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Best Scientific Calculator Plus 991 Apps

249+ iOS apps curated and reviewed

4.5 avg rating
19 free apps
Updated September 2026

If you already know Scientific Calculator Plus 991, this is the deeper bench. 249+ scientific calculator plus 991 apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of September 2026.

Compare top Scientific Calculator Plus 991 Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Scientific Calculator Plus 991Scientific Calculator Plus 991Free4.7★ (12K)YesYesSep 2026
2Scientific Calculator fx-991Scientific Calculator fx-991Free4.5★ (404)YesYesSep 2026
3HiPER Scientific CalculatorHiPER Scientific CalculatorFree4.7★ (256)YesYesSep 2026
4Calculator #Calculator #Free4.6★ (36K)YesYesSep 2026
5Scientific Calculator FX-991CWScientific Calculator FX-991CWFree—NoYesAug 2026
6Scientific Calculator - CalScientific Calculator - CalFree5.0★ (1)YesYesAug 2026
7Calculator with History TapeCalculator with History TapeFree4.7★ (3.2K)NoYesSep 2026
8CalC - Scientific CalculatorCalC - Scientific CalculatorFree—NoYesMay 2026

Top Picks for Scientific Calculator Plus 991

Scientific Calculator Plus 991#1

Scientific Calculator Plus 991 by Tran Duy

NCalc & CalcES Calculator 115
Editor's Choice
📚 Education
4.7😊(12K ratings)
FreeAdsIn-App Purchases
Scientific Calculator Plus 991 screenshot 1
Scientific Calculator Plus 991 screenshot 2
Scientific Calculator Plus 991 screenshot 3
Scientific Calculator Plus 991 screenshot 4
Scientific Calculator Plus 991 screenshot 5
Scientific Calculator Plus 991 screenshot 6

This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.

What We Love

  • 👍 Intuitive and easy to use
  • 🚀 Powerful and feature-rich
  • 💡 Customizable interface and settings
  • 🔍 Extensive library of formulas and equations
  • ⚙️ Handles complex math and scientific functions well
  • 🧠 Helpful for STEM students and professionals

Room to Improve

  • 🐛 Occasional bugs and input issues
  • 🔀 Confusing layout and button placement
  • 💰 Some advanced features locked behind paywall
Scientific Calculator fx-991#2

Scientific Calculator fx-991 by Dinh Phuc

Step-by-step Math Solver
Strong Contender
📚 Education
4.5😊(404 ratings)
FreeAdsIn-App Purchases
Scientific Calculator fx-991 screenshot 1
Scientific Calculator fx-991 screenshot 2
Scientific Calculator fx-991 screenshot 3
Scientific Calculator fx-991 screenshot 4
Scientific Calculator fx-991 screenshot 5
Scientific Calculator fx-991 screenshot 6

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.

What We Love

  • 👍 Very helpful for classes
  • 💰 Free to use
  • 👍 Useful without physical calculator
  • 👍 Good for engineering students
  • 👍 Handles imaginary numbers
  • 👍 Super easy to use
  • 🚀 Fast and easy to use
  • 👍 Very helpful
  • 👍 Exactly like physical calculator
  • 👍 Faster than normal calculator
  • 👍 Accurate and easy to use
  • 👍 Replaced physical calculator
  • 👍 Useful for school
  • 👍 Good for revision
  • 👍 Similar to Casio
  • 👍 Convenient interface
  • 👍 Aesthetic and good for math
  • 👍 User interface is great
  • 👍 Genuine with many functions
  • 👍 Helpful for exams
  • 👍 Precise calculations
  • 👍 Complete and easy

Room to Improve

  • 🐛 Latest update inconvenient
  • 🐛 Update overrides calculations
  • 🐛 Mistake in challenge section
  • 🐛 Removed important buttons
  • 🐛 Cannot find pi button
  • 🐛 Simplified interface
  • 🐛 Duplicate log key
  • 🐛 Cannot change keyboard layout
  • 🐛 No 3-dot menu
  • 🐛 Can't upgrade to paid version
  • 🐛 App crashes on loading screen
  • 🐛 App closes on opening
  • 🐛 New layout missing CW
  • 🐛 'i' key not working after update
HiPER Scientific Calculator#3

HiPER Scientific Calculator by Jindrich Houska

Worth Considering
🔧 Utilities
4.7😊(256 ratings)
FreeAdsIn-App Purchases
HiPER Scientific Calculator screenshot 1
HiPER Scientific Calculator screenshot 2
HiPER Scientific Calculator screenshot 3
HiPER Scientific Calculator screenshot 4
HiPER Scientific Calculator screenshot 5
HiPER Scientific Calculator screenshot 6

This app offers advanced scientific calculation capabilities, including symbolic algebra, equation solving, and calculus functions. It supports high precision, natural expression input, and various display formats. Users can also visualize functions and equations with 2D and 3D graphing.

What We Love

  • 👍 Excellent functionality for technical users
  • 💡 Custom functions for non-trivial calculations
  • 👍 Great expression screen, easy to navigate
  • 👍 Accurate and intuitive UI
  • 👍 Remains the best after years of use
  • 👍 Excellent HP calculator emulation
  • 👍 Super complete and functional
  • 👍 Most advanced calculator available
  • 👍 Feels like a real scientific calculator
  • 👍 Very useful for exams
  • 👍 Best calculator on App Store and Google Play
  • 👍 Well-designed and robust

Room to Improve

  • 🐛 Keyboard unresponsive at times
  • 🐛 Ads in paid version
  • 🐛 iOS version lacks RPN mode
  • 🐛 iOS version lacks themes
  • 🐛 iOS version lacks custom functions
  • 🐛 iOS version lacks variables
  • 🐛 iPad version locked to landscape
  • 🐛 No custom fonts or skins on iPad
  • 🐛 Paid upgrade offers after purchase
  • 🐛 Expensive for some users
  • 🐛 iOS version has unreadable white text on dark background
  • 🐛 Android button feedback missing on iOS
  • 🐛 iOS buttons look more stripped back than Android

More Scientific Calculator Plus 991 apps to explore

FAQ about Scientific Calculator Plus 991

What are the best scientific calculator plus 991 apps for iPhone?
Scientific Calculator Plus 991 tops our scientific calculator plus 991 apps ranking as of September 2026, with a 4.7-star average from 12K App Store ratings, and it's free to download.
Yes — 19 of the top scientific calculator plus 991 apps we rank are free to download, including Scientific Calculator Plus 991 and Scientific Calculator fx-991.
Scientific Calculator Plus 991 shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 249+ scientific calculator plus 991 apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
NCalc is a comprehensive scientific calculator that includes a graphing module, a large formula library, and a unit and currency converter. It is designed to assist students, engineers, and math enthusiasts with a wide range of mathematical tasks.
Key features include a natural display for entering expressions as they appear in textbooks, a graphing module similar to popular graphing calculators, advanced tools for algebra, calculus, matrices, and statistics, and a built-in unit and currency converter. It also supports multiple number bases and provides a calculation history.