Delta Chat

Delta Chat provides instant messaging that operates over standard email infrastructure, allowing users to send and receive messages without relying on a centralized server. It encrypts communications end‑to‑end and supports multiple profiles and devices, enabling the same account to be used across a phone, tablet, or computer. The application connects to interoperable “chatmail” relays, which act as gateways for delivering encrypted messages between participants.

The client is built for macOS and runs as a native application, offering a familiar desktop experience while maintaining the decentralized architecture. Users can create separate chat identities, manage contacts, and exchange messages in real time, with the system handling synchronization across devices automatically.

Because it leverages existing email protocols, Delta Chat can interoperate with any email service that supports the required standards, making it a flexible choice for individuals or groups seeking a secure, server‑independent messaging solution.