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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 Provides a web client
You can control and message with friends via Threema Web, the official web client for Threema.
Pro Company behind Threema is based in Switzerland
Pro Supports encrypted group chats
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 Servers in Switzerland
Privacy laws protect the data Threema has.
Con No cloud sync
E2E encryption means no cloud syncing of messages.
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.