# GCTools iOS4 - the geocaching tool collection for iOS 4!

> Geocaching tools for coordinate manipulation, encoding, decoding, and data conversion. (iPhone/iPad app by Achim Heynen.)

- Source: https://appshunter.io/ios/app/gctools-ios4-the-geocaching-tool-collection-for-ios-4/id591678358 (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: 2.80/5 from 4 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 4.0 · 5 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2013-01-21
- Data updated: 2026-06-05
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/gctools-ios4-the-geocaching-tool-collection-for-ios-4/id591678358/reviews.md

## What is GCTools iOS4?

GCTools iOS4 - the geocaching tool collection for iOS 4!

Here you find the tools to get your next multi and mystery caches done easily! This version supports old devices like the iPhone 3G that can't update to iOS 4.3 or above. If you use iOS 4.3 or newer please use the normal version of GCTools!

Coordinates:
- Target guidance
- Projection of coordinates
- Distance between coordinates
- Intersection of lines
- Intersection of circles (inApp)
- Intersection of line/circle (inApp)
- Coordinate conversion (DMS, DM, D, Lat/Lon, UTM)
- Saving/loading coordinates
- Mapview
- Integration of GoogleMaps, GoogleEarth, OpenMaps, OffMaps, Navigon and TomTom

De-/Encoding:
- Caesar Cipher (ROT-N)
- Alpha Cipher
- Affine Cipher
- Vigenere Cipher/One Time Pad (inApp)
- Morse Code
- Mobile Cipher
- Custom alphabets (inApp)

Interactive data tables:
- All mygeotools.de code-tables
- Periodic system
- Latin/arabic numbers
- Color alphabet
- Resistors
- Cross sum computation
- Prime numbers
- PI digits

Converters:
- Lengths
- Areas
- Volumes
- Masses
- Angles
- Speeds
- Times
- Temperatures
- Number systems
- Data sizes

- Flashlight
- Menu search

If you find something missing let us know!

If you purchase one or more inApps the ads will be removed!

If you encounter problems with the app please mail to mail@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
- Multiple cipher and code decoding
- Interactive data tables
- Unit conversion for various measurements
- Mapview integration with popular services
- Flashlight functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Advanced Alphabets | $0.99 | one-time |
| Coordinate Storage | $0.99 | one-time |
| Vigenere/One Time Pad Cipher | $0.99 | one-time |
| Circle Tools | $0.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/gctools-ios4-the-geocaching-tool-collection-for-ios-4/id591678358/reviews.md

### 1/5 — Ok

*2023-06-27*

Needs more...

### 5/5 — This app is great!!!!! Buy it AWESOME

*2014-07-26*

What the title says

### 5/5 — App is great

*2013-03-26*

Great app is free can be used on ios4 and has a wide range of conversation categories

## Frequently asked questions about GCTools iOS4

### What is GCTools iOS4 primarily used for?

GCTools iOS4 is designed as a collection of tools specifically for geocaching. It helps users with tasks like coordinate projection, distance calculations, and decoding various ciphers commonly found in geocaches.

### What types of coordinate functions does GCTools iOS4 offer?

GCTools iOS4 supports target guidance, projection of coordinates, calculating distance between coordinates, intersection of lines, and coordinate conversion between different formats like DMS, DM, D, Lat/Lon, and UTM.

### What encoding and decoding methods are available in GCTools iOS4?

The app includes tools for Caesar Cipher, Alpha Cipher, Affine Cipher, Vigenere Cipher/One Time Pad, Morse Code, Mobile Cipher, and custom alphabets, aiding in solving geocache puzzles.

### Does GCTools iOS4 support older iOS devices?

Yes, this specific version, GCTools iOS4, is designed to support older devices that cannot update to iOS 4.3 or above, such as the iPhone 3G.

### How can I remove ads from GCTools iOS4?

If you purchase one or more in-app features, the advertisements within GCTools iOS4 will be removed, providing an ad-free experience.

### What are the interactive data tables available in GCTools iOS4?

GCTools iOS4 features interactive data tables including mygeotools.de code-tables, the periodic system, Latin/arabic numbers, color alphabet, resistor codes, cross sum computation, prime numbers, and PI digits.

### What devices is GCTools iOS4 compatible with?

GCTools iOS4 is supported on iPhone and iPod devices, specifically targeting older models that run iOS 4.

### How often is GCTools iOS4 updated?

GCTools iOS4 was last updated on January 21, 2013, with version 2.1.4. As of its last update, it has not received recent updates.

## Version history (last 1 release)

### 2.1.4 — 2013-01-21

No release notes.

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## More apps by Achim Heynen

- [ColorPicker](https://appshunter.io/ios/app/colorpicker/id422625345)
- [GCTools](https://appshunter.io/ios/app/gctools/id438313105)

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

## Related topics

[gctools ios4](https://appshunter.io/ios/topics/gctools-ios4) · [gctools](https://appshunter.io/ios/topics/gctools)

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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.*