Slack UI design & app screens

Slack is a team messaging platform organized around channels, threads, and direct messages, with deep integrations into other work tools. It's the communication hub for many companies.

The interface is a reference standard for chat-based collaboration: a persistent sidebar of channels and DMs, threaded conversations, rich message composition, and a thoughtful notification model. Designers study its emoji reactions, slash-command patterns, huddles, and the way its colorful, personable brand coexists with dense professional use.