Scientific Calculator Plus 991

Scientific Calculator Plus 991

NCalc & CalcES Calculator 115

13K ratings
509 reviews
Free
In-App PurchasesWith Ads

Details

Released
April 3, 2019
Updated
October 22, 2026

Features

Scientific Calculator Plus 991 screenshot #1 for iPhone
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Scientific Calculator Plus 991 screenshot #8 for iPhone
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About

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.

✓Natural display input
✓Graphing module
✓Formula library
✓Unit and currency converter
✓Algebra and calculus tools
✓Matrix and vector operations
✓Statistical calculations
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What users say about Scientific Calculator Plus 991

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What's New in Scientific Calculator Plus 991

3.6.6

October 22, 2026

- Customise key sounds, volume and vibration, and choose separate fonts for the keyboard and display. - Equation solver: find more roots and view equations and inequalities on a graph. - Camera: frame and zoom in on an expression, with the photo kept visible during recognition. - Preview Normal, FIX, SCI and ENG formats and choose how many digits to show. - History keeps your BASE-N and SOLVE calculations. - Matching brackets are highlighted and grow to fit fractions. Tap the display arrows to scroll long expressions. - Browse 47 scientific constants by category in CONST. - Fixed the order of user-defined functions after rearranging them.

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Subscriptions & In-App Purchases

Calculator yearly subscription

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$3.991 Year
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User reviews

Still the best

I’ve been using Duy Tran’s calculator apps for a few years now. Absolutely fantastic apps. They work in a completely familiar way and can sit comfortably on Mac desktop, iPadOS and iPhone. Great to have proper scientific calculators on hand without needing a separate device!

Outstanding calculator

So easy to enter problems

Hervorragend

Mit Abstand der beste Taschenrechner für die Hosentasche!

Ich nutze die App seit 3 Jahren gerne und sie ist nach jedem Update sogar noch besser geworden. Die Vollversion lohnt sich, der Entwickler gibt sich wirklich Mühe und das merkt man auch.

Ein Muss für die Baustelle oder im Ingenieursstudium. Schnell, übersichtlich und viele Design Optionen. Teilweise nutze ich die App beim Lernen, wegen den praktischen Grafiken, sogar lieber als meinen Uni Taschenrechner.
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Convert

I’m a seasoned electrical engineer having spent my career using RPN. RPN is efficient for simple calculations but the breadth of capability using NCALC has me excited to learn other ways to solve circuit issues. There is nothing the tool can’t conquer with some work and devotion. I’ve owned NCALC for a few years and hoped a few YouTube videos would suffice. I was wrong. Fortunately, the manual is excellent and as I take on more tasks to uncover, the possibilities keep revealing themselves. It’s very well done and that it works on so many Apple devices allows the circumstances of life to not keep from reaching for it. Thanks to the design and quality team for making this tool available.
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Simply put, the best calculator I’ve ever had!

I was always fascinated by what calculators could offer, and even though I had in the past some quite capable ones, NCalc is just the best of them all, the simplest and most intuitive to use, and the one with the most attention to detail on its user interface I’ve seen so far!

Developer apps

User experience

🐞

Reported Bugs

3 issues

Keyboard input stops working after switching screens

Bug

Incorrect calculation results for certain operations

Bug

App crashes on some devices after recent update

Bug
✨

Requested Features

5 requests

Add option to change display font and color

Feature

Improve cursor control and editing capabilities

Feature

Implement auto-simplification for complex expressions

Feature

Add more handwriting font options

Feature

Expand graphing and equation solving features

Feature

FAQ

What does NCalc Scientific Calculator + do?

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.

What are the key features of this calculator app?

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.

Is NCalc Scientific Calculator + free to use?

The application is available for free download and use, but it does contain in-app purchases. This means that while the core functionality is accessible, certain advanced features or content may require a purchase to unlock.

Who is the target audience for NCalc Scientific Calculator +?

This app is primarily designed for students, engineers, and anyone with a strong interest in mathematics. Its extensive features cater to users who require advanced calculation, graphing, and problem-solving capabilities for academic or professional purposes.

What kind of math problems can this app solve?

The app can handle a wide array of mathematical problems, including algebraic manipulations (expansion, factorization), calculus operations (derivatives, integrals, limits), solving various types of equations and inequalities, matrix and vector operations, and statistical calculations. It also supports complex number arithmetic and number base conversions.