Team chat with first-class threading
There are a lot of team chat apps. So why did we build Zulip? We talk about Slack in the discussion below, but the problems apply equally to other apps with Slack's conversation model, including Hipchat, IRC, Mattermost, Discord, Spark, and others. Anyone who wakes up to this frequently can tell you it is not fun.
Reading busy Slack channels is extremely inefficient