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VoIP.ms SMS vs Quo: catalog facts
VoIP.ms SMS	Quo
Free The app is free and open source; a VoIP.ms account and number are paid separately.	Paid Paid subscription with a free trial.
Android	Windows, macOS, Android, iOS, Web
Familiar interface modelled on Google's SMS app Syncs with device contacts	Shared numbers and inbox for a whole team Apps on mobile, desktop and web
Only works with VoIP.ms numbers Push notifications only in the Google Play version	Requires a paid subscription after the trial Aimed at businesses rather than personal use
Downloadable app	Downloadable app, Web application, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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