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Zulip vs Pumble: catalog facts
Zulip	Pumble
Freemium The server and clients are free and open source and can be self-hosted at no cost. Zulip…	Freemium Free with unlimited users and message history; paid plans are sold for businesses.
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	Unlimited users and message history on the free offering Channels, threads, calls and recording in one app
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	Hosted service only, with no self-hosting option Closed source
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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