Signal is the most scalable encryption tool. Developed by Open Whisper Systems
License: Open Source
Matrix is an open protocol for real-time communication. It is designed to allow users with accounts at one communications service provider to communicate with users of a different service provider via online chat, Voice over IP, and Videotelephony. Developed by Matrix.org
License: Open Source
Matrix.org offers a decentralized, feature-rich communication platform suitable for various formats, while Signal emphasizes privacy and security with a simpler user experience. Both platforms provide end-to-end encryption, but Matrix's flexibility and customization make it ideal for advanced users and organizations.