A private messaging platform with no user identifiers, using disposable relay nodes for metadata protection.
SimpleX Chat is a private messaging platform that operates without any user identifiers, protecting both message content and metadata. It uses a unique network of disposable relay nodes to deliver messages, ensuring that who you communicate with remains hidden. The platform solves the problem of metadata leakage common in other encrypted messengers.
Privacy-conscious individuals, activists, journalists, and developers who require secure communication without exposing their social graphs. It's also suited for organizations needing self-hosted, decentralized chat solutions.
Developers choose SimpleX for its unique architecture that eliminates user identifiers entirely, providing stronger metadata protection than Signal or Matrix. Its open protocol, self-hosting capability, and support for chat bots offer full control and extensibility.
SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!
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Uses pairwise per-queue identifiers instead of user IDs, eliminating metadata about social connections as described in the whitepaper and FAQ.
Implements double ratchet encryption with quantum-resistant key exchange on every step, highlighted in the v5.6 release announcement for future-proof security.
Allows users to run their own SMP servers while communicating with others, supporting decentralization and control as outlined in the self-hosting section.
Contact is only possible via one-time invitation links or temporary addresses, reducing spam without centralized moderation, per the privacy features.
Roadmap items like automatic queue rotation and message mixing are not yet implemented, limiting full privacy protections as admitted in the technical details.
Requires sharing links or QR codes for each contact, which is cumbersome compared to identifier-based systems like Signal or Matrix.
Smaller user base and fewer third-party integrations than established messengers, affecting adoption and tooling for developers.
Default servers have no SLAs and are provided on a best-effort basis, which may not suit mission-critical applications.
SimpleX Chat is an open-source alternative to the following products:
Telegram is a cloud-based instant messaging service known for its speed, security, and support for large group chats and channels.
WhatsApp is a cross-platform messaging and voice-over-IP service owned by Meta that allows users to send text messages, make voice and video calls, and share media.
Signal is a secure messaging app that provides end-to-end encrypted voice calls, video calls, and text messaging for private communication.