Slack vs Microsoft Teams, Google Chat and WhatsApp: Which Fits How Your Team Works?

The short version

All four tools let people message each other. The real difference is what each one is built around. Slack is built around channels that connect people, apps and outside partners. Microsoft Teams is built around Microsoft 365 and meetings. Google Chat is built around Google Workspace. WhatsApp is built for personal messaging, and many teams use it for work simply because everyone already has it.

There is no single winner for every business. The right choice depends on the tools you already pay for, how much you work with people outside the company, and how much of your customer work runs through a CRM like Salesforce.

Side by side

Here is how the four compare on the things that matter most to business teams.

Scroll sideways on a phone to see all four. Feature details are as published by each vendor at the time of writing and change often.

Where Slack stands out

Slack is at its best when work spans many teams, apps and companies.

• Channels for everything. A channel per project, client, deal or incident keeps conversations searchable and out of private inboxes.
• Slack Connect. Shared channels with clients and partners replace long email chains, with each company keeping control of its own side.
• Workflow Builder. Teams can automate requests, approvals and hand-offs without writing code.
• Apps where you work. Slack says it integrates with over 2,600 apps, so alerts and actions from other systems arrive in the channel.
• Salesforce and Agentforce. Salesforce owns Slack, so CRM records, deal rooms and AI agents work inside conversations rather than beside them.

Where the others make sense

Microsoft Teams is a sensible default for organisations deeply invested in Microsoft 365. Calendaring with Outlook and scheduled meetings with large audiences are real strengths, which even Slack acknowledges. Many Microsoft 365 plans already include Teams, so the cost question often comes down to licences you already hold.

Google Chat suits companies that run on Gmail, Drive and Docs and want chat that sits naturally beside them, without adding another vendor.

WhatsApp groups are fast and familiar, which is why they spread. The catch is control: messages live on personal phones, history leaves when people do, and customer details end up in chats the company cannot see or manage. Under Malaysia's Personal Data Protection Act, that is a risk worth taking seriously. We cover it in our guide to customer data privacy.

You do not have to rip and replace

Choosing Slack does not mean abandoning Microsoft 365 or Google Workspace. Slack connects to Outlook, Google Calendar, OneDrive and Google Drive, and can start Teams or Zoom calls from a channel. Many of our clients run Slack for day-to-day collaboration while keeping email and documents where they are.

Watch: Slack in action

Official demos from Slack, opening on slack.com.

Some Slack demos ask for your details before playing. For more, visit Slack on YouTube, or try our interactive Slack and Salesforce demo.

How to decide: five questions

Before comparing price lists, answer these honestly.

• Where does your team already live? If everyone works in Outlook and SharePoint all day, Teams is the path of least resistance. If work runs across Salesforce and many other apps, Slack connects them better.
• How much do you work with people outside the company? Clients, agencies and partners in shared channels is where Slack Connect shines.
• Is customer data being shared in personal chats? If WhatsApp groups are carrying customer details, that is a data protection problem before it is a tooling one.
• Do you want automation without developers? Compare Workflow Builder with Power Automate on a real process, such as approvals or leave requests.
• Is your CRM part of the conversation? If sales and service run on Salesforce, Slack is where deals and cases can be discussed and updated in one place.