# GCTools — The geocaching tool collection

> Geocaching tools for multi and mystery caches, including coordinate manipulation and ciphers. (iPhone/iPad app by Achim Heynen.)

- Source: https://appshunter.io/ios/app/gctools/id438313105 (this page in markdown: same URL + `.md`)
- Developer: [Achim Heynen](https://appshunter.io/developer/374870201)
- Category: Utilities, Navigation
- Price: Free with in-app purchases
- Rating: 3.10/5 from 13 App Store ratings · 30 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.2 · 41 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2011-05-27
- Data updated: 2026-06-09
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/gctools/id438313105/reviews.md

## What is GCTools?

GCTools - the geocaching tool collection!

Here you find the tools to get your next multi and mystery caches done easily.

Coordinates:
- Target guidance
- Projection of coordinates
- Distance between coordinates
- Intersection of lines
- Intersection of circles
- Intersection of line/circle
- Center of circle
- Coordinate conversion (DMS, DM, D, Lat/Lon, UTM, MGRS, Swiss Grid, Quadtree)
- Saving/loading coordinates (inApp)
- Mapview
- Interface to GoogleMaps, GoogleEarth, OpenMaps, OffMaps, Navigon, TomTom, Pocket Earth and Waze

Ciphers De-/Encoding:
- Affine Cipher
- Alpha Cipher 
- Bacon Code
- Baudot Code (CCITT-2)
- Braille Alphabet
- Caesar Cipher (ROT-N), ROT-5, -13, -18, -47
- Finger Alphabet
- Flag Alphabet
- Pigpen/Freemason's Cipher
- Hexahue Code
- Mobile Cipher
- Morse Code
- Puzzle-Code
- Semaphore Alphabet
- Shutter Telegraph
- Tomtom Code
- Vigenere Cipher/One Time Pad
- Custom alphabets
- Saving/loading alphabets (inApp)

Interactive data tables:
- Cross Sum
- Latin/Arabic Numbers
- Maya Numbers
- Resistors
- Periodic system
- Color Alphabet
- Prime Numbers
- PI Digits
- ASCII Code
- Binary Code
- German Police Codes

Converters:
- Coordinates
- ASCII/Number Systems
- Lengths
- Areas
- Volumes
- Masses
- Angles
- Speeds
- Times
- Pressures
- Temperatures
- Angles
- Number systems 
- Data sizes

- Flashlight
- Menu favorites and search

If you find something missing let us know!

If you encounter problems with the app please mail to gctools@onedollarapp.com instead of writing a review here. We cannot contact you that way to find a solution.

## Key features

- Coordinate projection and distance calculation
- Extensive cipher decoding and encoding
- Interactive data tables
- Multiple unit converters
- Mapview integration with popular services
- Coordinate saving and loading

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Coordinate Storage | $0.99 | one-time |
| Circle Tools | $0.99 | one-time |
| Advanced Alphabets | $0.99 | one-time |
| Vigenere/One Time Pad Cipher | $0.99 | one-time |
| Coordinate Types | $0.99 | one-time |
| Full Version | $2.99 | one-time |
| 1 Year Full Version | $1.99 | one-time |


## Recent user reviews (10 of 30)

All indexed reviews: https://appshunter.io/ios/app/gctools/id438313105/reviews.md

### 5/5 — Useful

*2024-08-18*

GCTools is a very helpful app that makes puzzle solving on a mobile device much easier.

### 4/5 — Very useful and works well for me

*2021-07-07, version 3.4.5*

Nice app with lots of features that are useful.

### 5/5 — Awesome Tool

*2017-11-11, version 3.0.1*

What’s with a a “1”??
I find this App an incredible tool for getting values and doing useful calculations. Been using it for years.

### 1/5 — Nice update

*2017-11-01, version 3.0.0*

Been a user for years, nice to see this get updated.

### 1/5 — Useless

*2017-08-06, version 2.2.3*

Can't read the numbers.

### 1/5 — Used to be great

*2017-05-28, version 2.2.3*

I used this all the time but lately it hasn't worked at all. Nothing in the code section works at all. Such a shame. Sent them an email waiting on a response.

### 1/5 — Don't bother

*2017-02-15, version 2.2.3*

It deserves a zero because it does not work.

### 1/5 — Don't get it

*2016-06-13, version 2.2.3*

This app doesn't even work.

### 1/5 — Don't buy

*2015-10-22, version 2.2.3*

Doesn't work

### 1/5 — Bad app

*2014-05-16, version 2.2.1*

Does not calculate coordinate conversions correctly. Poorly built for the in app purchases, be warned.

## Frequently asked questions about GCTools

### What does GCTools do?

GCTools is a collection of tools designed to assist geocachers, particularly with multi and mystery caches. It offers features for coordinate manipulation, a wide variety of cipher decoding and encoding, interactive data tables, and numerous unit converters.

### What are the key features of GCTools?

Key features include target guidance and projection of coordinates, distance calculation between coordinates, intersection calculations, and a comprehensive list of coordinate conversions. It also supports numerous ciphers like Caesar, Vigenere, and Morse code, along with interactive data tables and unit converters for length, area, mass, and more.

### Is GCTools free to use?

The app is free to download and use, but it offers in-app purchases for certain features such as saving and loading coordinates and alphabets. This allows users to access core functionalities for free while offering advanced options for those who need them.

### What kind of geocaching puzzles can GCTools help with?

This app is specifically designed to help with multi and mystery caches. Its coordinate manipulation tools are useful for calculating new waypoints or understanding complex coordinate puzzles. The extensive cipher tools can decode messages hidden within caches, and the data tables can assist with number-based puzzles.

### What platforms is GCTools compatible with?

The description does not explicitly state the compatible platforms (e.g., iOS, Android). However, it mentions interfaces with Google Maps, Google Earth, Navigon, TomTom, and Waze, suggesting it is likely a mobile application available on common smartphone operating systems.

## Version history (last 5 releases)

### 3.4.5 — 2020-04-29

New in version 3.4.5:
- Fixed a potential crash when opening "Distance between Coordinates"

Version 3.4.4 brings:
- New feature to calculate a specific point between two points (Belongs to "Distance between coordinates")
- French translation!
- Fix of wrong units in map view
- Changed line color for target heading in map view
- Improved input handling for utm and ch1903 coordinates
- Some UI improvements

### 3.4.4 — 2020-04-21

Version 3.4.4 brings:
- New feature to calculate a specific point between two points (Belongs to "Distance between coordinates")
- French translation!
- Fix of wrong units in map view
- Changed line color for target heading in map view
- Improved input handling for utm and ch1903 coordinates
- Some UI improvements

### 3.4.3 — 2020-03-19

Release 3.4.3 fixes a problem with saved coordinates and alphabets. Unfortunately users that already startet 3.4.2 will probably not recover their saved data. We apologize for the inconvenience :(

Release 3.4.2 contains smaller changes:
- improved calculation for center of circle
- configurable order and visibility of converter items
- selection of used language in iOS-settings
- some minor bug fixes and UI improvements

### 3.4.2 — 2020-03-14

Release 3.4.2 contains smaller changes:
- improved calculation for center of circle
- configurable order and visibility of converter items
- selection of used language in iOS-settings
- some minor bugs and UI improvements

### 3.4.1 — 2019-01-11

- The coordinate parser has been improved and supports more formats, e.g. the coordinate format used by cach.ly
- Wrong decimal formatting was fixed for some coordinate types
- TomTom-Code and Bacon-Code support copy & paste for encoded texts
- Better support for larger fonts

## Apps similar to GCTools

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Abfall-App BB](https://appshunter.io/ios/app/abfall-app-bb/id1050995487) | — | Free | Utilities |
| [Hörmann homee](https://appshunter.io/ios/app/hormann-homee/id1512912959) | 3.3 (15) | Free | Utilities |
| [Morse Master Lite](https://appshunter.io/ios/app/morse-master-lite/id663706307) | 2.7 (6) | Free | Utilities |
| [Bandwidth Monitor](https://appshunter.io/ios/app/bandwidth-monitor/id1028845085) | 1.7 (9) | Free | Utilities |
| [Where Am I? - Locality Info](https://appshunter.io/ios/app/where-am-i-locality-info/id1488079110) | 4.8 (33) | Free | Utilities |
| [NINA](https://appshunter.io/ios/app/nina/id949360949) | 2.3 (12) | Free | Utilities |

## More apps by Achim Heynen

- [ColorPicker](https://appshunter.io/ios/app/colorpicker/id422625345)
- [GCTools iOS4 - the geocaching tool collection for iOS 4!](https://appshunter.io/ios/app/gctools-ios4-the-geocaching-tool-collection-for-ios-4/id591678358)

All apps by Achim Heynen: https://appshunter.io/developer/374870201

## Related topics

[gctools](https://appshunter.io/ios/topics/gctools) · [geocaching toolkit igct](https://appshunter.io/ios/topics/geocaching-toolkit-igct)

---

*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 2026-06-09.*