Scientific Calculator fx-991
Scientific Calculator fx-991 is #61 in Education Free in Saudi Arabia and charting in 2 of 24 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperDinh Phuc
CategoryEducation
PriceFree
Released
Rating★ 4.8 (167)
Version1.9.2
Age rating4+
First seen by us
24 Sep 2026
24 Sep 2026Installs (est.)100k+ worldwide
Rating
4.8 ★
167 ratings
Measured
Best rank now
#61
Education FreeMeasured
Scientific Calculator fx-991 on the App Store
App details
App ID
1673640297
Publisher
Dinh Phuc
Minimum OS
iOS 15.0+
Content rating
4+
Languages
59
AF SQ AR HY AZ EU BE BG CA HR CS DA …
Size
28 MB
Scientific Calculator fx-991 downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Scientific Calculator fx-991's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How Scientific Calculator fx-991 makes money: subscriptions, one-off purchases and ads.
Ads · 1 ad networks
Ads
/mo
of revenue
Where it ranks now
Every top chart it appears in across 24 countries.
| Country | Charts | Rank |
|---|---|---|
| Saudi Arabia | EducationFree | #61 |
 United Arab Emirates | EducationFree | #51 |
Apps near Scientific Calculator fx-991 on the chart
Education Free, around #61.
Ratings
App Store, worldwide.
Rating
4.8 ★
167 ratings
Measured
Ratings
167
Measured
About Scientific Calculator fx-991
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): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
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): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
Latest updates
1.9.2
* 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.