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Signal vs Trillian: catalog facts
Signal	Trillian
Free Free; developed by a nonprofit funded by grants and donations	Freemium Free for individuals, with paid plans for businesses and healthcare.
Android, iOS, Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking	Apps for all major desktop and mobile platforms HIPAA-compliant plans for healthcare use
Requires a phone number that can receive an SMS or phone call to register Desktop app requires Signal to be installed on a phone first	Proprietary and closed source Business and healthcare features require a paid plan
Downloadable app	Downloadable app, Hosted service
Open source	Closed source
License: AGPL-3.0	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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