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SimpleX Chat vs Threema: catalog facts
SimpleX Chat	Threema
Free Free and open source under the AGPL 3.0. The company is funded by investment and…	Paid A one-time purchase is required. Business plans are separate.
Windows, macOS, Linux, Android, iOS, Command line	Windows, macOS, Linux, Android, iOS, Web
No user identifier of any kind, so conversations cannot be correlated by account Double ratchet encryption with an additional layer for the relay servers	No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland
Connecting means exchanging a link or QR code in person or elsewhere No contact list means a lost device is a lost set of conversations unless backed up	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: AGPL-3.0	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	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.