Best Casio Calculator Apps

249+ iOS apps curated and reviewed

4.5 avg rating
20 free apps
Updated October 2026

Scientific Calculator fx 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 (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Scientific Calculator fx-991Scientific Calculator fx-991Free4.6★ (415)YesYesOct 2026
2Scientific Calculator Plus 991Scientific Calculator Plus 991Free4.7★ (12K)YesYesOct 2026
3ClassWiz Calc App QRClassWiz Calc App QRFree2.1★ (8)YesYesOct 2026
4Calculator₊Calculator₊Free4.7★ (1.7M)YesYesOct 2026
5Calculator #Calculator #Free4.6★ (36K)YesYesOct 2026
6Calculate84Calculate84Free4.8★ (53K)YesYesOct 2026
7HiPER Scientific CalculatorHiPER Scientific CalculatorFree4.7★ (268)YesYesOct 2026
8Citizen Calculator AppCitizen Calculator AppFree4.7★ (340)NoYesOct 2026

Top Picks for Casio Calculator

Scientific Calculator fx-991#1

Scientific Calculator fx-991 by Dinh Phuc

Step-by-step Math Solver
Editor's Choice
📚 Education
4.6😊(415 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
Scientific Calculator Plus 991#2

Scientific Calculator Plus 991 by Tran Duy

NCalc & CalcES Calculator 115
Strong Contender
📚 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
2.1(8 ratings)
FreeAdsIn-App Purchases
ClassWiz Calc App QR screenshot 1
ClassWiz Calc App QR screenshot 2
ClassWiz Calc App QR screenshot 3
ClassWiz Calc App QR screenshot 4
ClassWiz Calc App QR screenshot 5
ClassWiz Calc App QR screenshot 6

This app brings the functionality of Casio's ClassWiz scientific calculators to your smartphone or tablet. Perform advanced calculations, manage spreadsheets, and generate graphs by connecting to Casio's online services. It mirrors the operation of physical calculators and uses QR codes for seamless integration.

More Casio Calculator apps to explore

FAQ about Casio Calculator

What are the best casio calculator apps for iPhone?
Scientific Calculator fx-991 tops our casio calculator apps ranking as of October 2026, with a 4.6-star average from 415 App Store ratings, and it's free to download.
Yes — 20 of the top casio calculator apps we rank are free to download, including Scientific Calculator fx-991 and Scientific Calculator Plus 991.
Scientific Calculator fx-991 shows ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 249+ casio calculator apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.