Free Slack alternatives in 2026
Slack Pro is excellent for large orgs already deep in its integrations — and expensive once you multiply seats. For startups, open-source teams, and communities, free self-hosted and freemium chat often covers channels, history, and integrations without a monthly bill per person. CheaperThan ranks free-first options by workflow match + price.
Quick picks
- Mattermost — open-source Slack-style team chat; self-host free for unlimited history when you want control of data.
- Rocket.Chat — free self-hosted messaging with channels, threads, and omnichannel options.
- Discord Free — free community and team chat with voice, video, and persistent channels (different culture, strong free tier).
- Zulip — free/open-source chat organized around topics — great when Slack-style channel noise is the problem.
Live ranking: cheaper than Slack · Slack vs Mattermost · Slack vs Rocket.Chat. Also browse free tools in best free meeting & chat.
Self-host vs freemium cloud
Self-hosting (Mattermost, Rocket.Chat, Zulip) means ops work but no per-seat Pro tax and full history under your roof. Discord Free and similar freemium products trade host control for zero server setup. Pick based on compliance and who will run the stack — not marketing slogans.
How we rank
We do not invent star ratings. Alternatives are ordered by match score and price, with free options called out. Prices are labeled estimated or verified. Read methodology.
Updated 2026-07-31. Free tiers and fair-use limits change — check vendors before you migrate a whole org.