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Zulip vs Trillian: catalog facts
Zulip	Trillian
Freemium The server and clients are free and open source and can be self-hosted at no cost. Zulip…	Freemium Free for individuals, with paid plans for businesses and healthcare.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, iOS
Topic-based threading inside channels, which makes catching up genuinely practical Self-hostable, or hosted, with free plans for open-source communities	Apps for all major desktop and mobile platforms HIPAA-compliant plans for healthcare use
The topic model takes getting used to and needs team discipline to work The desktop client shares most of its code with the web app, so it inherits its quirks	Proprietary and closed source Business and healthcare features require a paid plan
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.