Download Threema 4.2.1 for iOS / 3.0.0 for Windows Phone

Threema is a messaging app for Android, iOS and Windows Phone, with a focus on security. For example, it provides end-to-end encryption and generates as little metadata as possible. It is also a Swiss company, which means that the Swiss regulations are in force. The differences from other messaging apps are on this page explained. Version 4.2.1 for iOS and version 3.0.0 for Windows Phone have been released, with the following changes:

Threema 3.0.0 for Windows Phone

• New: Threema Safe, the anonymous backup solution for your most important Threema data
• Miscellaneous bug fixes
• Due to Windows Phone’s discontinuation, there will be no further Threema updates for this platform.

Threema 4.2.1 for iOS

• Update French localization

Threema 4.2 for iOS

• This update requires iOS 9.3 or later.
• Improved image quality of sent videos
• Security warning to prevent IDN homograph attacks when tapping on suspicious links
• Threema Web: Unsaved sessions will be deleted automatically after 24 hours of inactivity
• Minor Threema Safe improvements
• Minor voice call improvements
• Other improvements and various bug fixes