When comparing Threema vs Facebook Messenger, the Slant community recommends Threema for most people. In the question“What are the best Skype alternatives?” Threema is ranked 10th while Facebook Messenger is ranked 37th. The most important reason people chose Threema is:
Registration is handled by random generated IDs. No phone number needed.
Specs
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Pros
Pro Registration without phone number
Registration is handled by random generated IDs. No phone number needed.
Pro Encrypted communication
Provides complete end-to-end encryption.
Pro Company behind Threema is based in Switzerland
Pro Servers in Switzerland
Privacy laws protect the data Threema has.
Pro Supports encrypted group chats
Pro Provides a web client
You can control and message with friends via Threema Web, the official web client for Threema.
Pro Ability to send pics and videos
Threema supports sending media messages such as video, pics and even voice messages.
Pro Group chat polls
Pro Allows verification of contacts identity via QR Code
Pro Chat head for quick access
Only for android platform though!
Cons
Con Not free
Unlike many other options Threema is not free as it costs $1.99 for the app.
Con Single device only
You cannot use multiple devices to send messages. However, it does have message mirroring on a web client.
Con No cloud sync
E2E encryption means no cloud syncing of messages.
Con Owned by Facebook
Con Cluttered user interface
Messenger has so many features accessible from one page that it is often difficult to find what you're looking for.
Con End-to-end encryption only in "Secret" conversations
If you want e2e encryption, you need to start a secret conversation.
Con Not very customizable
With so many features in one app, it's very possible you might not be a fan of at least one of them. Too bad you can't disable anything in settings.