SimpleX Chat – European messaging app
A UK-built messenger that is the first with no user identifiers of any kind - no phone number, no username, not even a random ID. End-to-end encrypted, fully open source, and decentralised across relay servers, making it one of the most metadata-resistant chat apps available.
Quick facts
It's the rare messenger with no user ID of any kind – not a phone number, not a username, not even a random identifier – so there's nothing tying your account to your identity even if a server is compromised.
The lack of any persistent identifier means contact discovery and multi-device sync work differently from apps like Signal, which takes some getting used to.
Why does it score 90?
Incorporated in London, UK – outside the EU/EFTA, which caps the legal score even though it's a European company.
Independently run, funded by grants and community support rather than investors.
There's no central account database at all – SimpleX uses temporary relay addresses instead of persistent user IDs, and you can self-host your own relay.
Fully open source and GDPR-compliant, with a genuinely unusual design that avoids user identifiers entirely.
See how they compare
SimpleX Chat
Signal
Whatsapp 
Telegram 
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