When comparing WhatSizeMac vs "First Aid Utilities - Clean & Fix", the Slant community recommends WhatSizeMac for most people. In the question“What are the best disk space analyzers for Mac OS X?” WhatSizeMac is ranked 9th while "First Aid Utilities - Clean & Fix" is ranked 10th. The most important reason people chose WhatSizeMac is:
WhatSizeMac is able to listen for file system events and update itself in real time. So it never needs a full volume measure but once in a very while.
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Pros
Pro Updates information in real-time
WhatSizeMac is able to listen for file system events and update itself in real time. So it never needs a full volume measure but once in a very while.
Pro Zip repair
Can repair broken Zip archives.
Pro Extremely fast
Self-explaining, removing clutter and duplicates is extremely fast.
Pro Graphic overview
Graphic overview of a disk shows detailed information about the content.
Cons
Con Poor tech support
No update for Mojave.
Con Commercial
WhatSizeMac cost $29.99 and there is a free trail available.
Con Commercial
One time fee on purchase, though no recurring costs.