◢Slack vs Teams, decided in five minutes
We have run both Slack and Teams inside real companies, paid both bills, and watched teams quietly hate both at different times. So when a founder asks us "slack vs teams," we do not open a 40-row feature grid. We ask one thing: are you already paying Microsoft for email and Office?
If yes, Teams is basically already in your account, waiting. If no, Slack is the nicer place to spend your days. That one fact decides more than any feature comparison ever will.
Here is the part the vendor blogs bury: most small teams are paying for chat twice. They buy Microsoft 365 for email, then buy Slack on top because it feels better, then wonder where the SaaS bill went. Teams now has around 320 million monthly active users, largely because it rides for free on Microsoft 365 (Microsoft). Slack stays smaller, with roughly 40 to 48 million daily users, because people choose it on merit (Business of Apps). Nobody pays us a cent to recommend either one. This is the honest pick, plus the usual Cut The SaaS angle: what to cut before you spend more.
◢What is the real difference between Slack and Teams?
Slack is a chat-first tool that does one thing extremely well, then connects to everything else. Teams is a bundle that crams chat, video calls, and file storage into the Microsoft 365 box you may already buy. Slack wins on polish and integrations. Teams wins on price and on being already paid for.
That framing matters more than any single feature. Slack was built as a standalone product people had to choose and love. Teams was built to be the default inside every Microsoft account, which is why its user numbers dwarf Slack's even though plenty of people grumble about it.
In practice, Slack feels like a fast, focused messaging app with a great search bar. Teams feels like a Swiss Army knife: more tools in one place, but each blade a little less sharp. If your day is chat, threads, and quick app integrations, Slack is calmer. If your day is Outlook, Word, and scheduled video meetings, Teams keeps it under one roof. We have seen both work; the mismatch happens when a Microsoft-heavy team forces Slack, or a scrappy startup forces Teams.
◢Slack vs Teams pricing: what you actually pay in 2026
Teams is cheaper for almost anyone already in the Microsoft world, because it comes bundled with Microsoft 365. Slack charges per user on top of whatever else you run. The standalone Teams Essentials plan is $4 per user a month, while Slack Pro starts at $7.25 per user a month on annual billing.
Here is the clean version, verified against the official pages.
| Plan tier | Slack | Microsoft Teams |
|---|---|---|
| Free | Unlimited users, last 90 days of history, 10 app integrations, 5 GB storage (Slack) | Group chat, calls, full history, 5 GB per user, no 90-day cap |
| Entry paid | Pro: $7.25/user/mo annual, $8.75 monthly (Slack) | Teams Essentials: $4/user/mo, 300 participants, 10 GB storage (Microsoft) |
| Bundled tier | n/a (chat only) | Microsoft 365 Business Basic: ~$6/user/mo, Teams + Office web + Exchange email + 1 TB OneDrive (Microsoft) |
| Mid tier | Business+: $15/user/mo annual, $18 monthly (Slack) | Bundled into M365 Business Standard / Premium |
| Best for | Integrations, dev teams, non-Microsoft shops | Microsoft 365 users, video-heavy teams, budget |
Two numbers do the heavy lifting. If you pay roughly $6 per user a month for Microsoft 365 Business Basic, Teams is already inside that price (Microsoft). Adding Slack Pro means paying $7.25 per user a month again for a tool you do not strictly need. One heads-up: Microsoft is raising several Microsoft 365 Business prices from July 1, 2026, with Business Basic rising toward $7 per user a month (Office Watch). Even after that hike, the bundle math still favors Teams for Microsoft shops. To see your real spend across both, run our stack cost calculator before you commit.
◢Where Slack genuinely wins
Slack wins on developer experience, integrations, and the small daily details that add up. Its app directory is deeper and the connectors usually just work. Search is faster, threads are cleaner, and the whole thing feels designed by people who use chat all day.
The integration gap is the big one. Slack's free plan caps you at 10 apps, but paid plans open thousands of connectors to tools like Google Drive, Asana, Jira, and Zoom (CompareTiers). For engineering and ops teams that wire alerts, deploys, and tickets straight into channels, Slack is the better canvas. We have run incident channels on both; Slack's bots and workflows felt sturdier.
Slack also plays nicely outside the Microsoft fortress. If you run Google Workspace or any non-Microsoft stack, Slack does not punish you for it. It connects to your Salesforce CRM, your Jira board, your Asana projects, and your Stripe events without dragging you toward one vendor's suite. That neutrality is worth real money if you value not being locked in. For founders building a clean toolset from scratch, this matters more than the headline price.
◢Where Teams genuinely wins
Teams wins on price, on bundled video, and on tight Microsoft 365 integration. If your company lives in Outlook, Word, Excel, and SharePoint, Teams stitches all of it together without a second subscription or a second login.
Video is the quiet strength. Even Teams Essentials handles up to 300 participants with no meeting time limits, and the bundled Microsoft 365 plans add recording, transcription, and breakout rooms (Microsoft). Slack does calls, but most heavy-meeting teams pair it with Zoom, which is yet another bill. Teams folds the meeting tool into the chat tool, and that consolidation is exactly the kind of move we like.
The free plan is also more generous in one key way: no 90-day history wall. Teams free keeps your chat around, while Slack free quietly hides anything older than 90 days and deletes data past a year (Slack). For a bootstrapped team that cannot pay yet, that lost history is a real tax. Teams also rides Microsoft's scale, with revenue and adoption that keep climbing year over year (Business of Apps). When you are picking your early ops stack, "already paid for and never deletes my messages" is a strong argument.
◢The Cut The SaaS angle: stop paying for both
The most common mistake we see is not picking the wrong tool. It is paying for both. A team buys Microsoft 365, gets Teams for free, then signs up for Slack because a few people prefer it, and now there are two chat apps, two sets of channels, and conversations split down the middle.
That split is worse than either tool alone. People miss messages, search twice, and onboard new hires into a maze. Before you debate features, audit what you already pay for. Our SaaS sprawl audit walks through finding these duplicate tools, and our cut SaaS costs guide shows how to kill them without a riot. The right answer is almost always one chat hub, chosen on purpose, with the duplicate cancelled this week.
If you are setting up a new team, fold the decision into onboarding so nobody has a reason to spin up a shadow workspace. One hub, one source of truth, one bill. That is the whole game.
◢Pick Slack if... pick Teams if...
Pick Slack if integrations and developer experience top your list, if you run a non-Microsoft stack, or if your team simply works better in a fast, focused chat app. Slack is the better daily tool and worth its premium when chat is the heart of how you operate.
Pick Teams if you already pay for Microsoft 365, if video meetings are a big part of your week, or if budget is tight and "free with no history limit" beats "nicer but extra." For most Microsoft-shop founders, Teams is the obvious default, and Slack is a luxury you do not need.
The deciding question stays the same: are you already paying Microsoft? If yes, lean Teams and only switch to Slack when the integration pain gets real. If no, lean Slack and enjoy the better experience. Either way, run one tool, not two. To benchmark this against the rest of your tools, our startup tech stack guide puts chat in context with everything else you buy.
◢Conclusion
Slack vs Teams is rarely about features. It is about which vendor already has your money. Teams is bundled, cheap, and great at video, so Microsoft 365 teams should default to it and skip the second app. Slack is the sharper standalone tool, worth paying for when integrations, search, and developer experience drive your day and you live outside the Microsoft world.
The real win is not the tool you pick. It is refusing to pay for both. Audit your stack, choose one chat hub on purpose, and cancel the duplicate before your next renewal. Want more honest, affiliate-free breakdowns like this one? Subscribe to the Cut The SaaS newsletter and we will keep helping you trim the bloat, one tool at a time.
◢FAQ
What is the main difference between Slack and Microsoft Teams? Slack is a best-in-class chat app with deep third-party integrations and fast search, sold on its own. Teams is a bundled hub for chat, video, and files that ships free inside Microsoft 365. Slack wins on developer experience and polish. Teams wins on price and on tight Office, Outlook, and SharePoint integration.
Is Microsoft Teams really cheaper than Slack? Usually, yes. If you already pay for Microsoft 365 Business Basic at about $6 per user a month, Teams costs you nothing extra. Slack Pro starts at $7.25 per user a month on top of whatever else you run. For a team already in the Microsoft world, Teams is effectively free and Slack is a second bill.
Which is better for integrations, Slack or Teams? Slack, clearly. Slack's free plan caps you at 10 apps, but its paid plans unlock thousands of integrations with a smoother setup. Teams has a growing app store and wins hard on native Microsoft 365 tie-ins, but third-party apps often feel clunkier and less reliable than the same connectors on Slack.
How long does Slack keep my message history on the free plan? Only 90 days. Slack's free plan shows the most recent 90 days of messages and files, and anything older than a year gets deleted. Removing that cap means upgrading to Pro at $7.25 per user a month. Teams free keeps your chat history with no 90-day wall, which is a real advantage for budget teams.
Should a startup use Slack or Teams in 2026? If you run Google Workspace or no Microsoft suite, start on Slack for the better experience. If you already pay for Microsoft 365, default to Teams and skip the second tool. The worst move is paying for both. Audit your stack first, pick one chat hub, and put the savings somewhere useful.