For those owning an iPhone 4, 4S, or 5, iOS 7 was often the peak of the device's lifecycle. However, if you wipe an old device today, you’ll find that 90% of the modern App Store is "incompatible with this iPhone."
If you are looking for specific apps to install on an iOS 7 device, the following community archives are the most reliable sources: ios 7 ipa archive
An Archaeology of Mobile Software: Preservation, Structure, and Significance of the iOS 7 IPA Archive For those owning an iPhone 4, 4S, or
If your iOS 7 device is jailbroken, is a must-have. It bypasses the signature check, allowing you to install any IPA file from your archive directly through a file manager like Filza or over USB via iMazing. 3. Legacy iTunes Versions For those owning an iPhone 4