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MattermostSlackMicrosoft Teams

	Mattermost	Slack	Microsoft Teams
Rating	4.4(400)	4.5(32,000)	4.3(15,400)
Pricing	Free plan available	Free plan available	Free plan available
Free tier	Yes	Yes	Yes
Free trial	30 days	—	30 days
Best for	IT teams and organisations with strict data control policies	Distributed teams needing real-time chat and integrations	Organisations using Microsoft 365 for productivity
Category	communication	communication	communication
Top features	✓Self-hosted deployment ✓End-to-end message encryption ✓Open source codebase ✓Channel-based team chat	✓Channel-based conversations ✓Direct and group messaging ✓Voice and video Huddles ✓File sharing and search	✓Threaded team chat ✓Voice and video meetings ✓File sharing with permissions ✓Collaboration on Office documents
	Visit Site	Visit Site	Visit Site