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0xchat vs Threema: catalog facts
0xchat	Threema
Free The homepage does not list any price or paid tier.	Paid A one-time purchase is required. Business plans are separate.
Android, iOS	Windows, macOS, Linux, Android, iOS, Web
No phone number or email address needed, only a Nostr private key End-to-end encrypted direct messages and private groups	No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland
Losing the private key means losing the identity Contacts need a Nostr client to reach you	A one-time purchase is required for each platform Smaller user base than the mainstream encrypted messengers
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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