Slack vs Teams: Which collaboration hub is right for you in 2025?

Picking between Slack and Teams isn't just about choosing a chat app. It's about deciding where your company's conversations will live, and that’s a pretty big deal. Get it right, and your team clicks. Get it wrong, and you're stuck digging through endless notifications for that one piece of information you know you saw somewhere.

Both platforms are giants in the collaboration space, but they were built for very different kinds of teams, workflows, and company cultures. This guide will cut through the marketing fluff and get into the real differences. We'll look at everything from the daily user experience to how they connect with other tools. By the end, you should have a much clearer picture of which one makes sense for you.

What are Slack and Microsoft Teams?

Before we get into the details, let's cover the basics. Both tools were born from the same idea: save us all from our overflowing email inboxes by creating one central place for team conversations. But they grew up in very different neighborhoods.

Slack

is a messaging platform that was built from the ground up to be flexible and fast. It started in the tech world, and its whole philosophy is about being an open hub. It’s designed to connect with thousands of other apps, so you can plug in the tools your team already knows and uses.

Microsoft Teams

is the all-in-one collaboration tool that lives inside the massive Microsoft 365 world. You can think of it as the central command for everything else you do in Word, Excel, SharePoint, and Outlook. It's built around more formal "Teams" and their sub-channels, aiming to be the single spot for all your work in the Microsoft suite.

The daily user experience

How it feels to use Slack versus Teams every day is where you'll notice the biggest difference, and it usually boils down to company culture. The right fit really depends on how your team actually works.

Slack's customizable and casual interface

Slack’s interface is famously easy to get the hang of and you can tweak just about everything. You can organize your sidebar, choose different color themes, and fine-tune your notifications so you only get pinged for what matters. This makes it feel less like a tool your company forces on you and more like your own personal workspace.

It’s also known for encouraging a more informal and, let's face it, more human way of communicating. The heavy use of emojis and GIFs isn't just for fun; it helps add a bit of personality back into digital conversations. More importantly, Slack is built around "open" channels. Anyone can create a channel for a new project, a shared interest, or a quick problem-solving huddle. This setup makes it super easy for information to flow between departments and for people to organize themselves without needing permission, which is great for breaking down silos.

Microsoft Teams' structured and formal interface

Microsoft Teams looks and feels like a Microsoft product. The interface is clean and professional, and if your team spends all day in Outlook and SharePoint, it will feel instantly familiar.

But its approach is much more rigid. Conversations are organized into channels, but those channels are always stuck inside a specific "Team." This top-down structure keeps things tidy, but it can also make collaboration feel a bit stiff. As one Reddit user pointed out, trying to create a simple, company-wide support channel in Teams is a huge headache because you have to add every single employee to one giant "Team." This kind of structure can get in the way of the spontaneous, cross-team chats that happen so naturally in Slack. Users also often complain that the chat experience feels clunky, with simple actions like copy-pasting text often messing up the formatting.

How they handle integrations

A chat tool is pretty useless if it doesn't play nicely with the other apps you use. And this is where the core philosophies of Slack and Teams really show. One wants to be the friendly hub that connects to everything, while the other wants to be the center of its own universe.

Slack's massive app marketplace

Slack's biggest advantage is its enormous app directory, which features over 2,600 third-party integrations. This makes it the clear winner for companies that pick and choose the best tools for each job. If your team uses Google Workspace, manages projects in Asana, and tracks bugs in Jira, Slack acts as the perfect glue to hold it all together.

You can get notifications, create tasks, and pull reports from your other software without having to leave your chat window. The workflow builder also lets you create simple automations between these tools, which can save a ton of time and clicks.

Microsoft Teams' deep Office 365 connection

The main selling point for Teams is its deep, native integration with the Microsoft 365 suite. It's not just connected; it’s a single, unified system. You can create and edit a Word doc, adjust an Excel spreadsheet, or present a PowerPoint slide deck right from within a Teams channel.

Files are automatically saved in SharePoint and OneDrive, and your Outlook calendar syncs perfectly with your Teams meetings. If your company is already paying for and using the Microsoft ecosystem, this is a huge plus. It simplifies things for IT, bundles costs together, and keeps all your work inside one secure environment.

The shared problem of finding anything

But let's be honest, both of these approaches create a new problem: your company's knowledge ends up all over the place. In Slack, that crucial answer might be in a Confluence doc, a Google Doc, or buried in an old Zendesk ticket. In Teams, it’s tucked away in some corner of the Microsoft suite. Either way, finding one simple answer can turn into a frustrating scavenger hunt.

This is why having a tool that sits on top of all your knowledge is so important. A tool like eesel.ai is built to solve this exact problem. The AI Internal Chat from eesel connects to all your company's scattered knowledge, whether it's in wikis, helpdesks, or shared docs. It then delivers instant, accurate answers right inside Slack or Microsoft Teams. It transforms your chat app from just a place to talk into a place to get real answers, so your team can stop searching and start working.

Eesel provides instant answers from all your company apps, directly within your Slack workspace.

Search and AI for finding what you need

When you're dealing with a never-ending flood of messages, a good search function isn't just nice to have, it's a necessity. Both platforms have added AI features to help, but they work quite differently.

A look at Slack AI vs. Microsoft Copilot

Both platforms offer AI add-ons to improve search and help with productivity.

Slack AI is an add-on that costs $10 per user per month. It's pretty good at summarizing long channels and threads, giving you a daily recap, and answering questions based on conversations that have happened inside Slack. It’s helpful for catching up, but it can only see what’s in your Slack workspace.

Microsoft 365 Copilot is a more ambitious (and more expensive) AI assistant at $30 per user per month. It's woven into the entire Microsoft suite, so it can do things like summarize meetings in Teams, help you write emails in Outlook, and create presentations in PowerPoint. But again, its knowledge is mostly limited to what's already inside the Microsoft ecosystem.

The big drawback for both is that they can't learn from the information you have stored elsewhere. They won't find the answer in your internal wiki on Notion or pull a solution from a solved ticket in Freshdesk.

A smarter way to get answers

This is where a purpose-built tool like eesel.ai really shines. It's designed to bring together all of your company's knowledge, no matter where it's stored. It connects to your support tickets, internal wikis, and shared drives to understand the context of your business and provide answers that are actually useful.

The best part? eesel.ai is designed to be completely self-serve. You can connect your knowledge sources and get going in minutes, no sales call or mandatory demo required. That's a huge departure from the typical enterprise tool that takes weeks to set up. It gives your team powerful AI that understands your business, right away.

Pricing breakdown

Alright, let's talk about the price tag. The way Slack and Teams handle pricing says a lot about what they are. With Slack, you're paying for a top-tier communication tool. With Teams, you're usually getting chat as part of a much bigger software package.

Slack pricing

Slack's plans are pretty direct. You pay more for features like unlimited message history, more integrations, and better security.

Feature	Free	Pro ($8.75/user/mo)	Business+ ($15/user/mo)
Message History	90 days	Unlimited	Unlimited
Integrations	Up to 10	Unlimited	Unlimited
Huddles (Calls)	1:1 only	Up to 50 participants	Up to 50 participants
Slack Connect	1:1 DMs only	Channels with up to 250 orgs	Channels with up to 250 orgs
Security	Standard	OAuth with Google	SAML-based SSO, Data exports

Microsoft Teams pricing

Teams is usually bundled with Microsoft 365 subscriptions, which makes it a fantastic deal if you already need the other apps in the package.

Plan	Price (per user/mo)	Key Features Included
Teams Essentials	$4.00	Teams only, 30-hour meetings, 10GB storage
M365 Business Basic	$6.00	Teams, Web/Mobile Office apps, 1TB storage
M365 Business Standard	$12.50	Everything in Basic + Desktop Office apps

For companies that are all-in on Microsoft, Teams is practically a free bonus with a ton of value. For everyone else, Slack's price reflects what it is: a premium, standalone tool that’s more flexible and often provides a better user experience for communication.

Which one should you choose?

The honest answer to the Slack vs Teams question depends entirely on your team: what tools you already use, how you talk to each other, and what your budget looks like.

Choose Slack if:

Your team values flexibility, loves customizing their tools, and uses a mix of best-in-class software (like Google Workspace, Atlassian, etc.). It’s best for fast-moving, informal environments where open communication is a top priority.

Choose Teams if:

Your company is heavily invested in the Microsoft 365 ecosystem. You want a structured, all-in-one platform that bundles chat, video, file storage, and office apps for one predictable price. It’s a natural fit for larger organizations that prefer a single vendor.

But no matter which platform you go with, the problem of scattered knowledge isn't going away. Don't let your team's hard-earned wisdom get lost in the noise. Give them a single source of truth that meets them where they already work.

This video provides a detailed comparison to help you decide between Slack and Teams for your company's communication needs in 2025.

Give your Slack or Teams a brain with eesel AI and get instant answers from all your company knowledge. You can try it for free today.