Cyph vs SimpleX Chat

Cyph is a privacy-focused messaging and social networking service for secure conversations, video meetings, and encrypted storage. It offers private instant messaging, encrypted group video calls, and scheduled meetings. Cyph Vault stores files, passwords, notes, cryptocurrency, and other data in encrypted cloud storage. The service is available on Android, iOS, Linux, macOS, web, and Windows, including a browser app that needs no download. Cyph says WebSign checks the integrity of its web application each time it opens, and that multiple quantum-resistant ciphers protect data against future quantum-computing advances. It also says it automatically helps prevent impersonation without requiring manual fingerprint verification. The site reports that a Cure53 security audit found no major issues in application security or cryptographic implementations. Cyph Telehealth adds live group sessions, unlimited patient sessions, one-click onboarding, and secure notes, forms, and history. It describes Telehealth as beyond HIPAA-compliant and says it includes a BAA. Cyph has a free plan; paid pricing starts at $3/mo (annual).

SimpleX Chat is a messaging application for the SimpleX platform, with apps for Android, iOS, Linux, macOS, and Windows. It supports encrypted text with Markdown and editing, media and file sharing, decentralized groups, voice messages, disappearing messages, and audio and video calls. The network does not assign profile identifiers such as phone numbers or usernames. Messages and metadata use end-to-end encryption with continuous post-quantum key exchange. Four servers participate in each chat so relay servers cannot see which IP addresses communicate. Profiles, contacts, and messages remain in a portable encrypted database on user devices; relay servers hold encrypted messages only until delivery. Users may operate their own servers and still reach people using preconfigured servers. Developers can build bots and integrations using protocol SDKs; the TypeScript SDK connects to the Chat CLI over a WebSocket API. A phone or tablet can link to the desktop app only when both devices share a local network. Disappearing messages and recipient-side deletion are not guaranteed when a recipient device is offline or modified. The free plan costs nothing.