Best Slack Alternatives
Discover open-source, self-hosted alternatives to Slack. Save money, own your data, and break free from vendor lock-in.
Why Switch from Slack?
While Slack is popular, open-source alternatives offer significant advantages in cost, privacy, and control.
Slack Limitations
- Limited message history on free plan (90 days)
- 10 integrations limit on free tier
- Expensive for large teams ($12.50/user/month for Business+)
- Data stored on Slack's servers
- No self-hosting option
Open-Source Benefits
- 100% data ownership and privacy
- Unlimited message history
- No per-user pricing limits
- Save $200-500/month for teams of 20+
- Full control over data location and security
Slack is popular with: Startups, Remote teams, Tech companies, Enterprises20M+ daily active users
21 Open-Source Alternatives to Slack
All alternatives are actively maintained, open-source, and ready to self-host. Compare features, GitHub stars, and deployment difficulty.
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Frequently Asked Questions
Everything you need to know about switching from Slack
What are the best alternatives to Slack?
We've curated 21 high-quality open-source alternatives to Slack. Each alternative offers similar functionality while giving you complete control over your data and infrastructure. Popular choices include tools with Docker support for easy deployment.
How much can I save by switching from Slack?
Depending on your team size and usage, you can save anywhere from $7.25-12.50/user/month (paid plans) per month on subscription fees. With self-hosted alternatives, you typically only pay for server hosting (starting at $10-20/month), regardless of the number of users.
Are open-source alternatives as good as Slack?
Many open-source alternatives match or exceed Slack's features. While Slack offers polish and convenience, open-source tools provide greater flexibility, customization, data ownership, and privacy. The best choice depends on your specific needs and technical capabilities.
How difficult is it to self-host an alternative to Slack?
Difficulty varies by tool. Many alternatives offer Docker deployment, making setup possible in under 30 minutes. We rate each tool's self-hosting difficulty on a 1-10 scale. If you're not comfortable self-hosting, many tools also offer managed hosting options from third-party providers.
Can I migrate my data from Slack?
Most open-source alternatives provide migration tools or import functionality for Slack data. The ease of migration depends on the specific tools involved. We recommend reviewing each alternative's documentation for migration guides and best practices.
Do these alternatives work for teams/enterprises?
Yes! Many Slack alternatives are used by teams and enterprises worldwide. They often include features like SSO, RBAC, audit logs, and high availability configurations. Unlike Slack, there are typically no per-user pricing limits.
Ready to Break Free from Slack?
Use our calculator to see how much you could save by switching to open-source alternatives.