---
title: "Scientific Calculator fx-991 - Reviews, Revenue and Downloads in Philippines | 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 — Philippines
> Step-by-step Math Solver

![Scientific Calculator fx-991 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/b3/df/36/b3df3608-60c9-cd70-5636-3f30e9d11855/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:** 4.8/5 (179 ratings)
**Price:** Free
**Bundle ID:** dinhphuc1993.ExemplePhucnd
**Store:** Apple App Store
**Country:** Philippines
**Version:** 1.8.2 (released 2026-04-24)
**Original Release:** 2023-02-28
**Languages:** English, Afrikaans, Albanian, Arabic, Armenian, Azerbaijani, Basque, Belarusian, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, Galician, Georgian, German, Greek (modern), Gujarati, Hebrew (modern), Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kannada, Kazakh, Korean, Kirghiz, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Mongolian, Nepali, Norwegian Bokmål, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Chinese, Sinhala, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Urdu, Vietnamese, Zulu

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

## 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 Philippines
- 5 stars: 162 (91%)
- 4 stars: 9 (5%)
- 3 stars: 5 (3%)
- 2 stars: 0 (0%)
- 1 stars: 3 (2%)

## Scientific Calculator fx-991 Reviews in Philippines

### ***** "Good"
SOOO HELPFUL, there’s add on top of it but it’s fine
-- x4v1lat, 2026-03-29

### ***** "Wow"
It’s a very good calculator. Please download this
-- Kalvin Chua, 2026-03-10

### ***** "very accurate"
tes
-- Thousandcps, 2026-02-13

### ***-- "Small issue"
It alright, its very useful although i have one problem which is the s<>d
It seems not to be working all of the sudden, it used to work well but now its not
I cant able to know the answer in fraction but the decimals only (for example 60/360 and the answer gives me 0.1666 but i cant change it in to fraction since the s<> isnt working)
Is there any way to fix this problem?
-- poppyloppyloop, 2025-10-19

### *---- "Definite integration is not accurate"
Took me an hour what was wrong with my calculation. Turned out it was not my mistake. The definite integration of this calculator is not accurate to a very significant figure.
-- M.Eng’g-CE., 2025-06-07

[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 | 249.00 ₱ |
| Monthly Premium Access | 29.00 ₱ |
| 6-Month Premium Membership | 149.00 ₱ |

## Scientific Calculator fx-991 Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Free | Egypt | Education | #5 |
| Top Free | Algeria | Education | #6 |
| Top Free | Pakistan | Education | #10 |
| Top Free | Peru | Education | #11 |
| Top Free | South Africa | Education | #18 |
| Top Free | Kuwait | Education | #21 |
| Top Free | Philippines | Education | #23 |
| Top Free | Ecuador | Education | #24 |
| Top Free | Lebanon | Education | #25 |
| Top Free | Colombia | Education | #26 |
| Top Free | Malaysia | Education | #28 |
| Top Free | Nigeria | Education | #30 |
| Top Free | Vietnam | Education | #47 |
| Top Free | Argentina | Education | #57 |
| Top Free | United Arab Emirates | Education | #61 |
| Top Free | Saudi Arabia | Education | #62 |
| Top Free | Singapore | Education | #66 |
| Top Free | Chile | Education | #82 |
| Top Free | Mexico | Education | #109 |
| Top Free | Israel | Education | #111 |
| Top Free | Hungary | Education | #123 |
| Top Free | India | Education | #157 |
| Top Free | Algeria | Overall | #171 |
| Top Free | Ireland | Education | #225 |
| Top Free | Egypt | Overall | #229 |
| Top Free | South Korea | Education | #248 |
| Top Free | Dominican Republic | Education | #265 |
| Top Free | Indonesia | Education | #278 |
| Top Free | United Kingdom | Education | #279 |
| Top Free | Thailand | Education | #287 |
| Top Free | France | Education | #320 |
| Top Free | Canada | Education | #334 |
| Top Free | Spain | Education | #337 |
| Top Free | Australia | Education | #347 |
| Top Free | Italy | Education | #354 |
| Top Free | Peru | Overall | #396 |
| Top Free | United States | Education | #408 |
| Top Free | Czechia | Education | #475 |

## Scientific Calculator fx-991 Discovered Keywords
- scientific
- hiedu scientific calculator

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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)
- [Mexico](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mexico)
- [United States](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-states)
- [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)
- [Ecuador](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ecuador)
- [Malaysia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/malaysia)
- [Chile](https://apptail.io/app/scientific-calculator-fx-991-aDTk/chile)
- [Paraguay](https://apptail.io/app/scientific-calculator-fx-991-aDTk/paraguay)
- [Brazil](https://apptail.io/app/scientific-calculator-fx-991-aDTk/brazil)
- [France](https://apptail.io/app/scientific-calculator-fx-991-aDTk/france)
- [Thailand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/thailand)
- [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)
- [China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/china)
- [United Kingdom](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-kingdom)
- [Spain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/spain)
- [Singapore](https://apptail.io/app/scientific-calculator-fx-991-aDTk/singapore)
- [Canada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/canada)
- [Senegal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/senegal)
- [Nepal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nepal)
- [Germany](https://apptail.io/app/scientific-calculator-fx-991-aDTk/germany)
- [Kuwait](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kuwait)
- [Israel](https://apptail.io/app/scientific-calculator-fx-991-aDTk/israel)
- [Oman](https://apptail.io/app/scientific-calculator-fx-991-aDTk/oman)
- [Australia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/australia)
- [Indonesia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/indonesia)
- [Italy](https://apptail.io/app/scientific-calculator-fx-991-aDTk/italy)
- [Uruguay](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uruguay)
- [Tunisia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/tunisia)
- [Japan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/japan)
- [Sri Lanka](https://apptail.io/app/scientific-calculator-fx-991-aDTk/sri-lanka)
- [Honduras](https://apptail.io/app/scientific-calculator-fx-991-aDTk/honduras)
- [Jordan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jordan)
- [Namibia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/namibia)
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- [Panama](https://apptail.io/app/scientific-calculator-fx-991-aDTk/panama)
- [Uganda](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uganda)
- [Russia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/russia)
- [Lebanon](https://apptail.io/app/scientific-calculator-fx-991-aDTk/lebanon)
- [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)
- [Hungary](https://apptail.io/app/scientific-calculator-fx-991-aDTk/hungary)
- [Türkiye](https://apptail.io/app/scientific-calculator-fx-991-aDTk/turkey)
- [Taiwan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/taiwan)
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- [Croatia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/croatia)
- [Portugal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/portugal)
- [Poland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/poland)
- [Kazakhstan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kazakhstan)
- [Cyprus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cyprus)
- [Ireland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ireland)
- [Ukraine](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ukraine)
- [Jamaica](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jamaica)
- [New Zealand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/new-zealand)
- [Macao SAR China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/macau)
- [Madagascar](https://apptail.io/app/scientific-calculator-fx-991-aDTk/madagascar)
- [Finland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/finland)
- [Bahrain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bahrain)
- [Angola](https://apptail.io/app/scientific-calculator-fx-991-aDTk/angola)
- [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)
- [Azerbaijan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/azerbaijan)
- [Denmark](https://apptail.io/app/scientific-calculator-fx-991-aDTk/denmark)
- [Slovenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovenia)
- [Slovakia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovakia)
- [Cayman Islands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cayman-islands)
- [Armenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/armenia)
- [Grenada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/grenada)
- [Czechia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/czechia)
- [Austria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/austria)
- [Uzbekistan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uzbekistan)
- [Belarus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belarus)
- [Estonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/estonia)
- [Netherlands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/netherlands)
- [Norway](https://apptail.io/app/scientific-calculator-fx-991-aDTk/norway)
- [Switzerland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/switzerland)
- [Mauritius](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mauritius)
- [Brunei](https://apptail.io/app/scientific-calculator-fx-991-aDTk/brunei)
- [Bermuda](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bermuda)
- [Mali](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mali)
- [North Macedonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/north-macedonia)
- [Romania](https://apptail.io/app/scientific-calculator-fx-991-aDTk/romania)
- [Latvia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/latvia)

---

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