250+ iOS apps curated and reviewed
The best simple interest calculator apps on iPhone average 4.5★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 3.7★ (3) | No | No | Oct 2026 | |
| 2 |  | Free | 4.9★ (106K) | Yes | No | Nov 2026 | |
| 3 |  | Free | 5.0★ (3) | No | No | Oct 2026 | |
| 4 |  | Free | — | Yes | Yes | May 2026 | |
| 5 |  | Free | 4.6★ (23K) | Yes | Yes | Nov 2026 | |
| 6 |  | Free | — | No | No | Nov 2026 | |
| 7 |  | Free | — | Yes | No | Aug 2026 | |
| 8 |  | Free | — | Yes | No | Sep 2026 |
This tool quickly and accurately calculates simple interest based on amount, interest rate, and duration. It supports calculations for monthly or yearly rates and can determine interest between specific dates or for a given period in years, months, or days.
Easily calculate loan or mortgage payments. Simply input the loan amount, repayment term, and interest rate to get your estimated monthly payment.
This app simplifies financial planning by providing quick and accurate calculations for both simple and compound interest. It offers an intuitive interface, customizable parameters, and dual display modes for numerical and graphical results. Track your financial progress and learn the fundamentals of interest calculation.
