Delta Chat is a decentralized and secure messenger app that is completely compatible with the existing e-mail infrastructure. So, with Delta Chat you get the ease of well-known messengers with the reach of e-mail. Some features at a glance: 💬 Reliable instant messaging with multi-profile and multi-device support. ⚡️ Sign-up easily using secure fast chatmail servers. You don’t need a phone number or any private data. 📧 Alternatively, use your existing classic e-mail address to read your inbox as chats. 🎮 Interactive mini-apps in chats for gaming and collaboration. 🔒 Audited end-to-end encryption safe against network and server attacks. 🆓 Fully Open Source/Free Software, built on Internet Standards.