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

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