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Best Scientific Calculator Plus 991 Apps

248+ iOS apps curated and reviewed

4.6 avg rating
19 free apps
Updated July 2026

If you already know Scientific Calculator Plus 991, this is the deeper bench. 248+ scientific calculator plus 991 apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of July 2026.

Compare top Scientific Calculator Plus 991 Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Scientific Calculator Plus 991Scientific Calculator Plus 991Free4.7★ (12K)YesYesAug 2026
2Scientific Calculator fx-991Scientific Calculator fx-991Free4.5★ (381)YesYesAug 2026
3HiPER Scientific CalculatorHiPER Scientific CalculatorFree4.7★ (243)YesYesAug 2026
4Calculate84Calculate84Free4.8★ (52K)YesYesAug 2026
5Calculator #Calculator #Free4.6★ (36K)YesYesAug 2026
6Scientific Calculator FX-991CWScientific Calculator FX-991CWFree——NoJul 2026
7Calculator with History TapeCalculator with History TapeFree4.7★ (3.2K)NoYesAug 2026
8Calculator with History +Calculator with History +Free4.7★ (25K)NoYesAug 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

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(381 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.

HiPER Scientific Calculator#3

HiPER Scientific Calculator by Jindrich Houska

Worth Considering
🔧 Utilities
4.7😊(243 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

Room to Improve

  • 🐛 Keyboard unresponsive at times
  • 🐛 Ads in paid version
  • 🐛 iOS version lacks RPN mode

More Scientific Calculator Plus 991 apps to explore

4
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
5
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
6
Scientific Calculator FX-991CW
Scientific Calculator FX-991CW
Scientific Calculator FX-991CW
by Murad Yaghi
Free
🔧 Utilities
(0)
7
Calculator with History Tape
Calculator with History Tape
Calculator with History Tape
No Ads Calculator with Memory
Free

This app provides a straightforward calculator experience with a comprehensive history log of all your computations. Customize the keyboard, display, and history records to suit your needs. Easily add annotations and titles to past calculations for better organization.

History record functionDisplay input equationAdjustable keyboard size and font
📊 Productivity
(3.2K)
free with in-app purchases
8
Calculator with History +
Calculator with History +
Calculator with History +
No ads & Scientific calculator
Free

This free calculator app offers a fast, ad-free experience with a visual input and calculation history. Customize your experience with various keyboard sounds and colors, and access advanced scientific functions when needed.

Ad-free experienceCalculation historyVisual input
💰 Finance
(25K)
free with in-app purchases
9
Calculator HD Pro Lite
Calculator HD Pro Lite
Calculator HD Pro Lite
Basic & Scientific Calc
Free

This app offers a user-friendly calculator with large buttons and extensive customization options. It features a dual-line display to see input and results simultaneously, saves your calculation history, and provides full scientific functions. Personalize layouts, themes, and even button symbols to suit your needs.

Dual-line displayCalculation historyFull scientific functions
🔧 Utilities
(51K)
ad-supported
10
Calculator : Scientific Calculator & converter
Calculator : Scientific Calculator & converter
Calculator : Scientific Calculator & converter
Scientific Calculator
Free

This app offers a comprehensive scientific calculator with advanced functions for math, finance, and engineering. It includes unit and currency conversion, a constants library, and a biorhythm calculator for daily insights. The interface is intuitive and supports multiple calculation modes.

Scientific calculations (sin, cos, tan, log, etc.)Currency and unit converterConstants library (1500+ constants)
🔧 Utilities
(3)
free
11
Basic Calculator+
Basic Calculator+
Basic Calculator+
Basic Four Function Calculator
Free

Perform essential arithmetic operations with a straightforward calculator app. Its large buttons and clear display ensure ease of use, supporting both portrait and landscape orientations.

Basic four functionsClear displayLarge buttons
🔧 Utilities
(243K)
free with in-app purchases
12
M9 Scientific Calculator Graph
M9 Scientific Calculator Graph
M9 Scientific Calculator Graph
Best Mathematical Calculator
Free
🔧 Utilities
(0)
13
Scientific Calculator fx-991EX
Scientific Calculator fx-991EX
Scientific Calculator fx-991EX
Natural Textbook Calculator
Free
$4.99 | 100% OFF

This academic calculator displays mathematical expressions in natural textbook format, including fractions and roots. It provides exact form results and supports complex numbers, trigonometry, and advanced math functions. Store values in variables and access calculation history.

Natural textbook displayExact form results (fractions, roots, pi)Full complex number support
📚 Education
(2)
free
14
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
15
Basic Calculator with History
Basic Calculator with History
Basic Calculator with History
Simple Calc – Stylish 3D Skins
Free

This app offers a visually engaging calculator experience with realistic 3D button effects and customizable skins. It includes a history feature to review past calculations and a backspace key for easy corrections, all within an ad-free interface.

Elegant 3D design with realistic button effectsCustomizable designer skinsCalculation history for reviewing past entries
🔧 Utilities
(131)
subscription
16
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
17
Grid Calculator.
Grid Calculator.
Grid Calculator.
Basic, Scientific, Plus Calc
Free
📊 Productivity
(0)
18
Calculator 0 - Scientific Calc
Calculator 0 - Scientific Calc
Calculator 0 - Scientific Calc
No ads scientific calculator
Free

This app offers a powerful scientific calculator with a clean interface and no ads. It supports natural writing for formulas, extensive mathematical operations, and a history feature for reviewing past calculations. Customize themes and icons for a personalized experience.

Real-time resultsFormula editing and historyExtensive scientific operations
🔧 Utilities
(4)
free with in-app purchases
19
Scientific Calculator Pro++
Scientific Calculator Pro++
Scientific Calculator Pro++
with Unit Converter & Physical
$2.99
📚 Education
(0)
20
Calculator+..
Calculator+..
Calculator+..
Basic, Scientific, Plus Calc
Free
🌟 Lifestyle
(0)

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 July 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 July 2026.
We track 248+ scientific calculator plus 991 apps on the iOS App Store as of July 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.