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

![Scientific Calculator fx-991 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/b3/f2/83/b3f2837f-a7c3-f6a6-d5e1-a26d390d66d9/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/400x400bb.png)

**Developer:** [Dinh Phuc](https://apptail.io/developer/dinh-phuc-gCU) (Vietnam)
**Category:** Education
**Rating:** 4.7/5 (876 ratings)
**Price:** Free
**Bundle ID:** dinhphuc1993.ExemplePhucnd
**Store:** Apple App Store
**Country:** Vietnam
**Version:** 1.9.2 (released 2026-09-19)
**Original Release:** 2023-02-28

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

## 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 Vietnam
- 5 stars: 753 (86%)
- 4 stars: 64 (7%)
- 3 stars: 18 (2%)
- 2 stars: 12 (1%)
- 1 stars: 29 (3%)

## Scientific Calculator fx-991 Reviews in Vietnam

### ***** "Nên sử dụng app"
Xin và tiện
-- Norman yêu Qanh, 2025-01-03

### ***** "Tốt"
Tính nhanh với tiện (ko cần tính hpt 😏)
-- Quanicuc, 2025-01-01

### ***** "Sửa"
Rút kinh nghiệm những những lời ng dùng nhận xét !
-- Kokokoisheh, 2024-12-01

### ***** "Hhhh"
App dùng rất tốt🙂
-- Hoàng racing🙂, 2024-11-22

### ***** "App này ổn nha😍"
Dịu nha, xịn nha
-- Gà zila, 2024-11-15

### ***** "Tuyệt"
Oke
-- DĐuongepzai254, 2024-11-01

### ***** "hay"
quay cóp trong bài dùng app này cũng được😇
-- kim yến dp gái s1tg, 2024-10-14

### *---- "Sai"
Giải sai hệ pt
-- Tít Quạo, 2024-10-13

### ***** "Tốt"
👍
-- game như đầu dùi, 2024-10-02

### ***** "Máy tính"
Ứng dụng tốt mỗi tội thua hàng thật
-- Nhà Đánh Giá Công Tâm 2024, 2024-09-13

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


## Scientific Calculator fx-991 Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Free | Egypt | Education | #3 |
| Top Free | Philippines | Education | #4 |
| Top Free | Malaysia | Education | #8 |
| Top Free | Algeria | Education | #9 |
| Top Free | Ecuador | Education | #12 |
| Top Free | Pakistan | Education | #14 |
| Top Free | Peru | Education | #15 |
| Top Free | Nigeria | Education | #18 |
| Top Free | Colombia | Education | #20 |
| Top Free | Kuwait | Education | #23 |
| Top Free | South Africa | Education | #24 |
| Top Free | Lebanon | Education | #27 |
| Top Free | United Arab Emirates | Education | #33 |
| Top Free | Argentina | Education | #44 |
| Top Free | Saudi Arabia | Education | #57 |
| Top Free | Vietnam | Education | #61 |
| Top Free | Singapore | Education | #67 |
| Top Free | Ireland | Education | #82 |
| Top Free | Mexico | Education | #94 |
| Top Free | Thailand | Education | #100 |
| Top Free | Dominican Republic | Education | #105 |
| Top Free | Chile | Education | #109 |
| Top Free | Israel | Education | #121 |
| Top Free | India | Education | #123 |
| Top Free | Hungary | Education | #126 |
| Top Free | Australia | Education | #136 |
| Top Free | Egypt | Overall | #142 |
| Top Free | Algeria | Overall | #145 |
| Top Free | South Korea | Education | #160 |
| Top Free | France | Education | #185 |
| Top Free | Indonesia | Education | #207 |
| Top Free | New Zealand | Education | #212 |
| Top Free | United Kingdom | Education | #214 |
| Top Free | Poland | Education | #223 |
| Top Free | Hong Kong SAR China | Education | #235 |
| Top Free | Greece | Education | #237 |
| Top Free | Canada | Education | #248 |
| Top Free | Taiwan | Education | #250 |



## 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)
- [Philippines](https://apptail.io/app/scientific-calculator-fx-991-aDTk/philippines)
- [Algeria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/algeria)
- [Ghana](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ghana)
- [Malaysia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/malaysia)
- [Nigeria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nigeria)
- [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)
- [Costa Rica](https://apptail.io/app/scientific-calculator-fx-991-aDTk/costa-rica)
- [Argentina](https://apptail.io/app/scientific-calculator-fx-991-aDTk/argentina)
- [Ecuador](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ecuador)
- [Bolivia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bolivia)
- [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)
- [United Arab Emirates](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-arab-emirates)
- [Brazil](https://apptail.io/app/scientific-calculator-fx-991-aDTk/brazil)
- [Thailand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/thailand)
- [United Kingdom](https://apptail.io/app/scientific-calculator-fx-991-aDTk/united-kingdom)
- [South Korea](https://apptail.io/app/scientific-calculator-fx-991-aDTk/south-korea)
- [China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/china)
- [Canada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/canada)
- [Spain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/spain)
- [Singapore](https://apptail.io/app/scientific-calculator-fx-991-aDTk/singapore)
- [Venezuela](https://apptail.io/app/scientific-calculator-fx-991-aDTk/venezuela)
- [Nepal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nepal)
- [El Salvador](https://apptail.io/app/scientific-calculator-fx-991-aDTk/el-salvador)
- [Australia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/australia)
- [Guatemala](https://apptail.io/app/scientific-calculator-fx-991-aDTk/guatemala)
- [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)
- [Israel](https://apptail.io/app/scientific-calculator-fx-991-aDTk/israel)
- [Italy](https://apptail.io/app/scientific-calculator-fx-991-aDTk/italy)
- [Indonesia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/indonesia)
- [Jordan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jordan)
- [Sri Lanka](https://apptail.io/app/scientific-calculator-fx-991-aDTk/sri-lanka)
- [Nicaragua](https://apptail.io/app/scientific-calculator-fx-991-aDTk/nicaragua)
- [Japan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/japan)
- [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)
- [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)
- [Lebanon](https://apptail.io/app/scientific-calculator-fx-991-aDTk/lebanon)
- [Hong Kong SAR China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/hong-kong)
- [Russia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/russia)
- [Cambodia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cambodia)
- [Dominican Republic](https://apptail.io/app/scientific-calculator-fx-991-aDTk/dominican-republic)
- [Hungary](https://apptail.io/app/scientific-calculator-fx-991-aDTk/hungary)
- [Kenya](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kenya)
- [Türkiye](https://apptail.io/app/scientific-calculator-fx-991-aDTk/turkey)
- [Croatia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/croatia)
- [Taiwan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/taiwan)
- [Ireland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ireland)
- [Portugal](https://apptail.io/app/scientific-calculator-fx-991-aDTk/portugal)
- [Poland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/poland)
- [Greece](https://apptail.io/app/scientific-calculator-fx-991-aDTk/greece)
- [New Zealand](https://apptail.io/app/scientific-calculator-fx-991-aDTk/new-zealand)
- [Jamaica](https://apptail.io/app/scientific-calculator-fx-991-aDTk/jamaica)
- [Kazakhstan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/kazakhstan)
- [Cyprus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cyprus)
- [Sweden](https://apptail.io/app/scientific-calculator-fx-991-aDTk/sweden)
- [Ukraine](https://apptail.io/app/scientific-calculator-fx-991-aDTk/ukraine)
- [Yemen](https://apptail.io/app/scientific-calculator-fx-991-aDTk/yemen)
- [Belgium](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belgium)
- [Bahrain](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bahrain)
- [Armenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/armenia)
- [Barbados](https://apptail.io/app/scientific-calculator-fx-991-aDTk/barbados)
- [Macao SAR China](https://apptail.io/app/scientific-calculator-fx-991-aDTk/macau)
- [Netherlands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/netherlands)
- [Finland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/finland)
- [Lithuania](https://apptail.io/app/scientific-calculator-fx-991-aDTk/lithuania)
- [Bulgaria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/bulgaria)
- [Iceland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/iceland)
- [Madagascar](https://apptail.io/app/scientific-calculator-fx-991-aDTk/madagascar)
- [Angola](https://apptail.io/app/scientific-calculator-fx-991-aDTk/angola)
- [Slovakia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovakia)
- [Guyana](https://apptail.io/app/scientific-calculator-fx-991-aDTk/guyana)
- [Suriname](https://apptail.io/app/scientific-calculator-fx-991-aDTk/suriname)
- [Belarus](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belarus)
- [Grenada](https://apptail.io/app/scientific-calculator-fx-991-aDTk/grenada)
- [Belize](https://apptail.io/app/scientific-calculator-fx-991-aDTk/belize)
- [Estonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/estonia)
- [Switzerland](https://apptail.io/app/scientific-calculator-fx-991-aDTk/switzerland)
- [Austria](https://apptail.io/app/scientific-calculator-fx-991-aDTk/austria)
- [Denmark](https://apptail.io/app/scientific-calculator-fx-991-aDTk/denmark)
- [Uzbekistan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/uzbekistan)
- [Czechia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/czechia)
- [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)
- [Malta](https://apptail.io/app/scientific-calculator-fx-991-aDTk/malta)
- [Norway](https://apptail.io/app/scientific-calculator-fx-991-aDTk/norway)
- [Mali](https://apptail.io/app/scientific-calculator-fx-991-aDTk/mali)
- [British Virgin Islands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/british-virgin-islands)
- [North Macedonia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/north-macedonia)
- [Latvia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/latvia)
- [Luxembourg](https://apptail.io/app/scientific-calculator-fx-991-aDTk/luxembourg)
- [Azerbaijan](https://apptail.io/app/scientific-calculator-fx-991-aDTk/azerbaijan)
- [Romania](https://apptail.io/app/scientific-calculator-fx-991-aDTk/romania)
- [Cayman Islands](https://apptail.io/app/scientific-calculator-fx-991-aDTk/cayman-islands)
- [Botswana](https://apptail.io/app/scientific-calculator-fx-991-aDTk/botswana)
- [Slovenia](https://apptail.io/app/scientific-calculator-fx-991-aDTk/slovenia)

---

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