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

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