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Signal vs imo: catalog facts
Signal	imo
Free Free; developed by a nonprofit funded by grants and donations	Free Free to download and use.
Android, iOS, Windows, macOS, Linux	Windows, macOS, Android, iOS
End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking	Audio and video calls on mobile and desktop Built-in message translation
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 Limited technical detail published about its encryption
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License: Proprietary
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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