Compare software

Auslogics Disk Defrag vs Smart Defrag: catalog facts
Auslogics Disk Defrag	Smart Defrag
Free Disk Defrag is free; the separate Disk Defrag Ultimate edition is paid.	Free Offered by IObit as a free download.
Windows	Windows
Free alternative to the built-in Windows defragmenter From a long-running Windows utilities developer	Defragments hard drives and optimizes SSDs Targets boot time as well as general disk layout
Windows only Defragmenting brings little benefit on SSDs	Windows only Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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