# fxIntegrator

> Mathematical tool for approximating integrals with a natural expression editor. (iPhone/iPad app by JUAN CARLOS ESPANA GALVAN.)

- Source: https://appshunter.io/ios/app/fxintegrator/id375694881 (this page in markdown: same URL + `.md`)
- Developer: [JUAN CARLOS ESPANA GALVAN](https://appshunter.io/developer/326085003)
- Category: Education, Utilities
- Price: $0.99
- Rating: 2.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.3 · 2 MB
- Languages: English
- Released: 2010-06-07
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/fxintegrator/id375694881/reviews.md

## What is fxIntegrator?

Approximation of integrals, made easy.
Considered one of the TOP 50 IPAD APPS at http://www.top10onlineuniversities.org/top-50-ipad-apps-for-e-learners.html

FxIntegrator is a mathematical tool that evaluates the area under a function curve for a given interval. It's extremely handy for math students or engineers who need to calculate integrals using an iPad or iPhone.
Unlike other calculators, its elegant function editor makes it possible to write expressions in natural mathematical notation. It's a dream come true.

FEATURES
 * Natural expression editor: write your functions just like they appear in math textbooks.
 * Finite or infinite boundaries: compute improper integrals just as easily as proper integrals.
 * Adaptive approximation: get results faster for most functions while maintaining accuracy for difficult functions.
* Built-in functions supported: acos, acosh, asin, asinh, atan, atanh, cos, cosh, ln, log, sin, sinh, tan, tanh, square root, absolute value.

fxIntegrator was officially recommended by Utrecht University: http://www.uu.nl/university/library/NL/informatie/tablets/Pages/default.aspx

fxIntegrator was considered an excellent teaching tool by the University of British Columbia: http://wiki.ubc.ca/Course%3aETEC522/sept2011/Ipads

REVIEWS
http://www.walkingrandomly.com/?p=2692
http://www.fleischer.se/blogg/2010/12/01/undervisar-du-i-matematik-har-ar-ipad-apparna-for-dig/

## Key features

- Natural expression editor
- Finite or infinite boundaries
- Adaptive approximation
- Built-in mathematical functions
- Evaluates area under function curve

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/fxintegrator/id375694881/reviews.md

### 3/5 — Definite Integrals only….

*2013-04-07, version 1.28*

I had hoped that this would have a CAS component, so that if I told it to integrate cosxdx it would reply sin x + C, but it will not do indefinite integrals.   Hopefully the authors will include a CAS in later upgrades.

### 4/5 — A great start!

*2010-07-14, version 0*

This calculus app is a great beginning. Very straightforward and uncluttered. I think many student will benefit from this calculator. It would be an educational improvement if Chrisoft would also show the solution's steps. Or... Have a way for the solvers to work thru the solution themselves.

## Frequently asked questions about fxIntegrator

### What is fxIntegrator?

fxIntegrator is a mathematical tool designed to approximate the area under a function's curve for a given interval. It's particularly useful for students and professionals needing to calculate integrals.

### How does fxIntegrator handle mathematical expressions?

fxIntegrator features a natural expression editor that allows users to write mathematical expressions in a format similar to how they appear in textbooks, making it intuitive to use.

### Can fxIntegrator calculate improper integrals?

Yes, fxIntegrator supports both finite and infinite boundaries, enabling the computation of improper integrals as easily as proper ones.

### What is the price of fxIntegrator?

fxIntegrator is available for purchase at $0.99. It is a one-time purchase and does not involve subscriptions or in-app purchases.

### What devices does fxIntegrator support?

fxIntegrator is compatible with iPhone, iPad, and iPod touch devices, making it accessible across various Apple mobile platforms.

### How often is fxIntegrator updated?

The latest version, 2.04, was released on June 12, 2021. While updates may not be frequent, the app has been recognized for its educational value by universities.

### What is the age rating for fxIntegrator?

fxIntegrator has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about calculus.

### Does fxIntegrator have ads?

No, fxIntegrator is ad-free. Users can utilize its full functionality without any interruptions from advertisements.

## Version history (last 5 releases)

### 2.04 — 2021-06-12

-Updated for newest iOS versions.

### 2.03 — 2018-04-22

This app has been updated by Apple to display the Apple Watch app icon.

- Cursor keys now have auto-repeat when pressed, making it easier to edit formulas.

### 2.01 — 2017-08-21

- Better detection of non-convergent improper integrals.

### 2.0 — 2017-08-14

- Updated to iOS 10

### 1.28 — 2012-05-08

- added UNDO button in the iPhone version.

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## More apps by JUAN CARLOS ESPANA GALVAN

- [fxPad](https://appshunter.io/ios/app/fxpad/id326085000)
- [GaussPad](https://appshunter.io/ios/app/gausspad/id345292658)

All apps by JUAN CARLOS ESPANA GALVAN: https://appshunter.io/developer/326085003

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*