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Peak visor is bloody good.
Either use a 3D map like google earth, or set it to AR mode and point your camera. Identifies mountains, tracks, ski runs, mtb tracks, huts n shelters, most trails built in or set your own route.
It’s not a topo app (NZ use Maptoaster for that) but it’s bloody good and free. There is a pro subscription but I’ve never used that. Also works offline.