Mattermost Professional alternatives: 5 open-source picks
Mattermost Professional costs $10/mo — $120 a year. These 5 alternatives replace it for $0, led by Rocket.Chat Community, Mattermost Team Edition and Zulip. All 5 are open source. License, stars and last commit checked by hand on 2026-08-29. No trials, no crippled tiers.
Channels, threads, search and integrations for up to a hundred concurrent users; MongoDB joins the team.
licenseMIT
runsyour server
installDeploy the Community workspace with Docker Compose, Podman, or Kubernetes
dataUsers, rooms, messages, and most metadata live in MongoDB; uploads live on local storage or a configured object-storage backend.
the catch vs Mattermost ProfessionalRocket.Chat Community provides the expected team-chat surface, but MongoDB and upgrades are yours and the free Community workspace is limited to 100 concurrent users.
setupA production installation requires MongoDB, DNS/TLS, email, backups, upgrades, and enough capacity planning to stay within the Community plan's 100-concurrent-user limit.
facts verified 2026-08-10
Mattermost without the invoice: full team chat below 250 users, but no SSO and every server problem belongs to you.
licenseMIT
runsyour server
installInstall the official Linux binary with PostgreSQL, then configure systemd, TLS/reverse proxy, SMTP, and file storage
dataChannels, posts, users, and configuration live in PostgreSQL; file attachments live in the Mattermost data directory or configured S3-compatible object storage.
the catch vs Mattermost ProfessionalTeam Edition keeps the core chat product, but Professional features such as enterprise authentication, advanced compliance and administration, support, and larger-scale assurances are absent.
setupThe first obstacle is a real Linux service deployment, PostgreSQL, SMTP, DNS/TLS, storage, backups, and upgrades, not an app-store install.
facts verified 2026-08-10
Email-shaped topics inside team chat; excellent for async work and merciless about naming conversations.
Matrix rooms, threads, files and search with free hosted accounts; less Slack clone, more protocol.
licenseAGPL-3.0-or later OR GPL-3.0+
runsyour machine or their cloud
installUse a free Matrix account in Element Web/mobile/desktop, or deploy Element Server Suite on your own infrastructure
dataRooms, event history, account data, and media live on the selected Matrix homeserver; encrypted-room keys remain on clients and can be backed up through Matrix's key-backup system.
the catch vs Mattermost ProfessionalElement covers rooms, threads, files, and search, but its Matrix-first model and smaller workplace-integration surface are less familiar and less Slack-like than Mattermost.
setupThe clean hosted path is easy, but self-hosting the current Element Server Suite means operating a Matrix homeserver and its Kubernetes/Helm-based stack.
facts verified 2026-08-10
The internet's civilized discussion platform — modern forums with trust levels and rich moderation.
licenseGPL-2.0
runsyour server
setupnot verified by us yet — check the repo README
facts verified 2026-08-29
What each one is, in full: Rocket.Chat Community · Mattermost Team Edition · Zulip · Element · Discourse
last updated 2026-08-29 · no votes, no pay-to-list · just what's real
how to choose a Mattermost Professional alternative
Easiest to get running
Element — they host it, so there is nothing to install.
Most proven
Rocket.Chat Community, with 45,900 GitHub stars — the largest community of the 5, which usually means more answers when something breaks.
Works on your phone
Rocket.Chat Community has a mobile app on iOS and Android.
Needs real ops to self-host
Rocket.Chat Community, Mattermost Team Edition and Zulip are capable but expect someone to run a server, updates and backups. Budget for that before choosing one.
what you give up by leaving Mattermost Professional
- managed operations, mobile push, enterprise security, support, and governance
- network effects
- native mobile apps
- video and voice infrastructure
- enterprise moderation and discovery
None of the picks above covers all of it. The full verdict says which gaps matter.
Mattermost Professional alternatives at a glance
| tool | license | running it | platforms | stars | active |
|---|---|---|---|---|---|
| Rocket.Chat Community | MIT | self-host, real ops | web, macos, windows, linux, ios, android, self-hosted | 45,900 | 2026-08 |
| Mattermost Team Edition | MIT | self-host, real ops | web, macos, windows, linux, ios, android, self-hosted | 38,700 | 2026-08 |
| Zulip | open source | self-host, real ops | web, macos, windows, linux, ios, android, self-hosted | 25,600 | 2026-08 |
| Element | AGPL-3.0-or later OR GPL-3.0+ | they host it | web, macos, windows, linux, ios, android, self-hosted | 13,300 | 2026-07 |
| Discourse | GPL-2.0 | docker to self-host | self-hosted, web | 44,000 | 2026-08 |
why people still pay for Mattermost Professional
People still pay for Mattermost Professional because community software is valuable when members are already there and the operator does not have to own realtime reliability and abuse response. The recurring cost buys realtime delivery, notifications, abuse handling, search, media, permissions, mobile clients, backups, and community operations, not just the visible interface. If none of that applies to you, any pick above saves $120 a year.
questions about switching from Mattermost Professional
Is there an open-source alternative to Mattermost Professional?
Yes: Rocket.Chat Community, Mattermost Team Edition, Zulip and 2 more. Every tool on this page is open source: no trials, no crippled tiers.
Can open source really replace Mattermost Professional?
Our verdict is YES. Rocket.Chat Community (46k stars), Discourse (44k stars), Mattermost Team Edition (39k stars) are mature open-source replacements for Mattermost Professional — self-host with real ops work and stop paying $10/mo. The full verdict, and what you give up by switching, is at caniopensourceit.online/mattermost-professional.
What is the easiest open-source Mattermost Professional alternative to set up?
Element — they host it, so there is nothing to install.
What is the most popular open-source Mattermost Professional alternative?
By GitHub stars, Rocket.Chat Community (45,900). Discourse is next with 44,000.
