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3CX Free Basic vs Quo: catalog facts
3CX Free Basic	Quo
Freemium Free for up to 10 users and 4 simultaneous calls; larger editions are paid.	Paid Paid subscription with a free trial.
Self-hosted	Windows, macOS, Android, iOS, Web
No licence cost for small teams Runs on your own infrastructure	Shared numbers and inbox for a whole team Apps on mobile, desktop and web
Limited to 10 users and 4 simultaneous calls Proprietary software	Requires a paid subscription after the trial Aimed at businesses rather than personal use
Self-hosted	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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