbH Is Established
Establishing a startup was planned for quite some time. In spring of 2014, it finally happens: The Threema GmbH is founded in Pfäffikon SZ. A team of experienced software developers is continuously working on refining the Threema app.
Introducing Threema Gateway
With Threema Gateway, an innovative and versatile API, which allows to send Threema messages via one’s own software, is introduced.
Steady Downloads and Venture into the Business Sector
Since the company’s establishment, the app downloads have remained steady. In 2016, Threema hits the mark once again with Threema Work, a chat service specifically tailored to the use in companies and organizations.
Encrypted Calls and Web Client
Threema Web enables chatting from the comfort of the computer without making cuts in security. With Threema calls, which are introduced shortly after, it is possible to conduct calls without having to disclose a phone number.
The Birth of the GDPR
With the introduction of the General Data Protection Regulation (GDPR), European companies are no longer allowed to use everyday messengers for business purposes.
Expansion of Professional Services
Threema Broadcast gets added to the portfolio, a professional tool for top-down communication. In addition, the Threema app is now also equipped with its own backup solution: Threema Safe allows to automatically store the most important Threema data anonymously, secure, and independent of the mobile platform.
Threema Passes Security Audit
The Münster University of Applied Sciences’ Lab for IT Security confirms the security of the Android and iOS app and Threema Safe.
Video Calls Suddenly Become Indispensable
The coronavirus pandemic heightens the need for video telephony, and Threema promptly responds with the introduction of video calls in Threema. By partnering with the German-Swiss investment company Afinum Management AG, Threema lays a solid foundation for continuity in company development and acceleration of product development.
10 Million Users
WhatsApp stirs up a controversy about data protection in messaging services by changing their privacy policy for the worse. In response, countless users switch to Threema. In addition to the web client, Threema can now also be used via its own desktop app.
A Google-Free Threema Version and a Big Birthday
Threema Libre, the Threema version that can be used without any Google services, gets introduced and is available via the alternative app store F-Droid. Also, Threema turns ten on December 12, 2022.
New Communication Protocol “Ibex”
Shortly before the year comes to an end, Threema strengthens its security further with the new communication protocol “Ibex,” and the protocol portfolio is extended with new components for end-to-end encrypted group calls and the upcoming multi-device solution.
Security Proof of “Ibex”
German researchers provide a formal security proof of the new communication protocol, “Ibex,” confirming that Threema’s security is based on a rock-solid foundation.
Group Calls and a New Generation of the Desktop App
With the introduction of group calls, all Threema users can conduct end-to-end encrypted voice and video calls in group chats. The development of the next generation of the desktop app is also making progress: iOS users can already test the multi-device functionality and chat from the computer independently of a smartphone.
Increased Availability of Threema
Despite the general trend of abandoning cash in favor of electronic payment methods, Threema’s Android app can now be purchased completely anonymously with cash. In addition, a partner program is launched to ensure the availability of Threema Work around the globe and provide first-hand support via local service providers.
Threema Available in Swiss German
As a Switzerland-based company, we mostly speak Swiss German with each other. That’s why we’re particularly happy to be able to now use the app in the dialect spoken in the Zurich Oberland region.
Edit Sent Messages
One of the most frequently requested features is making its way into the Threema app: the ability to edit sent messages and delete them on the recipient’s end.
A New Face in the Management
After twelve years – and after Threema has become an internationally successful company and a benchmark in terms of data protection – the founders are stepping back from operational activities to pursue new projects. Threema’s new CEO has extensive experience in product development and, in addition to continuing Threema’s rigorous privacy approach, will focus on the development of important features.
The Forrester Wave™ Names Threema a Leader in Secure Communication
We are proud to have been recognized by Forrester as a Leader with the largest market presence in the field of secure communication solutions for companies.
Threema Is and Shall Remain a Statement for Privacy
To this day, its comprehensive security and the unparalleled privacy protection set Threema apart from conventional instant messengers. Threema is more than just a chat app. Threema is a statement. A statement for privacy.
Available Since
2012
Number of Users
12M
Number of Corporate Customers
8,000+
68,000 Play Store Reviews
4.4 of 5
Threema in the Media
General
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:
- Privacy as a guiding principle: 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.
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.
| 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
- Brazilian Portuguese
- Catalan (Android)
- Chinese (traditional and simplified)
- Czech
- Dutch
- French
- German
- Hungarian
- Italian
- Japanese
- Norwegian (Bokmål)
- Polish
- Romansh
- Russian
- Spanish
- Slovak
- Swiss German
- 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:
- Educational institutions benefit from the price plan Threema Education.
- NGOs are granted a 30% discount on Threema Work.
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.
First of all, if you have recently used your Threema ID on another device (i.e., if you have switched devices or if you have turned on a device that has been lying in storage), you can ignore this warning. To prevent it from (re)occurring when changing devices, it’s recommended to uninstall Threema on the previous device and then restart the current one.
If, however, you are certain that you’re not using your Threema ID on any other device, then your private key may be compromised. You should revoke your Threema ID and follow the steps listed below before creating a new ID.
- Ensure your device’s software is up to date
- If system updates are no longer available for your device, consider replacing the device with a current model
- Check your device for malware; when in doubt, reset the device
- Avoid “rooting” or “jailbreaking” your device
- Change passwords of important user accounts
- Lock your device and the Threema app with a passcode
- Don’t use easy-to-guess passwords (especially for Threema Safe), and never reuse the same password for different purposes. Use a password manager.
- Delete and reinstall the Threema app from an official source before creating a new ID. Please note that you will lose all Threema data (chat history, contact list, etc.), which is why you should export this data (in case you still need it) before reinstalling the app.
No, once the app has been purchased, there are no recurring costs. We don’t charge recurring fees, and there aren’t any paid extra features.
Please note, however, that licenses cannot be transferred between sales platforms. Therefore, when switching to a different operating system (i.e., from Android to iOS), Threema has to be purchased again. Further details about reinstalling Threema can be found in this FAQ entry.