I have two suggestions. First is YR weather, is is from the Norwegian bureau of meteorology, and I find it really reliable and accurate in a lot of places. I actually had it recommended to me by a farmer in the middle of bowhere North East Victoria, Australia who said it was the most accurate for him in his area which actually turned out to be really true!

Second is Peak Finder, which I think is a one time paid app, but I’ve had it for ages so cant remember. It is an augmented reality app that you hold up to the horizon and it will tell you what all the mountains that you see are.