Hooray! Threema for Windows Phone will be released this Thursday, November 27. In celebration of the day the first 10'000 users will get Threema at half price! Note the date and tell your friends

Show your friends and family how convenient secure communication and privacy protection can be. The Threema Shop for Android and the iTunes App Store make it possible to present your loved ones with Threema in just a few simple steps.

Gift for iOS Users

• Go to the Apple App Store and search for Threema
• Tap on the detailed view
• Tap right on top on the corner on forward and choose «Gift»
• Follow the further instructions given on the screen

Gift for Android Users

• Purchase one or more licenses in our Threema shop
• After succesful payment you will receive an email with the license keys
• Distribute the license to your presentee, for instance by email
• Your loved ones can redeem the licenses here
• New versions of the app can be automatically updated using the «About Threema» screen

Threema has many features and with any update new are coming. Some are obvious some not and sometimes it’s easier to learn something looking at a video than looking up itself. Therefore we publish tutorial clips on our youtube-channel. Youtube Channel

The registration for the beta tester program Windows Phone is closed. We will start with beta testing soon.

Gradually but steadily. The Windows version of Threema stands in the wings. The beta phase will start soon and we are looking for beta testers. Sign up now! Beta Tester Application

Mobile messaging apps are more popular than ever, but what security and privacy is concerned, the big names leave a lot to be desired. The Threema app offers a proven, serious and trustworthy alternative. Have fun with our new video clip.

The leading German consumer safety organization Stiftung Warentest has scrutinized the five most popular instant messengers in Germany with regard to data protection and security. The result: Only Threema was deemed «non-critical». The other apps were considered «very critical» or «critical» by the independent foundation. (Zeit online, February 27, 2014)

Threema is the clear winner of the comprehensive messenger comparison by internet security experts PSW GROUP. Other popular messenger services ranked far behind. (it-daily.net, July 26, 2014)

Good news! Threema for Windows Phone 8 is coming in autumn. No release date has been set yet but we'll keep you posted.

Threema uses true end-to-end encryption from the sender to the recipient based on established and renowned cryptography. An additional encryption layer providing Perfect Forward Secrecy (PFS) ensures that the meta data (information regarding who communicates with whom) cannot be intercepted during transport. The second fundamental difference between Threema and other mobile messengers is that Threema does not collect, mine or sell any data. You can use Threema anonymously, without providing a phone number. In summary:

• True end-to-end encryption
• Perfect Forward Secrecy (PFS) on data transport layer
• No data is collected, mined or sold
• Fully anonymous use possible
• Simple confirmation of trusted contacts with QR code
• Independent company, with no external financial interests
• Clear privacy policy
• Servers located in Switzerland

More info: Press-Info and Privacy Policy

For detailed technical information about the cryptography in Threema, read the Cryptography Whitepaper.

There is a validation log feature in the app that can be used for independent verification of the end-to-end encryption. See here for details.