Mattermost Team Edition

Open-source alternative · mapped from 2 paid tools. Fit is not feature parity.

Facts

License

GNU Affero General Public License v3.0 Permissions of this strongest copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Copyright and license notices must be preserved. Contributors provide an express grant of patent rights. When a modified version is used to provide a service over a network, the complete source code of the modified version must be made available. May Commercial useModificationDistributionPatent usePrivate use Must License and copyright noticeState changesDisclose sourceNetwork use is distributionSame license No LiabilityWarranty Summary from GitHub's choosealicense.com

Apache License 2.0 A permissive license whose main conditions require preservation of copyright and license notices. Contributors provide an express grant of patent rights. Licensed works, modifications, and larger works may be distributed under different terms and without source code. May Commercial useModificationDistributionPatent usePrivate use Must License and copyright noticeState changes No Trademark useLiabilityWarranty Summary from GitHub's choosealicense.com

Paid-feature tier C

Self-host

Paid-feature limits2 noted

Group calling and guest accounts excluded from Team Edition.
SSO removed from Team Edition; advanced identity, permissions, compliance and HA in proprietary editions.

Tier C: Core source AGPLv3; designated webapp/admin/config folders Apache-2.0; vendor-compiled Team binary MIT. Enterprise code separately commercial. Tier C because everyday group calls/guests are gated. Proprietary Entry free mode is separate; its 10,000-message cap does not apply to Team. Vendor positions Team below 250 activated users. License source. Repository: mattermost/mattermost. Self-host: server; hosted offer from the project: yes.

Replaces 2 paid tools

Microsoft TeamsEntry price USD 4 / seat / month

Fit:

Partial replacement for persistent channels/DMs. Team lacks group calls and SSO; no verified Teams history importer; meetings and Office-file workflows need separate replacements.

Sources: docs.mattermost.com · checked 2026-10-21
Full comparison: Microsoft Teams vs Mattermost Team Edition
SlackEntry price USD 7.25 / seat / month

Fit:

Team offers channels, DMs and core search, but no group calls or guest accounts. Current Slack migration guide targets Entry/paid editions; Team import parity requires verification; integrations must be rebuilt.

Sources: docs.mattermost.com, docs.mattermost.com · checked 2026-10-21
Full comparison: Slack vs Mattermost Team Edition

Selected by OSSHunt

Mattermost Team Edition is listed as an open-source alternative to Microsoft Teams and Slack, with partial fit or better. Maintainers can show this in a README; the badge links back to this page.

Markdown

[![OSSHunt: replaces Microsoft Teams · Slack](https://osshunt.com/badge/mattermost.svg)](https://osshunt.com/alternatives/mattermost/)

HTML

<a href="https://osshunt.com/alternatives/mattermost/"><img src="https://osshunt.com/badge/mattermost.svg" alt="OSSHunt: replaces Microsoft Teams · Slack"></a>

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   :alt: OSSHunt: replaces Microsoft Teams · Slack

Shields users: https://img.shields.io/endpoint?url=https%3A%2F%2Fosshunt.com%2Fbadge%2Fmattermost.json. Styles: add ?style=flat-square, plastic or for-the-badge. What the badge means and how to remove it.