Acorn's (an image editor) model is also good: They release major versions as separate apps on the App Store; Acorn 4, Acorn 5, Acorn 6. They're permanent purcha

Acorn's (an image editor) model is also good: They release major versions as separate apps on the App Store; Acorn 4, Acorn 5, Acorn 6. They're permanent purchases, and only the latest version is visible but if you had purchased previous versions you can redownload them from the App Store. https://apps.apple.com/us/app/acorn-6-image-editor/id1233861775 https://apps.apple.com/us/app/acorn-6-image-editor/id1233861...