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Head-to-head · Team Chat Apps

Mattermost vs Flock

Updated Oct 2026
Both researched from official sources
3 checks side by side

Higher score Mattermost #4 in Team Chat Apps 8.9/10 Free plan Free plan✓ 2 of 2 features Visit Mattermost

Flock #8 in Team Chat Apps 8.5/10 Free plan · 30-day trial Free planFree trial✓ 2 of 2 features Visit Flock

Mattermost leads on 0 checks, Flock on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

Highest scoreMattermost · 8.9/10
Free planboth
Free trialonly Flock

Mattermost scores higher on our rubric for team chat apps: 8.9 against 8.5 out of 10; our editors rank them #4 and #8.

On message history, Mattermost gives you Unlimited where Flock offers Limited.

Mattermost is the better fit for self-hosted technical teams. Flock is the better fit for teams wanting free chat plus work tools.

Mattermost fits best
Self-hosted technical teams
Flock fits best
Teams wanting free chat plus work tools

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Side by side

Show only differences

Feature	Mattermost 8.9/10 Visit ↗	Flock 8.5/10 Visit ↗
At a glance
Editor score	8.9	8.5
Ranking	#4 in Team Chat Apps	#8 in Team Chat Apps
Best for	Self-hosted technical teams	Teams wanting free chat plus work tools
Pricing model	Free plan + paid	Free plan + paid
Starting price	—	—
Free plan	✓	✓
Free trial	—	30 days
Deployment	Cloud, Self-hosted, Desktop, Mobile	Cloud, Mobile, Browser extension
Platforms	Web, Windows, macOS, Linux, iOS, Android	Web, Windows, macOS, Linux, iOS, Android, Chrome extension
Support	Email, Tickets, Community, Docs	Email, Live chat, Docs · 24/7
Compliance	ISO 27001, GDPR	SOC 2, SSO/SAML, 2FA
Integrations	700+ integrations	60+ integrations
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Mattermost 2/2 · Flock 2/2
Channels	✓	✓
Guest access	✓	✓
Specs
Message history	Unlimited	Limited
Integrations	GitHub, GitLab, Jira, Microsoft Teams, Microsoft 365, Outlook, ServiceNow, Zoom, Pexip, Splunk, Zapier	Google Drive, Google Calendar, GitHub, Trello, Dropbox, Twitter, Bitbucket, Asana, Jira, Zapier, Zoom, Microsoft Dynamics 365, Todoist, GitLab, Zendesk, Freshdesk, OneDrive, Mailchimp
Supported platforms	web, Windows, macOS, Linux, iOS, Android, API, self-hosted	web, Windows, macOS, Linux, iOS, Android, Chrome extension, API
Maximum members	Not checked yet	Not checked yet
Our review
Pros	Self-hosting supports on-premises, private-cloud, and air-gapped deployments Combines messaging, calls, boards, automation, APIs, and AI agents Integrates with GitLab, GitHub, Jira, Jenkins, and Microsoft Teams	Free Starter plan includes channels, calls, search, files, and task tools Works across web, desktop, mobile, and Chrome extension Integrates with Trello, Asana, GitHub, Drive, Jira, and more
Cons	Entry limits message history to 10,000 messages Paid Professional and Enterprise plans require sales contact Advanced capabilities are concentrated in higher-tier plans	Starter limits searchable history to 10,000 messages Starter includes 10 public channels and 5 GB per team Guests are charged at the member rate after 90 days
Our verdict	Mattermost is an open-source collaboration platform for technical, operational, defense, and critical-infrastructure teams. It brings public and private channels, direct and group messaging, file sharing, threaded discussions, search,… Read the review →	Flock combines direct messaging, group conversations, public and private channels, guest access, calling, file sharing, and searchable workspace content in one team communication application. It is aimed at organizations that want chat… Read the review →

MattermostTeam Chat Apps 8.9Free plan
FlockTeam Chat Apps 8.5Free plan · 30-day trial

Compare the top tools in

Strengths and trade-offs

Mattermost — where it wins
- Self-hosting supports on-premises, private-cloud, and air-gapped deployments
- Combines messaging, calls, boards, automation, APIs, and AI agents
- Integrates with GitLab, GitHub, Jira, Jenkins, and Microsoft Teams
Where it doesn't
- Entry limits message history to 10,000 messages
- Paid Professional and Enterprise plans require sales contact
- Advanced capabilities are concentrated in higher-tier plans
Flock — where it wins
- Free Starter plan includes channels, calls, search, files, and task tools
- Works across web, desktop, mobile, and Chrome extension
- Integrates with Trello, Asana, GitHub, Drive, Jira, and more
Where it doesn't
- Starter limits searchable history to 10,000 messages
- Starter includes 10 public channels and 5 GB per team
- Guests are charged at the member rate after 90 days

Mattermost8.9/10 · Free plan
A flexible team chat platform for technical teams that need self-hosting and automation.
Visit Mattermost Full verdict →
Flock8.5/10 · Free plan · 30-day trial
A broad team chat workspace with a capable free Starter plan and useful work tools.
Visit Flock Full verdict →

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated 10 Oct 2026 · How we research and update