Scientific Calculator fx-991

Scientific Calculator fx-991

Step-by-step Math Solver

415 ratings
76 reviews
Free
In-App PurchasesWith Ads

Price history


Details

  • Released
  • Updated
  • February 28, 2023
  • September 19, 2026

Features

Scientific Calculator fx-991 screenshot #1 for iPhone
Scientific Calculator fx-991 screenshot #2 for iPhone
Scientific Calculator fx-991 screenshot #3 for iPhone
Scientific Calculator fx-991 screenshot #4 for iPhone
Scientific Calculator fx-991 screenshot #5 for iPhone
Scientific Calculator fx-991 screenshot #6 for iPhone
Scientific Calculator fx-991 screenshot #7 for iPhone
iphone
ipad
🖼️Get Icon
Icons↘︎

About

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.

✓Step-by-step equation solver
✓Advanced scientific functions
✓Graphing mode
✓Formula library
✓Unit converter
✓Casio fx-991 inspired interface
Show original description

What users say about Scientific Calculator fx

See all reviews

What's New in Scientific Calculator fx

1.9.2

September 19, 2026

* Added one-variable polynomial division with quotient and remainder results. * Improved the formula reference interface. * Added the periodic table of chemical elements. * Added the ability to save and manage favorite formulas. * Improved performance and fixed minor bugs.

More
2

Subscriptions & In-App Purchases

Monthly Premium Access

Full access to premium features for one month

$1.991 Month
How to cancel Scientific Calculator fx subscription ⁉️

User reviews

It’s free and it works

It does what it says and the adds aren’t distracting and they don’t interrupt access to the calculator. There’s an option to pay but the paywall isn’t restricting me from anything I need to use.

🐒

Built just like my actual fx 991 plus thanks

.

Its good but the ads is very annoying.

good app for when you don’t have a physical calculator

really solid calculator app, i’ve used for years whenever i don’t have my t-84 and it does the job. has saved my butt many times!

Best one so far

This has been very helpful for my Electro Technology classes. I don’t own a physical one and this is so useful plus free. There are ads but it’s not that bad they are not in your face. For the most part you can ignore them and they don’t throw it in your face forcing you to pay for it.

Developer apps

User experience

🐞

Reported Bugs

6 issues

App crashes on loading screen

Bug

App closes immediately on opening

Bug

App crashes on iOS 18

Bug

App closes after update

Bug

Cannot upgrade to paid version

Bug

'i' key not working after update

Bug
✨

Requested Features

4 requests

Fix update issue with calculation display

Feature

Fix duplicate log key in Fx-350 layout

Feature

Add CW layout for Casio fx991 cw

Feature

Change ☐² to X² and ☐⁻¹ to X⁻¹

Feature

FAQ

What does the Scientific Calculator fx-991 app do?

This app functions as a powerful scientific calculator designed to help users solve math and science problems. It offers step-by-step solutions for equations, advanced mathematical functions, interactive graphing, an extensive formula library, and a unit converter.

What are the key features of this calculator app?

Key features include a step-by-step equation solver, advanced scientific functions for algebra and calculus, a graphing mode to visualize functions, a comprehensive formula library for math, physics, and chemistry, and a unit converter. It also boasts an interface inspired by the Casio fx-991.

Is this app free to use?

The app is available for free download and use, but it does contain in-app purchases and advertisements. Users may choose to purchase additional features or remove ads through these in-app options.

Who would benefit from using this app?

This app is ideal for high school and college students studying math, physics, and chemistry, as well as engineers and professionals in STEM fields. Its comprehensive features and step-by-step solutions make complex calculations and learning more accessible.

What kind of math problems can this calculator solve?

The calculator can handle a wide range of math problems, including algebra, fractions, trigonometry, derivatives, and integrals. It provides detailed step-by-step solutions to help users understand the problem-solving process.