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Threema vs SimpleX Chat: catalog facts
Threema	SimpleX Chat
Paid A one-time purchase is required. Business plans are separate.	Free Free and open source under the AGPL 3.0. The company is funded by investment and…
Windows, macOS, Linux, Android, iOS, Web	Windows, macOS, Linux, Android, iOS, Command line
No phone number or email required; the ID is random Apps are open source and the company is based in Switzerland	No user identifier of any kind, so conversations cannot be correlated by account Double ratchet encryption with an additional layer for the relay servers
A one-time purchase is required for each platform Smaller user base than the mainstream encrypted messengers	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
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
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.