Avast Cleanup Premium 21.4 inherits the theme of Avast’s broader product line. The interface is uncluttered:

Beyond its headline features for this version, Avast Cleanup Premium includes a robust set of tools to address common PC performance issues:

No crashes, no Blue Screens of Death, and no boot failures occurred during two weeks of heavy use across the three test systems.

However, like any software, it has its share of criticisms. Some users have reported issues, such as a clean junk scan getting stuck at 80%, though these seem to be sporadic rather than universal problems. Others have mentioned that the program can send "too many notifications" by default.