A messaging app for teams.

All your communication in one place, integrating with the tools and services you use every day.

Slack is free to use for as long as you want and with an unlimited number of people.

You can easily upgrade to our paid plans, which offer more features and controls.

The funny thing is, it actually works.

Group conversations

Talk, share, and make decisions in open channels across your team, in private groups 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 sync—pick up right where you left off.


Over 80 integrations

It’s not ‘yet another app’ 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.

Security

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.

Learn what Slack can do for you.
Take a tour

Say goodbye to those neverending email threads.

We spend 47% of our time just reading, answering, and searching email to gather what we need to do real work. Slack helps you work in the moment — making it faster and easier to communicate with your team, with all the collective knowledge at your fingertips. More productivity, more transparency, and less email. That’s Slack.

Like your team’s collective brain.

Slack integrates with over 80 external services to help you pull information from outside tools in a way that’s timely, relevant, and always searchable. No more switching between apps. Bring it all together in one simple place.

See all integrations

Wherever you go.

Stay in sync with native apps for iOS and Android. Send messages, share files, get notifications, search your team archives, and more — we built our apps to give you a full-featured experience on any device you prefer.

See all apps

Thousands of happy customers, including:

Companies using Slack include BuzzFeed, Dow Jones, ebay, Expedia, Harvard University, Intuit, NASA, NBCUniversal, Salesforce, and The Wall Street Journal. Companies using Slack include BuzzFeed, Dow Jones, ebay, Expedia, Harvard University, Intuit, NASA, NBCUniversal, Salesforce, and The Wall Street Journal.

More at our Wall of Love

“So yeah, we tried Slack…”

The team at the Sandwich Video company tried Slack, and turns out that it really did change the way they communicate!

Slack is free to use for as long as you want and with an unlimited number of people.

You can easily upgrade to our paid plans, which offer more features and controls.