Loan & Lease is a Financial Calculator

The App is available to download from the Apple App Store.  It is capable of running on iPhone, iPad (iOS 13 and higher) and Mac (macOS 10.15 and higher).  The free version supports the standard annuity calculations, while the subscription version also supports non-standard start dates, seasonal payments, variable payment profiles, project drawdowns and variation of the first payment date.

You can download it from the Apple App Store here: App Store