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O&O Defrag vs UltraDefrag: catalog facts
O&O Defrag	UltraDefrag
Paid Commercial software sold by O&O Software.	Paid Current versions are sold to registered users.
Windows	Windows
Optimizes drives automatically in the background Maintained by an established Windows software vendor	Portable edition available Defragments individual files and folders
Windows only Paid software	Windows only Current versions are commercial
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
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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