SimpleX Chat
Encrypted messaging that avoids usernames, phone numbers, and user IDs.
SimpleX Chat is an open-source secure messenger built around direct private connections rather than persistent account identifiers. Users connect by link or QR code, then use encrypted chats, groups, calls, file sharing, and community channels without a central user directory. The project also publishes protocol documentation, audits, server-hosting guides, and developer tools for bots and integrations.
Why it stands out
- Avoids even random long-term user identifiers, reducing metadata that many encrypted messengers still retain.
- Contacts, groups, and channels are stored on user devices rather than in a central account database.
- Anyone can run network servers, so the project is not tied to a single infrastructure operator.
- Provides unusually deep technical transparency, including protocol docs, reproducible-build information, audits, and server-hosting guides.
Good to know
- New connections require sharing a link or QR code, so it does not work like a username- or phone-number-searchable messenger.
- Because contacts and groups live on devices, users should pay attention to the app’s data-management and backup guidance.
- Running your own servers is possible but requires technical setup and maintenance.
- The site describes future paid community/server funding plans, so large communities may face different cost considerations over time.
Under the radar: If you are evaluating it for a community, read the server-hosting pages as well as the app guide—the network model makes more sense once you see how SMP, XFTP, relay, and WebRTC servers are separated.
Photos
Privacy-conscious individuals and communities that need encrypted chat without tying conversations to phone numbers, usernames, or platform-controlled accounts. Start a one-to-one chat by sharing a private invitation link or QR code. Create group conversations or channels where membership data stays on participants’ devices. Use audio and video calls when a conventional messenger’s account model is a concern. Run supporting server infrastructure for a community instead of relying only on default network operators.
End-to-end encrypted messaging, groups, file transfer, and audio/video calls Connections created through links or QR codes rather than global user IDs Open-source apps with published whitepaper, protocol references, and security-audit links Decentralized server model with guides for hosting SMP, XFTP, chat relay, and WebRTC servers Directory for discovering SimpleX communities and channels
Technical Notes
- Developer-facing tools are published for automation and integrations, including a TypeScript SDK, Terminal CLI, and SimpleX bots API.
Alternative listings
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Privacy & security tools / big-tech alternativesSession is an open-source private messenger built around end-to-end encryption and a decentralized routing network. Instead of requiring a phone number or email address, it uses account IDs and routes messages through community-run nodes to reduce exposed metadata. It supports one-to-one chats, disappearing messages, group conversations, and larger community chats.
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Privacy & security tools / big-tech alternativesElement is a secure messaging and collaboration platform built on the decentralized Matrix standard. It serves both personal users and organizations that want end-to-end encrypted chat, calls, federation between separate servers, and the option to run communications infrastructure under their own control. Its enterprise focus includes public-sector, defense, air-gapped, and cross-organization collaboration scenarios.
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Similar sites elsewhere
- Signal — signal.org
- Session — getsession.org
- Briar — briarproject.org
- Matrix — matrix.org
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