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Re:COI – Chat Over IMAP by supermatt on Thursday February 21, 2019 @07:07AM (#19216228)
Primarily I guess this is an open specification, whereas deltachat is a closed app? sounds like the same underlying principle to me though. Apparently in the future there would be optional extensions on IMAP servers to make things more efficient.

EDIT: looks like delta.chat is open source https://github.com/deltachat/deltachat-desktop

Re:COI – Chat Over IMAP by dmacvicar on Thursday February 21, 2019 @07:16AM (#19216283)
Deltachat is opensource for every platform it supports: https://github.com/deltachat

It also includes a core library in C: https://github.com/deltachat/deltachat-core

The spec is documented here: https://github.com/deltachat/spec/blob/master/spec.md