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UltraDefrag vs Smart Defrag: catalog facts
UltraDefrag	Smart Defrag
Paid Current versions are sold to registered users.	Free Offered by IObit as a free download.
Windows	Windows
Portable edition available Defragments individual files and folders	Defragments hard drives and optimizes SSDs Targets boot time as well as general disk layout
Windows only Current versions are commercial	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
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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