Freeing up space · Temporary files and Storage Studio's own footprint
Why is my Mac's disk filling up when I haven't saved anything new?
Short answer: Usually an app is writing into your Mac's hidden temporary or cache areas. Storage Studio measures those areas, names the app responsible, and offers to clear what's safe.
Very often it's an app writing into the temporary or cache areas your Mac keeps — places nothing shows you and nobody thinks to look. An app that keeps leaving folders behind there can quietly take a very large share of your disk.
Storage Studio measures both areas, works out which app put what there, and offers to clear it — so the answer becomes a name and a number. When one app accounts for a large share, a banner at the top says so.
It also watches for sudden drops in free space and tells you which app it went to when it can. See which app is filling my disk.