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Scientific Calculator fx-991

Scientific Calculator fx-991

Step-by-step Math Solver

381 ratings
65 reviews
With Ads
📚 Education
Free
In-App PurchasesWith Ads

Price history

Details

  • Released
  • Updated
  • February 28, 2023
  • July 25, 2026

Features

Developer

Dinh Phuc
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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's New in Scientific Calculator fx

1.8.9

July 25, 2026

∙ More detailed step-by-step solutions for equations and inequalities. ∙ Added mathematical concepts, solution steps, answer verification, and similar practice exercises. ∙ Performance improvements and bug fixes.

More

Subscription plans

Monthly Premium Access

Full access to premium features for one month

$1.991 Month
How to cancel Scientific Calculator fx subscription ⁉️
2

In-App Purchases

$0.99

Remove Ads 30 Days

Remove ads for 30 days.

User reviews

Most RecentHighest RatedLowest Rated

I love this, good stuff ☝️🤓

I love this, good stuff ☝️🤓
LlantathLlantath

Response from developer

Amazing! Thank you for the 5-star review! 💖 We are so happy to know that you are satisfied with the app. If you have any suggestions to make it even better, feel free to share! 😊

Really awesome

Super easy to use and free!!
star lollystar lolly

Response from developer

Thank you so much for your 5-star rating! 🌟 Your support is a great motivation for us to continue developing and improving the app. We wish you a fantastic experience with HiEdu! 🚀

Reseña de Marcus

Es la aplicación más curada y útil me llamo marcushh el ora aya tata
LolomarcuchhLolomarcuchh

Response from developer

¡Hola Marcus! 😊 Muchas gracias por tu reseña y tus amables palabras. Nos alegra mucho saber que consideras nuestra aplicación útil y bien cuidada. Seguiremos trabajando para ofrecer la mejor experiencia posible. ¡Gracias por tu apoyo! 🙏

Rev

Quite fast and easy to use
Guy_sensei123Guy_sensei123

Response from developer

Amazing! Thank you for the 5-star review! 💖 We are so happy to know that you are satisfied with the app. If you have any suggestions to make it even better, feel free to share! 😊

공학용계산 잘 됨

복소수 계산 주로 사용중
은혜감사드림은혜감사드림

Response from developer

별 5개 평점을 주셔서 정말 감사합니다! 🌟 여러분의 응원은 저희가 앱을 계속 개발하고 개선하는 데 큰 동기가 됩니다. HiEdu와 함께 즐거운 시간을 보내시길 바랍니다! 🚀

See 60 more reviews

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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.