Best Casio Calculator Apps

249+ iOS apps curated and reviewed

4.4 avg rating
19 free apps
Updated September 2026

Scientific Calculator Plus 991 is the household name in casio calculator, but it's far from the only option. We track 249+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Casio Calculator Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Scientific Calculator Plus 991Scientific Calculator Plus 991Free4.7★ (12K)YesYesSep 2026
2Calculator #Calculator #Free4.6★ (36K)YesYesSep 2026
3HiPER Scientific CalculatorHiPER Scientific CalculatorFree4.7★ (256)YesYesSep 2026
4Citizen Calculator AppCitizen Calculator AppFree4.7★ (340)NoYesSep 2026
5Simple Calculator.Simple Calculator.Free4.6★ (1.6K)YesNoSep 2026
6Calctic - Calculator ++Calctic - Calculator ++FreeNoNoMay 2026
7CMCalcCMCalcFree4.5★ (6)NoNoSep 2026
8Calculator Ultra: Smart MathCalculator Ultra: Smart MathFreeNoAug 2026

Top Picks for Casio Calculator

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
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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
Calculator ##2

Calculator # by Incpt.Mobis

Scientific Calculator
Strong Contender
🔧 Utilities
4.6😐(36K ratings)
FreeAdsIn-App Purchases
Calculator # screenshot 1
Calculator # screenshot 2
Calculator # screenshot 3
Calculator # screenshot 4
Calculator # screenshot 5
Calculator # screenshot 6

This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.

What We Love

  • 👍 Easy to use
  • 🚀 Powerful functionality
  • 💡 Helpful for math classes
  • ⭐ Great for students
  • 👌 Works like a real calculator

Room to Improve

  • 🔍 Confusing interface after update
  • 📢 Too many intrusive ads
  • 💰 Paywall for advanced features
  • 🐛 Incorrect calculations
  • 🔇 Loud audio ads
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 Casio Calculator apps to explore

FAQ about Casio Calculator

What are the best casio calculator apps for iPhone?
Scientific Calculator Plus 991 tops our casio calculator 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 casio calculator apps we rank are free to download, including Scientific Calculator Plus 991 and Calculator #.
Scientific Calculator Plus 991 shows ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 249+ casio calculator 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.