1. Threema
Thanks to state-of-the-art end-to-end encryption, no one other than the intended recipient can read transmitted messages, not even Threema as the service operator. It’s not required to provide any personal data whatsoever: If so desired, Threema can be used completely anonymously, i.e., without disclosing one’s phone number or email address. Threema was built from the ground up with data protection and privacy in mind (Privacy by Design), which is why only as little metadata as possible is generated when using the service.
Threema is 100% Swiss Made, hosts its own servers in Switzerland, and, unlike US services (which are subject to the CLOUD Act, for example), it is fully GDPR-compliant.
Pros:
●Pay once, chat forever.
●No collection of user data. Open Source
●Built from the ground up to be private and anonymous
Cons:
●It’s not free
●Limited user base
2. Signal Private Messenger
State-of-the-art end-to-end encryption (powered by the open source Signal Protocol) keeps your conversations secure. We can’t read your messages or listen to your calls, and no one else can either. Privacy isn’t an optional mode — it’s just the way that Signal works. Every message, every call, every time.
Pros
●Highly-secure
●No corporate interest
●Open source code
Cons
●Not as polished as mainstream mega chat apps
●Network performance isn’t always great
Cloud REBOOT 