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Jami vs Threema: catalog facts
Jami	Threema
Free Free software under the GPLv3 or later. A GNU project with no paid tier.	Paid A one-time purchase is required. Business plans are separate.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, iOS, Web
Completely peer to peer, with no server relaying data between users No phone number or email needed to create an account	No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland
Peer-to-peer delivery means messages to an offline device wait until it reconnects Connection reliability varies more than with a server-relayed service	A one-time purchase is required for each platform Smaller user base than the mainstream encrypted messengers
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
No account needed	Not stated if an account is 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 22, 2026

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