Slack

Overview

A messaging app for work, organized into channels by team, project, or topic, with direct messages and calls.

General use

Companies use it as their main internal chat, sharing updates and files, and connecting other tools so notifications land in one place.

Insight

Good at keeping team chat organized by channel and at pulling other tools' alerts into one place. The always-on nature makes it a constant interruption, and real decisions get buried in scrolling history where nobody finds them later. The free plan now hides older messages. Best paired with team rules about what belongs in a channel versus a written document.