iosdesignkit.io hosts a series of free GUI kits covering older iOS versions (this one is iOS 12), as Sketch/PSD-style component libraries matching that release's actual system UI.
Having the exact period-accurate components saves recreating an old iOS look by eye when the work calls for it, rather than approximating from memory or screenshots.
Useful for maintaining or referencing a legacy app still targeting iOS 12-era design, or for historical/educational comparison against current iOS: not for new app design.
iOS 12 is several major versions behind current iOS: for any new project, Apple's own official Design Resources kit has the current UI, not this one.
Screens and components for iOS 12, sized for iPhone XS and iPhone 8.
