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Supremo vs UltraViewer: catalog facts
Supremo	UltraViewer
Freemium Free for non-professional, occasional use; subscriptions are needed for business use.	Freemium Free to use, with paid licences available to order.
Windows, macOS, Android, iOS	Windows
Small executable that needs no router or firewall setup Free for personal, occasional use	Simple to set up for one-off support sessions Built-in chat and file transfer
No Linux client Professional use requires a subscription	Windows only Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 September 24, 2026

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