They have an international version, called Windy Maps. It's the same app, just with international branding & marketing: https://play.google.com/store/apps/details?id=cz.seznam.wind...

I definitely recommend it for worldwide use. It can do _everything_ offline, which is something rarely seen in this age. I have found it very practical for hiking Japanese countryside.

Best worldwide outdoor map there is, with offline support. I use it very often to find trails not even locals know about (e.g. Japan). Don't forget to switch to Outdoor mode!

As a non Czech I assumed it was a nice layer on top of OSM tiles, but the outdoor trails are truly high quality.

Only have managed to fault it once whilst trying to decide how to descend a mountain in Slovenia.