Delta Chat – messaging software that works with e-mail

In Operation

Here’s an image of Delta Chat in action.

Delta Chat in action

The software uses Push-IMAP, an email protocol designed as a faster way to synchronise a mobile device like a smartphone to an email server.

Other features include:

  • Supports HTML emails, images, videos and other attachments.
  • Built with security in mind:
    • Autocrypt is used for automatically establishing end-to-end encryption with contacts and group chats. Autocrypt uses a limited and secure subset of the OpenPGP standard.
    • Secure-Join protocols are used for establishing chats with guaranteed end-to-end encryption which protects against network attacks and compromised servers.
    • Data is not saved on a central server unless all users are using the same e-mail servers.
  • Use Delta Chat on multiple devices at the same time.
  • Share webxdc apps, attachments with an .xdc file extension.
  • Database encryption (experimental).


Delta Chat is a messenger that uses the largest, most diverse and decentralized communication system ever created: the existing email server network.

Our opinion is somewhat mixed. While it’s great that we can converse with all our contacts with a single app given that it doesn’t need a centralised server, its email functionality pales compared to a good email client like Thunderbird.

Unlike Signal, Delta Chat doesn’t support Perfect Forward Secrecy (PFS).

Support: GitHub Code Repository
Developer: DeltaChat contributors
License: GNU General Public License v3.0

Delta Chat is written in TypeScript. Learn TypeScript with our recommended free books and free tutorials.

Pages in this article:
Page 1 – Introduction and Installation
Page 2 – In Operation and Summary

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