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WizTree vs SquirrelDisk: catalog facts
WizTree	SquirrelDisk
Freemium Free for personal use. Commercial use, or removing the Donate button, requires a paid…	Free Free and open source.
Windows	Windows, macOS, Linux, Command line
Reads the NTFS master file table, so scans finish in seconds rather than minutes Treemap view of the whole drive alongside a sorted file and folder list	Sunburst and treemap views Scans remote servers over SSH and cloud storage
Closed source The MFT trick only applies to NTFS; other file systems fall back to a normal scan	Visual charts can be less precise than a plain sorted list
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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