Best Casio Calculator Apps

250+ iOS apps curated and reviewed

4.5 avg rating
20 free apps
Updated August 2026

Scientific Calculator fx is the household name in casio calculator, but it's far from the only option. We track 250+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Casio Calculator Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Scientific Calculator fx-991Scientific Calculator fx-991Free4.5★ (381)YesYesAug 2026
2Scientific Calculator Plus 991Scientific Calculator Plus 991Free4.7★ (12K)YesYesAug 2026
3ClassWiz Calc App QRClassWiz Calc App QRFree2.1★ (8)YesYesAug 2026
4Calculator #Calculator #Free4.6★ (36K)YesYesAug 2026
5HiPER Scientific CalculatorHiPER Scientific CalculatorFree4.7★ (243)YesYesAug 2026
6Calculator₊Calculator₊Free4.7★ (1.7M)YesYesAug 2026
7Calculate84Calculate84Free4.8★ (52K)YesYesAug 2026
8Scientific Calculator - CalScientific Calculator - CalFree5.0★ (1)YesYesAug 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
4.5(391 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.

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

Room to Improve

  • 🐛 Occasional bugs and input issues
  • 🔀 Confusing layout and button placement
  • 💰 Some advanced features locked behind paywall
ClassWiz Calc App QR#3

ClassWiz Calc App QR by CASIO COMPUTER CO., LTD.

Worth Considering
📚 Education
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

4
Calculator #
Calculator #
Calculator #
Scientific Calculator
Free

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.

Math Photos SolverHandwriting RecognitionAI Math Problem Solver
🔧 Utilities
(36K)
free with in-app purchases
5
HiPER Scientific Calculator
HiPER Scientific Calculator
HiPER Scientific Calculator
by Jindrich Houska
Free

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.

Symbolic algebraIntegrals and derivativesHigh precision calculations
🔧 Utilities
(243)
free with in-app purchases
6
Calculator₊
Calculator₊
Calculator₊
Basic, Scientific, Plus Calc
Free

This app offers a comprehensive suite of calculation tools, including basic, scientific, and unit conversion functions. It features an AI-powered math solver that can solve problems from photos and a dedicated math notes section for jotting down equations and diagrams. Accessibility options like dynamic text size and VoiceOver support are also included.

Basic and scientific calculationsUnit and currency converterAI-powered math solver with photo recognition
🔧 Utilities
(1.7M)
free with in-app purchases
7
Calculate84
Calculate84
Calculate84
Intended for use with TI-84
Free

This app offers a modern graphing calculator experience on your iPhone. It features fast, interactive touch-screen graphing, scrollable windows, and intelligent error messages for a more intuitive user experience. Designed to be a usable alternative to physical graphing calculators.

Fast, interactive touch-screen graphingScrollable windowsIntelligent error messages
📚 Education
(52K)
free with in-app purchases
8
Scientific Calculator - Cal
Scientific Calculator - Cal
Scientific Calculator - Cal
A Better Scientific Calculator
Free

Perform complex calculations with a natural input interface. This app offers instant results in both number and expression formats, supporting a wide range of mathematical functions. Enjoy a clean design with customizable options and offline availability.

Natural input expression entryInstant calculation resultsNumber and expression format display
🔧 Utilities
(1)
free with in-app purchases
9
Citizen Calculator App
Citizen Calculator App
Citizen Calculator App
The Calculator: GST Calculator
Free

This app offers a comprehensive calculator with standard arithmetic functions, business-specific calculations like GST, and advanced features. Enjoy a realistic calculator experience with tactile feedback and a clean interface.

GST CalculatorBasic math operationsBusiness and financial functions (M+, M-, MU, GT)
🔧 Utilities
(340)
freemium
10
Simple Calculator.
Simple Calculator.
Simple Calculator.
Basic Casio-style calculator
Free

A straightforward calculator designed for speed and accuracy, mimicking classic pocket calculators. It offers real-world logic, business-focused calculations like cost, sell, and margin, and a clean interface for effortless use.

Real-world logic, no forced order of operationsRunning total displayCost, sell, margin calculations
🔧 Utilities
(1.6K)
ad-supported
11
Panecal Scientific Calculator
Panecal Scientific Calculator
Panecal Scientific Calculator
For engineers and students
Free

This app functions as a scientific calculator, enabling users to input and edit complex formulas with ease. It supports formula history, variable memory, and various number system conversions for accurate calculations.

Formula editing with cursor and swipeReuse past formulasVariable memory for calculations
🔧 Utilities
(1.9K)
ad-supported
12
Nova Calc: Smart Calculator
Nova Calc: Smart Calculator
Nova Calc: Smart Calculator
Clean, Fast & No Ads
Free
🔧 Utilities
(0)
13
Desmos Graphing Calculator
Desmos Graphing Calculator
Desmos Graphing Calculator
by Desmos
Free

Explore mathematical concepts by graphing any equation, from simple lines to complex series. This powerful tool allows for interactive exploration with sliders, data tables, and animations. It also includes a scientific calculator and supports inequalities and accessibility features.

Graph any equation (polar, cartesian, parametric)Interactive sliders for function transformationsInput and plot data with tables
📚 Education
(1.3K)
free
14
Calculator∫
Calculator∫
Calculator∫
by 7th Gear
Free

Perform calculations quickly and accurately with large buttons. Personalize the interface by selecting custom background and text colors. This straightforward utility is designed for intuitive use.

Large buttons for easy inputAccurate calculationsCustomizable background colors
🔧 Utilities
(7)
free
15
Calciq - Smart Calculator
Calciq - Smart Calculator
Calciq - Smart Calculator
Smart calculator for everyday
Free

This app allows you to perform calculations by simply typing questions in plain English, without needing to select modes. It handles everyday math, finance, developer calculations, and scientific functions, acting as a running scratchpad for continuous calculations. It also offers live currency conversion and can fall back to AI for complex queries.

Natural language inputAutomatic mode detectionRunning scratchpad functionality
🔧 Utilities
(2)
free
16
All-in-One Calculator Tools
All-in-One Calculator Tools
All-in-One Calculator Tools
40+ calculators for daily use
Free
📊 Productivity
(0)
17
Calculator for iPhone and iPad
Calculator for iPhone and iPad
Calculator for iPhone and iPad
You can count on it
Free

A straightforward and intuitive calculator app designed for ease of use. It offers a history bar, customizable themes, and advanced mathematical functions, ensuring a pleasant and efficient calculation experience on your device.

Basic arithmetic operationsAdvanced scientific functionsHistory bar for past calculations
🔧 Utilities
(15K)
free with in-app purchases
18
This is Calculator
This is Calculator
This is Calculator
Basic calculator without ads
Free

A straightforward calculator app with a clean interface. It allows users to add simple notes to calculation results and easily copy or paste them from the history. This app is designed for quick and ad-free calculations.

Ad-free experienceSimple layoutHistory with notes
📊 Productivity
(14)
free
19
CalculatorRed
CalculatorRed
CalculatorRed
Calculator for iPad & iPhone
Free
🔧 Utilities
(0)
20
Calculator X: Math for iPad
Calculator X: Math for iPad
Calculator X: Math for iPad
Smart History, Plus Scientific
Free

This app offers a smart calculator experience across iPad, iPhone, and Apple Watch. It features a history of calculations, the ability to edit equations, and a convenient dark mode. Easily share your results and enjoy enhanced productivity with its user-friendly interface.

Basic & Easy to UseHistory of CalculationsEdit Equation
💰 Finance
(6.2K)
free with in-app purchases

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 August 2026, with a 4.5-star average from 381 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 August 2026.
We track 250+ casio calculator apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This app functions as a powerful scientific calculator designed to help users solve math and science problems. It offers step-by-step solutions for equations, advanced mathematical functions, interactive graphing, an extensive formula library, and a unit converter.
Key features include a step-by-step equation solver, advanced scientific functions for algebra and calculus, a graphing mode to visualize functions, a comprehensive formula library for math, physics, and chemistry, and a unit converter. It also boasts an interface inspired by the Casio fx-991.