Comparison

Slack vs Mattermost

Overview

Where work happens

Slack is a team messaging platform with channels, direct messages, and a rich app ecosystem used by teams of all sizes for real-time and async workplace communication.

Mattermost

Secure collaboration for technical and operational teams

mattermost.com →

Open-source collaboration platform for secure team messaging, incident coordination, and workflow orchestration in self-hosted or sovereign environments.

Which should you choose?

Slack is a polished, cloud-hosted chat platform from $7.25/month with the largest app ecosystem. Mattermost is built for technical/operational teams needing self-hosted or air-gapped deployment, with incident-response playbooks, at custom pricing beyond its free Entry tier. Choose Slack for the easiest setup and broadest integrations; choose Mattermost if self-hosting, air-gapped security, or incident-response workflows are requirements.

TLDR

—If you want the easiest setup and the broadest app integrations, choose Slack.
—If you need self-hosted or air-gapped deployment with incident-response workflows, choose Mattermost.

Features

—Channels and DMs
—Threads
—Huddles (lightweight audio/video)
—Slack Connect (external collaboration)
—Workflow Builder
—App integrations
—Slack AI
—Canvas docs

—Team messaging and channels
—Playbooks and incident response workflows
—Self-hosted and air-gapped deployment options
—Integrations with developer and IT tools

Pricing

Slack

freemiumFree plan availableSlack offers free trials for Pro or Business+ plans.

Plan	Price	Notes
Free	Free	Free forever with 90 days of message history.
Pro	$7.25/mo	Per user per month billed annually.
Pro	$8.75/mo	Per user per month billed monthly.
Business+	$15/mo	Per user per month billed annually.
Business+	$18/mo	Per user per month billed monthly.
Enterprise+	Contact sales	Contact sales for enterprise pricing.

View pricing page →

Mattermost

freemiumFree plan availableMattermost Entry is the free limited-use edition; paid plans are sold as prepaid annual seat subscriptions through sales.

Plan	Price	Notes
Entry	Free	Free limited-use edition for technical evaluation and smaller teams.
Professional	Contact sales	Paid annual seat subscription; public page directs buyers to contact sales.
Enterprise	Contact sales	Paid annual seat subscription with advanced security and scale features; contact sales.

View pricing page →