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Dynamic topology uses more memory (when you reload a project it’s disabled)
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The history takes memory as well (cleared when you reload a project)
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Displaying the wireframe as well adds a bit of memory as well
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“Free” is a value returned by iOS directly, so if you see a low value it means it can crash at any moment
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“Used” is a value that I compute manually. It’s a lower estimate as I might miss stuffs when computing it, but overall it should be accurate.
Yes the 1gb difference is for iOS but it’s up to iOS to decide when to kill the app.
Small tip: It’s not 100 robust but you can use “partial drawing” at the bottom of the Settings panel if you want to sculpt very small changes (while using dynamic topology for example)