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.