Threema

About Threema

Threema is a privacy-first encrypted messaging app based in Switzerland that requires no phone number or email address to register. It uses end-to-end encryption for all messages, voice calls, group chats, and file transfers. Threema generates a random Threema ID for identity, stores minimal metadata, and its source code is fully audited and open. It also offers Threema Work for secure business communication.

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