# Scientific Calculator Plus 991

> NCalc & CalcES Calculator 115

Canonical page: [https://chrome-stats.com/d/id1449106995](https://chrome-stats.com/d/id1449106995)

## Overview

- **ID:** `id1449106995`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Tran Duy
- **Category:** Education
- **Rating:** 4.70 / 5 (12,432 ratings)
- **Version:** 3.6.1
- **Last updated:** 2026-06-25
- **First published:** 2019-04-03
- **Size:** 176 MB
- **Data as of:** 2026-09-22
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/scientific-calculator-plus-991/id1449106995)
- **Website:** [https://ncalc-app.web.app](https://ncalc-app.web.app/)
- **Privacy policy:** [https://ncalc-app.web.app/privacy-policy.html](https://ncalc-app.web.app/privacy-policy.html)

## Description

Scientific Calculator Plus 991 delivers NCalc and CalcES capabilities in a natural-display scientific calculator with graphing, a comprehensive formula library, and a unit/currency converter. It fuses algebra, calculus, complex numbers, and equation solving with a full graphing module (83/84-style) to help students and engineers work faster and more accurately.

Key features include exact fractions and decimals, multiple angle units, matrix operations, statistics and distributions, base-N arithmetic, tables, variables, user-defined functions, built-in constants, and a broad math-physics formula catalog. With history, copy/paste, and flexible output formats, it’s designed for learning, quick reference, and reliable problem solving.

## Rankings

- #15,693 — Overall
- #12 — calculator

## Review summary

Users praise its deep feature set and reliability, making it a top choice for math, engineering, and everyday use. While the app is highly capable and easy to use, several reviews cite performance issues such as input lag and occasional freezes. Overall, it's seen as a powerful, versatile calculator across Mac, iPad, and iPhone.

### Pros

- Feature-rich and versatile: CAS, constants, built-in formulas, tutorials, and units conversion.
- Highly reliable and well-regarded, with long-term satisfaction and frequent praise as one of the best calculators.
- User-friendly design: large font, clear input, and a non-intrusive buying prompt.
- Cross-device availability: performs well on Mac, iPad, and iPhone with a consistent experience.

### Cons

- Performance issues: noticeable lag in basic calculations and occasional typing freezes.

## Similar extensions and apps

- [Natural Scientific Calculator](https://chrome-stats.com/d/id1221737584) — 4.60 / 5
- [Scientific Calculator fx-991EX](https://chrome-stats.com/d/id6760968561) — 2.60 / 5
- [Graphing Calculator Plus AI](https://chrome-stats.com/d/id1279565050) — 4.60 / 5
- [EduCalc Classic](https://chrome-stats.com/d/id378009553) — 3.90 / 5
- [Super Calc Pro+](https://chrome-stats.com/d/id6761375071)
- [Calculator : Scientific Calculator & converter](https://chrome-stats.com/d/id1267774163) — 5.00 / 5
- [CalcletPlus](https://chrome-stats.com/d/id6744940625)
- [Numerari Scientific Calculator](https://chrome-stats.com/d/id572743089) — 5.00 / 5
- [▸ Calculator +](https://chrome-stats.com/d/id473884845) — 4.70 / 5
- [Scientific Calculator \*](https://chrome-stats.com/d/id1537346972) — 4.60 / 5
- [CalcPro - Scientific Calc Pro](https://chrome-stats.com/d/id6760207484)
- [Calculate: Advanced Calculator](https://chrome-stats.com/d/id389777495) — 3.90 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id1449106995)