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Ferdium vs Karere: catalog facts
Ferdium	Karere
Free Free and open source under Apache 2.0. Unlike Franz, the project states it does not…	Free Free and open source under the GPL version 3 or later.
Windows, macOS, Linux	Linux
Hundreds of services supported, with workspaces to group them No paid account or usage restrictions, unlike the Franz it forked from	Several WhatsApp accounts in isolated sessions Native GTK4 window instead of a browser tab
Each service is a web view, so memory use grows quickly with many services Service integrations break when a provider changes its web app	Unofficial client that depends on WhatsApp Web Requires a WhatsApp account
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
No 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

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