Threema
 |
|
| Developer(s) | Threema GmbH |
|---|---|
| Initial release | December 2012 |
| Stable release |
iOS Android 1.6.4 (December 13, 2016) |
| Written in | Objective-C (iOS), Java (Android), C, .NET (Windows Phone) |
| Operating system | iOS, Android, Windows Phone |
| Available in | English, German, French, Spanish, Italian, Russian, Brazilian Portuguese, Polish |
| Type | Encrypted instant messaging |
| License | Proprietary |
| Website | threema |
iOS
2.8.0 (December 12, 2016)
Android
2.94 (December 5, 2016)
Threema is a proprietary encrypted instant messaging application for iOS, Android and Windows Phone. In addition to text messaging, users can send multimedia, locations, voice messages and files.
The name Threema is an acronym for EEEMA and stands for end-to-end encrypting Messaging Application.
Threema is developed by the Swiss company Threema GmbH. The servers are located in Switzerland and the development is based in the Zürich metropolitan area. As of June 2015, Threema had 3.5 million users, most of them from German-speaking countries.
Threema was founded in December 2012 by Manuel Kasper. The company was initially called Kasper Systems GmbH. Martin Blatter and Silvan Engeler were later recruited to develop an Android application that was released in early 2013.
In Summer 2013, the Snowden leaks helped create an interest in Threema, boosting the user numbers to the hundreds of thousands. When Facebook took over Whatsapp in February 2014, Threema got 200,000 new users, doubling its userbase in 24 hours. Around 80% percent of those new users came from Germany. By March 2014 Threema had 1.2 million users.
In Spring 2014, operations have been transferred to the newly created Threema GmbH.
In December 2014, Apple listed Threema as the most-sold app of 2014 at the German App Store.
Threema uses a user ID, created after the initial app launch by a random generator, instead of requiring a linked email address or phone number to send messages. It is possible to find other users by phone numbers if the user allows the app to synchronize their address book. Users can verify the identity of their Threema contacts by scanning their QR code, when they meet physically. The QR code contains the public key of the users. Using this feature, the users can make sure they have the correct public key from their chat partners, which provides security against a Man-in-the-middle attack. Threema knows three levels of verification (certainty levels of the contact’s identity). The verification level of each contact is displayed in the Threema application as dots next to the corresponding contact.
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Wikipedia