GCTools - the geocaching tool collection!

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

- Target guidance
- Projection of coordinates
- Distance between coordinates
- Intersection of lines
- Intersection of circles
- Intersection of line/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

- 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 instead of writing a review here. We cannot contact you that way to find a solution.

What’s New

Version 3.4.1

- The coordinate parser has been improved and supports more formats, e.g. the coordinate format used by
- 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

Ratings and Reviews

2.5 out of 5
10 Ratings

10 Ratings

Jasonoz007 ,


Can't read the numbers.

BobKrohn ,

Awesome Tool

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.

Charlieios ,

Nice update

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


Achim Heynen
41 MB

Requires iOS 9.2 or later. Compatible with iPhone, iPad, and iPod touch.


English, German, Spanish

Age Rating
Rated 4+
© Achim Heynen, Jan Rombold
In-App Purchases
  1. Coordinate Storage $0.99
  2. Circle Tools $0.99
  3. Vigenere/One Time Pad Cipher $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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