Top Free Alternatives to Slack
Stop paying expensive subscriptions for Team Communication tools. Discover the best free and open-source replacements for Slack.
Why switch from Slack?
Slack's pricing scales linearly with your team size, making it astronomically expensive for large communities. Open-source alternatives offer unlimited messages and integrations without the per-user tax.
Mattermost
Free / Enterprise Paid
Open-source, self-hostable Slack alternative designed for privacy-conscious enterprises.
Key Features
- Enterprise-grade security
- Custom integrations
- File sharing
- Voice/Video integrations
Pros
- + Looks and feels very similar to Slack
- + Complete control over data
- + Great for DevOps teams
Cons
- - Setup requires some technical knowledge
- - Some advanced features are locked behind Enterprise tier
Zulip
Free / Cloud Paid
An open-source team chat app with an organized threading model.
Key Features
- Topic-based threading
- Markdown support
- Read receipts
- Powerful search
Pros
- + Best-in-class conversation threading
- + Extremely fast
- + Can handle thousands of users easily
Cons
- - UI is a bit dated compared to Slack
- - Learning curve for the threading model
Rocket.Chat
Free / Enterprise Paid
The open-source communication hub that puts privacy and collaboration first.
Key Features
- Omnichannel messaging
- Video/Voice calls
- Matrix federation support
- Custom apps store
Pros
- + Huge selection of integrations
- + Supports full white-label branding
- + Active enterprise backing
Cons
- - Setup of push notifications requires paid subscription or custom builds
- - Can be resource-intensive
Element
Free / Open Source
Enterprise communication platform
Key Features
- 100% data control
- Self-hostable
- No vendor lock-in
- Community-driven
Pros
- + Ownership of your data
- + Flexible and customisable
- + Cost-effective
Cons
- - Requires server setup
- - Smaller commercial support