Slack vs Zulip
Side-by-side feature comparison and pricing breakdown.
Topic-Based Threading Zulip's unique model organizes every message by topic
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Async-Friendly Design Zulip is built for async; Slack favors real-time
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Full Message History Slack free limits to 90 days; Zulip has full history
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Self-Hosting Zulip is open-source and self-hostable
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Search Quality Both have strong full-text search
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Third-Party Integrations Slack has more integrations; Zulip has 100+ webhooks
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Learning Curve Slack is more intuitive; Zulip's topic model takes adjustment
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Pricing
$8.75/mo
Free Open Source
Save 100% — Save $8.75/user/mo by self-hosting (100% savings)
Verdict
Zulip's unique topic-based threading model is a game-changer for async teams where conversations get lost in Slack's channel noise. Slack is better for real-time, casual chat, but Zulip keeps complex discussions organized.
Best for: Remote and async-first teams that need organized, topic-threaded conversations
Last updated: 2026-03-01