Delta Chat The European alternative to WhatsApp / Signal
Open Source SubmittedOpen-source messenger using the email protocol from Germany
Germany Messaging instead of WhatsApp / Signal
About Delta Chat
Delta Chat is an open-source messenger built by merlinux GmbH in Freiburg, Germany. Instead of operating a dedicated server, the app uses the email protocol as its transport layer. Messages route through so-called Chatmail relays or any standard email server, no account, phone number or central provider is required. Since version 2 (July 2025), end-to-end encryption based on OpenPGP and Autocrypt is enabled by default.
Highlights
- ✓ Email protocol as transport, no dedicated account or phone number
- ✓ End-to-end encryption by default (OpenPGP/Autocrypt) since version 2
- ✓ Federated: works with any email server or Chatmail relay
- ✓ Cross-platform (Android, iOS, Linux, macOS, Windows)
- ✓ Open source under GPLv3
Why European?
- → Developed by merlinux GmbH in Freiburg under EU data protection law
- → Decentralized and federated via open email standards, no central provider
- → Co-funded by the EU NEXTLEAP project, Sovereign Tech Fund and Open Technology Fund
- → Open source: fully auditable
Pricing
Free (open source)
Try Delta Chat
Open-source messenger using the email protocol from Germany
Visit Delta Chat Website → 
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