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Zulip

Threaded team chat that respects deep work

provisional — pending verificationApache-2.0self-hostable

Value Index

4.3 / 5

Transparency5

Value density4

Privacy5

Efficiency3

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Why it's listed

Zulip is listed in team chat & messaging because it competes on utility: threaded team chat that respects deep work. It's built by an independent, bootstrapped team — no growth-at-all-costs pressure, no ad-tax passed to you. Licensed Apache-2.0; pricing: free (ce) / paid cloud. Its resource footprint is reasonable for what it does, though not featherweight. This entry is provisional — the scores are seeded estimates pending our full manual rubric pass, and the verification date will appear here once complete.

Facts

License: Apache-2.0
Pricing: Free (CE) / paid cloud
Funding model: Bootstrapped OSS company
Self-hostable: Yes — deploy difficulty: medium
Replaces: Slack
Verification: Provisional — scores are seeded estimates pending manual verification

Evidence notes

100% FOSS server, free cloud for OSS orgs

Also in team chat & messaging

Matrix Synapse / Element (3.8) — Federated, E2E-encrypted messaging
Mattermost (3.5) — Slack alternative you control
Rocket.Chat (3.0) — Feature-rich team chat

Spotted a problem — trackers added, dark patterns, abandonment? Report a violation. Scores change when evidence does.