Replacement guide

How do I replace Slack?

4 open source alternatives that can cover different use cases of Slack — each with its real fit, not a "replaces it completely" promise.

Can replace Slack for team channels, threads and video calls, with no message history limit.

Limitation: Needs MongoDB with a replica set in production, which adds operational complexity compared to a single-container deploy.

Can replace Slack for team chat and collaboration, with a focus on security and regulatory compliance.

Limitation: The free Team edition has fewer features than the paid Enterprise one.

Can replace Slack for team chat, organizing each channel into topic threads instead of a single chronological stream.

Limitation: The topic-threading model has a learning curve for teams used to Slack's format.

Can replace Slack for team chat, inside a broader suite that also covers projects and documents.

Limitation: Young project, with a still-limited integration ecosystem.

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