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If you use the excellent Mapy.cz app then be aware of changes to the app for using offline maps. Particularly handy when in areas of poor signal. They used to be free for any users of the App
You now need to have an account to download and access offline maps. You get 1 free country per free account. If you want multiple countries then you need to have a Premium account and pay £18.99 p.a. So imagine walking along the Kara****en hills on the Austria/Slovenia border - you'll need 2 countries to cover the route.
A small price to pay for decent cartographic maps for your travels.
I use MapOut, which is a one time payment app then download any tiles you want. Works well. They're all just shells for looking at OpenMap data.