What is this Slack thing, anyways?

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One of 8,647 tiny love letters on the โ€‹Slack Wall of Love

Slack is a messaging app for teams.

Imagine all your team communication in one place, instantly searchable, available wherever you go. That's Slack.


Group conversations

Talk, share, and make decisions in open channels across your team, in private channels for sensitive matters, or use direct messages one-to-one.

File sharing

Drag and drop files, documents, PDFs, images, and videos to share with anyone and get immediate feedback and discussion through comments.

Deep, contextual search

Search across your entire team archives, within documents, files, or images, and filter your results by recency, relevancy, person, and more.

Always in sync

Everything you do on our desktop app is reflected on our fully native iOS and Android apps, and vice versa. Everything is in syncโ€”pick up right where you left off.โ€จ

Over 150 integrations

Itโ€™s not โ€˜yet another appโ€™ you have to use. Slack works with all the tools you already use; set them up to post notifications directly to Slack in a single work space.


All data transfer is encrypted (256-bit AES and TLS 1.2) on the desktop or the phone. We perform security testing regularly to identify and resolve any vulnerabilities.

We're on a mission to make your working life simpler, more pleasant and more productive.

Thousands of happy customers, including:

Airbnb, Time, Pinterest, BuzzFeed, EA, Pandora, Harvard University, LinkedIn, Samsung, Ogilvy, eBay, Autodesk, Ticketmaster, Condรฉ Nase, Urban Outfitters