iCloud & iCloud Photos · iCloud storage space and plans
Does Storage Studio change or replace my iCloud plan?
Short answer: No. Storage Studio doesn't sell or change iCloud storage. It helps your Mac's own storage go further — keeping iCloud files online-only and moving non-synced folders to an external drive — while iCloud stays Apple's service.
No. Storage Studio doesn't sell, upgrade or manage iCloud storage, and it never touches your iCloud subscription. iCloud stays Apple's service, managed in System Settings.
What Storage Studio does is make your Mac's own storage go further: it keeps iCloud files online-only when you ask, moves big apps and folders that don't need to sync to a fast external drive (leaving a shortcut so they still open), and shows what's using space.
Whether you need a bigger iCloud plan depends on how much you want synced across your devices. Files that only need to live on this Mac often don't need to be in iCloud at all.