250+ iOS apps curated and reviewed
Every iPhone needs a few good scientific calculator fx-991 apps. We benchmark 250+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.5★ (391) | Yes | Yes | Sep 2026 |
| 2 |  | Free | 4.7★ (12K) | Yes | Yes | Sep 2026 |
| 3 |  | Free was $4.99 | 2.3★ (3) | No | Yes | Aug 2026 |
| 4 |  | Free | 4.7★ (254) | Yes | Yes | Sep 2026 |
| 5 |  | Free | 4.8★ (1.9K) | Yes | No | Sep 2026 |
| 6 |  | Free | 5.0★ (1) | Yes | Yes | Aug 2026 |
| 7 |  | Free | — | Yes | No | Aug 2026 |
| 8 |  | Free | — | Yes | No | May 2026 |
This app provides a powerful scientific calculator with step-by-step solutions for equations, advanced functions, and graphing capabilities. It includes a formula library and unit converter, inspired by a popular Casio model, to aid in learning and problem-solving for math and science subjects.
This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.
This academic calculator displays mathematical expressions in natural textbook format, including fractions and roots. It provides exact form results and supports complex numbers, trigonometry, and advanced math functions. Store values in variables and access calculation history.
This app offers advanced scientific calculation capabilities, including symbolic algebra, equation solving, and calculus functions. It supports high precision, natural expression input, and various display formats. Users can also visualize functions and equations with 2D and 3D graphing.
This app functions as a scientific calculator, enabling users to input and edit complex formulas with ease. It supports formula history, variable memory, and various number system conversions for accurate calculations.
Perform complex calculations with a natural input interface. This app offers instant results in both number and expression formats, supporting a wide range of mathematical functions. Enjoy a clean design with customizable options and offline availability.
This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.
This app offers a free, powerful alternative to hardware graphing calculators. It supports basic to complex math, including graphing, statistics, and matrix operations, with a built-in user manual for assistance.
