# GCTools

> The geocaching tool collection

Canonical page: [https://chrome-stats.com/d/id438313105](https://chrome-stats.com/d/id438313105)

## Overview

- **ID:** `id438313105`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Achim Heynen
- **Category:** Utilities
- **Rating:** 3.10 / 5 (13 ratings)
- **Version:** 3.4.5
- **Last updated:** 2020-04-29
- **First published:** 2011-05-27
- **Size:** 41 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gctools/id438313105)
- **Website:** [http://gctools.onedollarapp.com](http://gctools.onedollarapp.com/)
- **Privacy policy:** [http://www.onedollarapp.com/gctools/privacy/](http://www.onedollarapp.com/gctools/privacy/)

## Description

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.

## Rankings

- #349,172 — Overall

## Review summary

Users praise GCTools for its powerful calculations, regular updates, offline data access, and all-in-one puzzle caching utility, especially useful in the field. However, many reviews report stability problems (crashes, launches failures), coordinate input and conversion glitches, readability issues, and concerns about paid features and data accuracy.

### Pros

- Powerful calculator/tool for values and calculations
- Updated and maintained over years
- Offline database and quick reference for field use
- All-in-one tool for puzzle caching
- Handy in the field with quick access to information

### Cons

- Frequent reliability issues: app not functioning, crashes, black screen after upgrade
- Coordinate input/conversion glitches: numbers change when entering coordinates; incorrect conversions
- Readability issues: numbers are hard or impossible to read in certain views
- Paywall / limited free functionality and problematic in-app purchases
- Data quality issues: spelling errors and incorrect data such as element names

## Similar extensions and apps

- [GCTools iOS4 - the geocaching tool collection for iOS 4!](https://chrome-stats.com/d/id591678358) — 2.80 / 5
- [Geocaching Tools Kit](https://chrome-stats.com/d/id593639170) — 4.00 / 5
- [CacheToolBox](https://chrome-stats.com/d/id558528399) — 5.00 / 5
- [Geocaching Toolkit iGCT](https://chrome-stats.com/d/id290585562) — 2.80 / 5
- [GC Wizard](https://chrome-stats.com/d/id1506766126) — 4.80 / 5
- [OutdoorOnly Toolkit](https://chrome-stats.com/d/id6784397042)
- [GC Wizard Gold](https://chrome-stats.com/d/id1510372318) — 3.00 / 5
- [GCBuddy - geocaching](https://chrome-stats.com/d/id298774229) — 3.30 / 5
- [Kryptos Tools](https://chrome-stats.com/d/id6451396051) — 4.60 / 5
- [gcAE](https://chrome-stats.com/d/id1259388741) — 5.00 / 5
- [Geocaching Toolkit iGCT Pro](https://chrome-stats.com/d/id511743719) — 3.30 / 5
- [Puzzle Sidekick](https://chrome-stats.com/d/id678644111) — 4.90 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id438313105)