Threema

The Threema app is a unique private messenger that offers a variety of features and aims at keeping your data safe and secure. Created to manage your data efficiently this app does not store any of your messages on its servers and prevents the collection of your personal data. 

With this app, you can send text and voice messages, share images, location, and videos, create groups, choose between different themes, synchronize your contacts and even scan any individual with the help of a QR code. 

For optimal privacy, the app gives each user a unique ID.

Pros

The Threema app is not free to download, hence, comes without ads. It provides you with brilliant features and a well-designed user interface to enhance your messaging service.

Cons

Some messages that are sent via the app do not get delivered on time and sometimes take days. The app does not allow you to restore backup data.