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Threema vs Jami: catalog facts
Threema	Jami
Paid A one-time purchase is required. Business plans are separate.	Free Free software under the GPLv3 or later. A GNU project with no paid tier.
Windows, macOS, Linux, Android, iOS, Web	Windows, macOS, Linux, Android
No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland	Completely peer to peer, with no server relaying data between users No phone number or email needed to create an account
A one-time purchase is required for each platform Smaller user base than the mainstream encrypted messengers	Peer-to-peer delivery means messages to an offline device wait until it reconnects Connection reliability varies more than with a server-relayed service
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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