# geoTools — Earth's Gravity and Magnetics

> Geophysical and geographic tools for Earth science professionals and enthusiasts. (iPhone/iPad app by Andre Molina.)

- Source: https://appshunter.io/ios/app/geotools/id591458160 (this page in markdown: same URL + `.md`)
- Developer: [Andre Molina](https://appshunter.io/developer/503002385)
- Category: Utilities, Business
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.1 · 17 MB
- Languages: American English, European Portuguese
- Released: 2013-04-22
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/geotools/id591458160/reviews.md

## What is geoTools?

geoTools is a set of tools to use in geologic, geophysical, engineering and geographic work. It includes the estimation of important geophysical quantities, such as Bouguer anomaly, topography, magnetic declination, and so on, and a quick coordinate converter. The ideal companion for a geologist, a geophysicist,  an engineer, a geographer, and to any person interested in the Earth Sciences.

The easiest and more effective way to calculate the parameters associated to the Earth's gravity field and magnetic field. 

Convert coordinates from geographic to Universal Transverse Mercator and vice-versa with one touch, using different reference systems.

Since 2018 the app uses the new IGRF geomagnetic model to estimate the magnetic parameters. All the tests we've made show very good results.

PLEASE NOTICE: geoTools is free, no ads, no purchases, absolutely free! If you use it, please let a review to help us keep upgrading the app. It is simple, fast, and very important to us!

## Key features

- Estimate geophysical quantities
- Calculate Bouguer anomaly
- Estimate magnetic declination
- Quick coordinate converter
- Geographic to UTM conversion
- UTM to geographic conversion
- Uses IGRF geomagnetic model

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/geotools/id591458160/reviews.md

### 5/5 — FANTASTIC

*2015-01-25*

I've been looking for a program like this for years! This app should have been done while I was in the University, my life would be much more easy with all those gravity calculations, and that devilish coordinate transforms could be done with one touch!
An essential app for all those people who works with geology, geophysics, engineering, cartography and geography.

### 5/5 — GREAT

*2015-01-25*

This is a really great app! I use it constantly in my work, and the results are very reliable. Easy to handle, it is perfect for my engineering tasks.

**Developer response:** Thanks for your nice comments, Ograo! Best regards.

## Frequently asked questions about geoTools

### What is geoTools used for?

geoTools is a set of tools designed for geologic, geophysical, engineering, and geographic work. It helps estimate geophysical quantities like Bouguer anomaly and magnetic declination, and includes a quick coordinate converter.

### Who is geoTools for?

geoTools is ideal for geologists, geophysicists, engineers, geographers, and anyone interested in Earth Sciences who needs to calculate parameters related to the Earth's gravity and magnetic fields.

### Does geoTools have ads?

No, geoTools is completely free, with no ads and no in-app purchases.

### What coordinate systems can geoTools convert between?

geoTools can convert coordinates from geographic to Universal Transverse Mercator (UTM) and vice-versa, supporting different reference systems.

### How accurate is geoTools' magnetic field estimation?

Since 2018, geoTools uses the new IGRF geomagnetic model for magnetic parameter estimation. Tests have shown very good results with this model.

### On what devices can I use geoTools?

geoTools is available for iPhone and iPod devices.

### When was geoTools last updated?

The latest version of geoTools, 1.2, was last updated on January 23, 2018.

### What is the age rating for geoTools?

geoTools has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 3 releases)

### 1.2 — 2018-01-23

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

We've updated the geomagnetic values using the International Geomagnetic Reference Field (IGRF-12), and we've made some adjustments in the layout. Your favorite app now is faster and improved. Enjoy, and please, write a review! It is very important to us. :)

### 1.1 — 2015-01-24

The app was revamped for use with iPhone 4S, iPhone5 (all types) and iPhone6/iPhone6 Plus.

The new magnetic model WMM 2015 is used for the calculations of the geomagnetic parameters.

Some typos and small fixes were done.

### 1.0 — 2013-04-22

No release notes.

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## More apps by Andre Molina

- [Magnetic Storms](https://appshunter.io/ios/app/magnetic-storms/id575956246)
- [Lynx Eyes](https://appshunter.io/ios/app/lynx-eyes/id860510971)
- [Geophysics made easy](https://appshunter.io/ios/app/geophysics-made-easy/id1517402165)
- [Vamos ao dentista?](https://appshunter.io/ios/app/vamos-ao-dentista/id1551226471)
- [Crazy Spot It](https://appshunter.io/ios/app/crazy-spot-it/id6479363812)

All apps by Andre Molina: https://appshunter.io/developer/503002385

## Related topics

[magnetic declination](https://appshunter.io/ios/topics/magnetic-declination)

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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 2026-06-05.*