gjGPXPreview Is on the App Store

May 24, 2026

Tagged with: gjgpxpreview, macos, app, app store, claude, quicklook

372 words; 2 minutes to read.

gjGPXPreview is my third macOS app released on the App Store.

During the development of gjRoutes, my multi-route GPX viewer for macOS, iPadOS, and iOS, I often found myself wanting to quickly peek at the contents of a GPX file on my Mac before loading it into gjRoutes for testing. On macOS there’s a great solution for this called Quick Look — but nothing I had installed supported it for GPX files, so I decided to write my own.

Once again, I called on Claude to help with the code. My original plan was to build a standalone proof-of-concept that could preview GPX files via Quick Look, with the intention of eventually folding it into gjRoutes. But once it was working and feature-complete, it struck me that a lightweight standalone app might actually be more useful to more people than something tucked away inside a full GPX viewer.

And so, gjGPXPreview was born. Claude did the heavy lifting on the code but, unlike gjPDFs, I did write and tweak some of it myself. One interesting difference from gjRoutes: rather than using the excellent CoreGPX package, Claude opted to roll its own GPX parser — and it works really well.

If you work with GPX files and want to quickly check their contents without firing up a full app, grab gjGPXPreview from the link below and give it a go. Hopefully you’ll think it’s worth the small fee — and if you enjoy it, a review would be much appreciated. Thanks!