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Re:Delta Chat – WhatsApp Like Messenger over IMAP by psic4t on Wednesday February 27, 2019 @12:15PM (#19264814)
The COI FAQ says:

"We are cooperating with Delta.Chat for it to also use COI to provide more features, we are contributing to the C-Kernel of it."

Re:Delta Chat – WhatsApp Like Messenger over IMAP by olivier-tille on Thursday February 28, 2019 @03:10AM (#19269826)
Exactly, that's what I was told yesterday as well. They're collaborating on https://github.com/deltachat/deltachat-core