---
title: "Scientific Calculator fx-991 - Reviews, Revenue and Downloads in Nigeria | Apple App Store"
description: "Scientific Calculator fx-991 – The Ultimate Math & Science Tool! Struggling with math problems, equations, or integrals?  Need a powerful scientific calculator to solve step-by-step?  With Scientific "
---

# Scientific Calculator fx-991 — Nigeria
> Step-by-step Math Solver

![Scientific Calculator fx-991 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/30/69/64/306964b9-0c46-8351-48a4-7fe9a077768f/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Dinh Phuc](https://apptail.io/developer/dinh-phuc-gCU) (Vietnam)
**Category:** Education
**Rating:** 4.3/5 (149 ratings)
**Price:** Free
**Bundle ID:** dinhphuc1993.ExemplePhucnd
**Store:** Apple App Store
**Country:** Nigeria
**Version:** 1.8.8 (released 2026-05-23)
**Original Release:** 2023-02-28
**Languages:** Romanian, Afrikaans, Albanian, Arabic, Armenian, Azerbaijani, Basque, Belarusian, Bulgarian, Catalan, Czech, Chinese, Korean, Croatian, Danish, Hebrew (modern), English, Estonian, Finnish, French, Galician, Georgian, German, Greek (modern), Gujarati, Hindi, Indonesian, Icelandic, Italian, Japanese, Kannada, Kazakh, Kirghiz, Latvian, Lithuanian, Macedonian, Hungarian, Malay, Malayalam, Mongolian, Nepali, Norwegian Bokmål, Dutch, Persian, Polish, Portuguese, Russian, Serbian, Sinhala, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Urdu, Vietnamese, Zulu

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/ng/app/app/id1673640297)
**AppTail Page:** [https://apptail.io/app/scientific-calculator-fx-991-aDTk/nigeria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nigeria)

## Scientific Calculator fx-991 Description
Scientific Calculator fx-991 – The Ultimate Math & Science Tool!
Struggling with math problems, equations, or integrals?  Need a powerful scientific calculator to solve step-by-step?

With Scientific Calculator fx-991, you can calculate, graph, and find formulas instantly – making learning math, physics, and chemistry easier than ever! 

Key Features
+ Step-by-step equation solver – Enter any equation and get a detailed step-by-step solution.
+ Advanced scientific functions – Solve fractions, algebra, derivatives, integrals, trigonometry, and more.
+ Graphing mode – Visualize mathematical functions interactively.
+ Extensive formula library – Access key formulas for math, physics, and chemistry in seconds.
+ Unit converter – Quickly convert between different measurement units.
+ Casio fx-991 inspired interface – A familiar and intuitive experience for students.

 Perfect for high school and college students, engineers, and professionals in STEM fields!

 Who is this app for?
High school students – Solve algebra, calculus, and physics problems efficiently.
 College & university students – Master engineering, physics, and complex math subjects.
 STEM professionals – Perform advanced calculations quickly and accurately.

 Download Scientific Calculator fx-991 now and simplify your calculations! 
Terms of Use (EULA): 

## Scientific Calculator fx-991 Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f6/a4/ae/f6a4ae48-2798-f2f7-0de7-6f077231bd52/anh1_ios.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/43/d9/41/43d94116-8af3-5d00-0106-f3d47379f8c5/anh2_IOS.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f1/57/16/f15716e7-16bc-50ed-3297-6b9490935db7/anh3_IOS.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/26/a3/05/26a30539-bf0e-22f4-b3ce-095cb2307cfd/3.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/46/f1/7e/46f17ec0-4de1-6a0e-175b-08846db9ccc7/4.png/1284x2778.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/bb/d6/a8/bbd6a8be-0f59-cd54-58db-d62299d0b88c/en5.png/1284x2778.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/09/d8/7c/09d87c89-d36e-7c59-86fb-ea869ffe98a1/en6.png/1284x2778.png)

## Scientific Calculator fx-991 Rating Breakdown in Nigeria
- 5 stars: 96 (64%)
- 4 stars: 26 (17%)
- 3 stars: 10 (7%)
- 2 stars: 11 (7%)
- 1 stars: 6 (4%)

## Scientific Calculator fx-991 Reviews in Nigeria

### ***** "Awesome"
It’s been good so far 
Cheers
-- Mystery box1234, 2025-01-01

### ***** "Very smart calculator"
Love the calculator
-- 5)7899fhu, 2024-11-25

### ***** "Awesome"
Really good app
-- Règgié, 2024-09-19

### ***** "Really good app keep it up"
I really love dis calculator no too much ads and very efficient 🥱👏👏
Im very glad the creators made this exciting calculator 
The accuracy is 😘
-- swaddiq, 2023-12-27

[View all Scientific Calculator fx-991 reviews and detailed analytics on AppTail](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Scientific Calculator fx-991 In-App Purchases
| Item | Price |
|------|-------|
| Yearly Premium Access | 3,900.00 ₦ |
| Monthly Premium Access | 300.00 ₦ |
| 6-Month Premium Membership | 1,900.00 ₦ |

## Scientific Calculator fx-991 Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Free | Egypt | Education | #5 |
| Top Free | Pakistan | Education | #14 |
| Top Free | Algeria | Education | #14 |
| Top Free | Malaysia | Education | #19 |
| Top Free | Ecuador | Education | #19 |
| Top Free | South Africa | Education | #20 |
| Top Free | Lebanon | Education | #22 |
| Top Free | Kuwait | Education | #23 |
| Top Free | Nigeria | Education | #25 |
| Top Free | Philippines | Education | #25 |
| Top Free | Peru | Education | #36 |
| Top Free | Singapore | Education | #41 |
| Top Free | Saudi Arabia | Education | #46 |
| Top Free | United Arab Emirates | Education | #52 |
| Top Free | Vietnam | Education | #53 |
| Top Free | Colombia | Education | #57 |
| Top Free | Thailand | Education | #62 |
| Top Free | Argentina | Education | #105 |
| Top Free | Chile | Education | #105 |
| Top Free | Ireland | Education | #141 |
| Top Free | Israel | Education | #188 |
| Top Free | Mexico | Education | #194 |
| Top Free | Hungary | Education | #199 |
| Top Free | New Zealand | Education | #216 |
| Top Free | India | Education | #220 |
| Top Free | Australia | Education | #223 |
| Top Free | South Korea | Education | #226 |
| Top Free | Egypt | Overall | #243 |
| Top Free | Portugal | Education | #257 |
| Top Free | Taiwan | Education | #258 |
| Top Free | United Kingdom | Education | #293 |
| Top Free | Algeria | Overall | #298 |
| Top Free | Italy | Education | #313 |
| Top Free | France | Education | #335 |
| Top Free | Spain | Education | #346 |
| Top Free | United States | Education | #370 |
| Top Free | South Africa | Overall | #381 |
| Top Free | Indonesia | Education | #399 |
| Top Free | Hong Kong SAR China | Education | #447 |
| Top Free | Romania | Education | #465 |
| Top Free | Canada | Education | #483 |


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## Scientific Calculator fx-991 Available In
- [Vietnam](https://apptail.io/app/scientific-calculator-fx-991-aDTk/vietnam)
- [Egypt](https://apptail.io/app/scientific-calculator-fx-991-aDTk/egypt)
- [United States](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-states)
- [Mexico](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mexico)
- [South Africa](https://apptail.io/app/scientific-calculator-fx-991-aDTk/south-africa)
- [Colombia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/colombia)
- [Peru](https://apptail.io/app/scientific-calculator-fx-991-aDTk/peru)
- [Algeria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/algeria)
- [Philippines](https://apptail.io/app/scientific-calculator-fx-991-aDTk/philippines)
- [Nigeria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nigeria)
- [Ghana](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ghana)
- [India](https://apptail.io/app/scientific-calculator-fx-991-aDTk/india)
- [Pakistan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/pakistan)
- [Saudi Arabia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/saudi-arabia)
- [Argentina](https://apptail.io/app/scientific-calculator-fx-991-aDTk/argentina)
- [Malaysia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/malaysia)
- [Ecuador](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ecuador)
- [Chile](https://apptail.io/app/scientific-calculator-fx-991-aDTk/chile)
- [Paraguay](https://apptail.io/app/scientific-calculator-fx-991-aDTk/paraguay)
- [France](https://apptail.io/app/scientific-calculator-fx-991-aDTk/france)
- [Brazil](https://apptail.io/app/scientific-calculator-fx-991-aDTk/brazil)
- [South Korea](https://apptail.io/app/scientific-calculator-fx-991-aDTk/south-korea)
- [United Arab Emirates](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-arab-emirates)
- [Thailand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/thailand)
- [United Kingdom](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-kingdom)
- [China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/china)
- [Canada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/canada)
- [Singapore](https://apptail.io/app/scientific-calculator-fx-991-aDTk/singapore)
- [Spain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/spain)
- [Nepal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nepal)
- [Senegal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/senegal)
- [Kuwait](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kuwait)
- [Germany](https://apptail.io/app/scientific-calculator-fx-991-aDTk/germany)
- [Tunisia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/tunisia)
- [Australia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/australia)
- [Israel](https://apptail.io/app/scientific-calculator-fx-991-aDTk/israel)
- [Sri Lanka](https://apptail.io/app/scientific-calculator-fx-991-aDTk/sri-lanka)
- [Italy](https://apptail.io/app/scientific-calculator-fx-991-aDTk/italy)
- [Indonesia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/indonesia)
- [Oman](https://apptail.io/app/scientific-calculator-fx-991-aDTk/oman)
- [Uruguay](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uruguay)
- [Panama](https://apptail.io/app/scientific-calculator-fx-991-aDTk/panama)
- [Qatar](https://apptail.io/app/scientific-calculator-fx-991-aDTk/qatar)
- [Japan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/japan)
- [Uganda](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uganda)
- [Namibia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/namibia)
- [Honduras](https://apptail.io/app/scientific-calculator-fx-991-aDTk/honduras)
- [Jordan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jordan)
- [Lebanon](https://apptail.io/app/scientific-calculator-fx-991-aDTk/lebanon)
- [Russia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/russia)
- [Dominican Republic](https://apptail.io/app/scientific-calculator-fx-991-aDTk/dominican-republic)
- [Hong Kong SAR China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/hong-kong)
- [Kenya](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kenya)
- [Türkiye](https://apptail.io/app/scientific-calculator-fx-991-aDTk/turkey)
- [Hungary](https://apptail.io/app/scientific-calculator-fx-991-aDTk/hungary)
- [Taiwan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/taiwan)
- [Croatia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/croatia)
- [Greece](https://apptail.io/app/scientific-calculator-fx-991-aDTk/greece)
- [Poland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/poland)
- [Portugal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/portugal)
- [Kazakhstan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kazakhstan)
- [Cyprus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cyprus)
- [Ukraine](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ukraine)
- [New Zealand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/new-zealand)
- [Ireland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ireland)
- [Jamaica](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jamaica)
- [Belgium](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belgium)
- [Iceland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/iceland)
- [Sweden](https://apptail.io/app/scientific-calculator-fx-991-aDTk/sweden)
- [Bahrain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bahrain)
- [Finland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/finland)
- [Madagascar](https://apptail.io/app/scientific-calculator-fx-991-aDTk/madagascar)
- [Macao SAR China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/macau)
- [Angola](https://apptail.io/app/scientific-calculator-fx-991-aDTk/angola)
- [Armenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/armenia)
- [Denmark](https://apptail.io/app/scientific-calculator-fx-991-aDTk/denmark)
- [Estonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/estonia)
- [Czechia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/czechia)
- [Grenada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/grenada)
- [Switzerland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/switzerland)
- [Cayman Islands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cayman-islands)
- [Latvia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/latvia)
- [North Macedonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/north-macedonia)
- [Mali](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mali)
- [Malta](https://apptail.io/app/scientific-calculator-fx-991-aDTk/malta)
- [Mauritius](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mauritius)
- [Belize](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belize)
- [Belarus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belarus)
- [Brunei](https://apptail.io/app/scientific-calculator-fx-991-aDTk/brunei)
- [Netherlands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/netherlands)
- [Norway](https://apptail.io/app/scientific-calculator-fx-991-aDTk/norway)
- [Bermuda](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bermuda)
- [Azerbaijan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/azerbaijan)
- [Romania](https://apptail.io/app/scientific-calculator-fx-991-aDTk/romania)
- [Slovenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovenia)
- [Slovakia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovakia)
- [Austria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/austria)
- [Uzbekistan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uzbekistan)

---

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