Slack is free to use for as long as you want and with an unlimited number of people.
Sign up for freeThe 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.
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 appsThousands of happy customers, including:
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@SlackHQ I love you for how you help us focus and make decisions when every opinion truly matters. #slack
— Aclipsa (@Aclipsa) July 9, 2015 -
Dear @SlackHQ ‐‐ I really don't think working remotely would be possible without you. Deeply grateful for your awesome software!
— Charity Stebbins (@CharityStebbins) July 2, 2015 -
@SlackHQ, you really are the illegitimate offspring prodigy of BBS and IRC, your usefulness is never-ending, I'm building a shrine outback
— Bogdan Costea (@BogdanCostea) July 3, 2015 -
trying out @SlackHQ for integration into classes. The amount of integration w/ other programs is great! #highered #profchat #onlineteaching
— Jason Parker (@drparkerjl) July 6, 2015 -
We have integrated @SlackHQ with our work order system and it is awesome. Notifications of assigned WOs, better discussion on Urgent WO, etc
— Brad Proctor (@bradproctor) July 8, 2015 -
I don't think there's a better tool than @SlackHQ for managing rapid change in organisations.
— philbalderson (@philbalderson) June 3, 2015 -
I'm a huge fan of @SlackHQ not sure why I ever used anything else #startups should b using this along w/anyone else collaborating as a team
— Casey Carr (@Carr11) June 3, 2015 -
Finding the move to @SlackHQ has improved culture at @SecInnovation significantly. More people are talking and working together. Plus, gifs!
— Luchia Bloomfield (@luchiamae) June 3, 2015 -
In < 6 months, @SlackHQ has become the backbone of our firm's communication. Most important software we use. @chamath
— Brad Gerstner (@altcap) June 19, 2015 -
Loving @SlackHQ for my on line HST course this semester. There is much potential in higher ed.
— R.J. Stansbury (@rjstansbury1) July 3, 2015
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!