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UltraDefrag vs O&O Defrag: catalog facts
UltraDefrag	O&O Defrag
Paid Current versions are sold to registered users.	Paid Commercial software sold by O&O Software.
Windows	Windows
Portable edition available Defragments individual files and folders	Optimizes drives automatically in the background Maintained by an established Windows software vendor
Windows only Current versions are commercial	Windows only Paid software
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.