I just did a cursory look at the
mapy.cz app. How is it different from Google maps? Does it show walking paths?
Not all of them, but very, very many -- and most Camino routes, and all of the (current) major ones. There can be missing routes, such as currently a section of the Olvidado, until recently the Via Romea from Germany was missing, and last time I looked several sections of the Via Augusta from Cádiz to Rome on its Spanish portions are missing. When I walked the Provençal Way portion of my last Camino, in 2019, a long section of that was missing too, but it's there now.
Some of the advantages of the
mapy.cz app is that it works on all platforms (even on Windows Phone (!!) though that version is very out of date), that the offline maps are 100% free, and that it's very good with dirt trails and agricultural roads if you want to make a detour away from an "official" route for some reason, or if your Camino requires DIY, or you're roughly following a historic pilgrimage route that hasn't been waymarked yet.
The Windows desktop version of the app is
great (I mean the app, not the website browser version), though you could only take it with you on a Windows higher-end tablet or a laptop ; great though for checking out the app at home, and planning, and so on.
So it shows the Camino route automatically (in Blue)?
Usually in blue -- but occasionally in red, if it's a secondary or less-travelled Camino route, or one that's been waymarked as something else than a Camino, even if it is one.