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Microsoft Teams vs Slack

In analysis / By Charlotte Tobulevicius / 28 February 2020

Slack and Microsoft Teams are the leading collaboration applications for businesses today. Both have been designed to bring teams together - both in-house and remote workers - to boost productivity no matter where they are in the world. Slack was the ruler of this space for a long time, however, Microsoft has been making changes to Teams to place it firmly against the market leader, by targeting small businesses and making it similar to Slack in function and design.

While both softwares look similar, making differences difficult to spot, there is a lot in both services that sets them apart. We take a look at how Slack and Teams differ to see which one is best for you.


Teams and Slack offer very similar conversational functions that include tagging and plain text. You can send fun GIFs to your colleagues, though Teams makes it easier to convey messages. Slack requires you to enter a command such as “/giphy” to place a GIF into the thread.

Teams has a toolbar at the bottom that includes access to a GIFs and stickers library. You can even click the Stickers to create your own customised meme. Slack gives you the option to integrate with Bitmoji and similar services, but it’s not as easy to use as Teams.

As for customising the message interface, Slack offers great variety. Slack has light and dark themes for users to choose from. There are also options to switch colours between 10 different options including Dagobah and Nocturne that complement the theme.

Microsoft Teams allows you to swap between three generic themes (light, dark and high contrast) but lacks multiple customisation options.


Previously, only Slack offered a freemium model that appealed to small businesses on tight budgets. Recently, however, Microsoft Teams now offer this model also.

Slack provides users with unlimited public and private channels, file sharing, 5GB storage and integrations with 10 apps. The free plan restricts your searchable history to 10,000 entries.

Microsoft Teams allows users unlimited messages, access for guests, screen share, integration apps with over 140 apps and services, and 2GB of storage for each individual. However, you can only have up to 300 registered users.

Slack’s standard package costs £5.17 per person per month when billed yearly. This adds unlimited apps, increases storage to 10GB for each member, activates screen sharing and guest access. The entire message history is also saved. The Plus plan charges £9.68 per person each month when billed annually with an increase in storage of 20GB for each user. Large businesses can enquire with Slack about an Enterprise plan.

Microsoft Teams keeps it simple with two premium plans. The first plan is £3.87 per user per month when billed annually. Office 365 Business Essentials retains the 300-user limit, but storage for each user is increased to 10GB. You also get OneDrive integration, Exchange email, meeting recordings, support from Microsoft and more with this plan.

The Office 365 Business Premium Package takes things further by removing user and storage limits but adds more features including multi-factor authentication. This plan costs £15.49 per user per month as part of an annual bill.

Integrated Apps

Slack’s free version limits integrations with just 10 apps. With a paid plan, you can integrate Slack with more than 800 apps. You’ll likely find that your productivity app is compatible with Slack.

Microsoft Teams has an approach to app integration which greatly benefits businesses. The software offers unlimited integrations with other apps, but it only works with around 180 apps. However, Teams is fully integrated with Office 365, making it the perfect platform if you use the Microsoft Suite.

Web Conferencing

Slack offers unlimited 1-to-1 voice or video calls in its free package. To add more callers into one conference call, you need a paid plan which supports 15 callers.

It’s no surprise that Microsoft has excellent web conferencing capabilities, considering it has owned Skype since 2011. On every tier, including the freemium package, you can voice or video call with up to 250 people at once. Teams also gives you the option to record meetings (not available in Slack) and screen share (only in Slack’s higher tier packages). Any company that is team-focused or is a large business where conferencing is common, Teams is the perfect platform.

Help Services

Both platforms use bots to help users. Slackbot is a great place for saving links, experimenting with new integrations and asking general questions. You can message Slackbot a question privately and it searches the Help Center to find three related articles.

You don’t get bots in the freemium version of Teams, but you get WhoBot in premium models. The graph AI included is used to gather information about teams and employees including their specialities, managers, departments and more. WhoBot is great for answering general questions in regards to employee recommendations for people needing help or putting together teams.


Both Microsoft Teams and Slack are available on:

  • Windows - 32-bit and 64-bit
  • MacOS
  • Linux - 32-bit and 64-bit
  • Android
  • iOS

Microsoft Teams isn’t native to Windows currently, instead offered as a desktop client and both Slack and Microsoft Teams can be used in any modern web browser.

Slack and Microsoft Teams are each superb chat applications that will boost collaboration and productivity between teams. However, the extra features of Microsoft Teams including its limitless conferencing call options and its integration with Office 365 make it a must for businesses.

Nasstar can help you migrate, manage and support your Office 365 workspace. We’ll be with you every step of the way as we migrate your emails, files and data into the secure Microsoft O365 cloud. We’ll get you started with apps such as Teams to get your team communicating and collaborating in no time.

Contact Nasstar today to get started.

Charlotte Tobulevicius

Charlotte Tobulevicius

Charlotte Tobulevicius is a Marketing Executive at Nasstar and has over four years experience writing content for a variety of clients in a number of verticals.

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