I live in Switzerland and am (like many people here) an avid hiker. There are a lot of great hiking websites but they all suffer from the same problem: They are ultimately just a list of hiking routes that you need to plan around. Because I do a hike almost every week, the extra planning has become an overhead that takes time out of my life: how far away is it, what train should I take, whats the weather situation like, do I need to bring snowshoes, etc. The 65,000km of trails in this country also gives me decision paralysis!
So I'm building an app (React native/django) which takes a users current situation and preferences and then algorithmically suggests a few best options for them that they can quickly give a yes/no to. It's integrated with a lot of data like the train timetables, snow data, weather forecast etc.
I was able to reduce an hour of planning down to 5 minutes last week, so it's definitely working for me. What I am currently trying to do is figure out if other people have this problem and there's interest in the app concept.