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Threema. Secure Messenger

Secure. Anonymous. Private.

Developer: Threema GmbH

Purchase date: 23.12.2020 for 1.99 EUR. Threema apps are open source since 21.12.2020! Threema is celebrating with a 50% discount until 28.12.2020.
Purchase price: 3,99 EUR (regular price. One-time, no subscription, no advertising! You do not pay with your personal data!)

Rating: ***** 5 stars

Compatibility: requires iOS or iPadOS 10.0 or higher
Compatible with iPhone, iPad and iPod touch

Languages: German, Basque, English, French, Italian, Dutch, Polish, Portuguese, Russian, Romansh, Spanish, Czech, Turkish.




Test Conclusion: highly recommended!

It is not a real disadvantage that Threema's server software is not open source. Thanks to «Security and Privacy by Design» without a central user account with decentralised storage of customer data exclusively on customer devices, Threema's servers only serve as relay stations anyway.

Security experts also recommend Threema as a secure messenger.


Mike Kuketz: Messenger: Threema-Client nun Open-Source (German)

Dr.-Ing. Mario Heiderich: Pentest & Audit Report Threema Mobile Apps 10.2020 (PDF)

YouTube: TWiT Tech Podcast Network: Threema Goes Open-Source

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Keyword list: Advantages, Apps, Chat, Client, Conclusion, Disadvantages, End-to-end encryption, Groups, IT, Mobile Apps, Network, Open Source, PDF, Privacy, SIM, Server, Software, Threema, User, iPhone, report

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