OpenSAK
// Open Source Swiss Army Knife for Geocachers
A free, modern alternative to GSAK — manage your geocache database locally on Windows, Linux, or macOS.
// Features
Built by geocachers, for geocachers. OpenSAK handles the heavy lifting so you can focus on the hunt.
Import GPX files and Pocket Query ZIP archives with full Groundspeak field support including logs, attributes, and waypoints.
A GSAK-style filter dialog with ten tabs: text and date operators, logs, child waypoints, trackables, attributes, distance and direction from any point, lines and polygons, and raw SQL. AND/OR logic, invert, and saved filter profiles.
Colour-coded cache pins with clustering on OpenStreetMap. Click any pin to jump directly to the cache in the list. Corrected coordinates for mystery caches shown with an orange overlay.
Send your filtered cache selection directly to a connected Garmin device via USB — including newer models that use MTP — as GPX or GGZ, ready for offline field use.
Built-in converter, projection calculator, checksum tool, midpoint finder, and distance/bearing calculator.
Plan geocaching trips with route optimisation and export. Select caches from your database and build an efficient field route.
Add, edit, and delete custom waypoints per cache — parking spots, trail heads, stages, and more.
Browse and search through all logs for any cache with keyword highlighting. Scroll through the full log history without leaving the app.
Full interface in 11 languages: English, Danish, Dutch, French, Portuguese, Czech, Swedish, German, Swiss German, Polish, and Spanish. Community translations welcome.
Point OpenSAK at the mailbox that receives your Pocket Queries and import them straight from there — no downloading and unzipping by hand.
Manage separate databases for different regions or trips. Copy, rename, and delete databases and switch between them instantly.
All data stays on your own machine. No cloud, no accounts, no tracking. Your geocaching data is yours.
// Comparison
The only free, open source, cross-platform desktop geocache manager.
| Feature | OpenSAK | GSAK | iCaching | GeoGet |
|---|---|---|---|---|
| Free | ✓ Free | ✓ Free* | ✗ Paid | ✓ Free |
| Open Source | ✓ MIT | ✗ Closed | ✗ Closed | ✗ Closed |
| Linux | ✓ | ✗ | ✗ | ✗ |
| Windows | ✓ | ✓ | ✗ | ✓ |
| macOS | ✓ | ✗ | ✓ | ✗ |
| GPX / PQ Import | ✓ | ✓ | ✓ | ✓ |
| Advanced Filters | ✓ | ✓ | ✓ | ✓ |
| Garmin Export | ✓ | ✓ | ✓ | ✓ |
* GSAK became freeware with version 9.0.0 in 2019; active development effectively ceased in 2022.
// Download
Pre-built packages for all platforms. Free, no license key, no nonsense.
Windows: the Microsoft Store version is the easiest and safest choice — it is signed by Microsoft, trusted by Windows' Smart App Control, and keeps itself up to date. The direct download from GitHub is still available, but on PCs where Smart App Control is switched on (the default on many newer Windows 11 PCs), Windows may block it from starting. If that happens, install OpenSAK from the Store instead. See the User Guide for details.
// Open Source
MIT licensed. Every line of code is on GitHub. Contributions, bug reports, and translations are all welcome.