https://wccftech.com/ios-4-recreated-as-iphone-app-by-developer/

iOS 4 is a dated operating system update that was first introduced by Apple nearly a decade ago. Since then, the company has introduced a boatload of changes to its mobile platform, ranging from cosmetic shifts to an increase in features, not to mention a few controversial moves along the way. If you still miss iOS 4 and want to have a stroll down memory lane, one 18-year-old developer has managed to recreate the update, but as a separate iPhone app. Check out the details below.

According to Zane, OldOS, which he has named as his recreated iOS 4, the app is ‘designed to be as close to pixel-perfect as possible’ and for one reason, we might have to take his word for it. The app is built using Apple’s SwiftUI, meaning that if you download and install OldOS, you will experience the same smooth animations, as well as that ‘blast from the past’ iPhone Home button that vibrates and provides a haptic feedback to make it feel like an actual button.