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Avast Cleanup vs System Mechanic: catalog facts
Avast Cleanup	System Mechanic
Paid Paid product with a free trial.	Paid Paid license, listed at $54.95 and often discounted.
Windows	Windows
Junk file removal and registry cleaning in one tool Targets slow boot times	Combines junk cleanup, startup management and privacy wiping Automated maintenance through ActiveCare
Paid after the trial Registry cleaning brings little measurable benefit on modern Windows	Windows only Closed source and paid
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
Not stated if it works offline	Not stated if it 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.