An interesting rating and comparison done of Signal, Threema, WickrMe, Keybase, TwinMe, Conversations, Briar, and the newcomer BCM Messenger (iOS and Android) but which looks very promising and has a desktop version in the works. BCM Messenger transmits everything encrypted, even for the groups (up to 100,000 members) and requires no e-mail address or phone number to register. Offline Chat supports multi-hop ad-hoc network, with Bluetooth/Wi-Fi interconnections, so that in a specific area, the more people are using the app, the bigger coverage.
Criteria used for the section and comparison:
* This list is focused on instant messaging and chatting as the primary usage of the app
* Apps without trackers given preference
* Clients on multiple platforms preferred
* Does not expose personal information (for example phone number or email) to other users
* Does not leak data (pictures or other data saved unencrypted in browseable folders)
* Has ephemeral messages (encryption keys destroyed after a set time)
* Has contact verification through key fingerprint or other method
Below each summary is a link to a bit more detail about the review of each one.
See My list of favorite secure messaging apps
Step-by-step guides and detailed information on secure messaging apps for Android, iOS, Windows, Mac and Linux. Here is a list of the criteria I use to pick the best options. Each app may not have all of these characteristics, but the more that the app has of these in the list the better it will score. Testing is done on both Android and iOS when...