Mattermost Team Edition replaces 4 paid apps
One open-source tool, 4 subscriptions it can stand in for. Each pairing below is curated and verified by hand, with the honest catch spelled out. No votes, no pay-to-list.
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.
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
Mattermost without the invoice: full team chat below 250 users, but no SSO and every server problem belongs to you.
the catchTeam Edition keeps the core chat product, but Professional features such as enterprise authentication, advanced compliance and administration, support, and larger-scale assurances are absent.
the verdict →all Mattermost Professional alternatives →
Slack-shaped chat below 250 users, self-hosted; the subscription disappears and the pager appears.
the catchMattermost Team Edition closely resembles Slack, but self-hosting adds database, email, storage, backup, upgrade, and uptime work while enterprise identity and compliance remain paid.
the verdict →all Slack Pro alternatives →
Channels and threads work, but Mattermost still rewards live chat more than Twist's deliberate silence.
the catchMattermost remains live-chat-first rather than deliberately async, and the current free edition's message-history visibility limit weakens it as a long-term searchable archive.
the verdict →all Twist alternatives →
Full self-hosted team chat for under 250 users; free software, non-free evenings.
the catchMattermost Team Edition is a fuller self-hosted chat, but PostgreSQL, TLS, SMTP, storage, backups, upgrades, and uptime become the team's responsibility.
the verdict →all Pumble alternatives →last updated 2026-08-10 · up to $360/yr replaced · no votes, no pay-to-list
