Dad just came to me: "I have a great idea for an app you could build"
I thought "Wow.. That's cliché"

What was the weirdest app/website idea u ever had but will never execute??

Alright got an idea I have for my game engine that I'd love some input on...

So the engine has emphasis on user made content and openness to that content (EG. open source dev tools and no licencing of art) but I also want to try and build a basic ecosystem with the engine and one way I'm doing it is with cross game mods (Take a mod from one game and drop it in another and it just works... Famous last words) but something I want to try is a companion app for the engine itself...

So it'll have a custom written save system baked in engine to make progress saving and the like simpler for the end user, thinking about building an app for smart watches and phones that would connect to the engine and actually back up and sync local saves to the app and vice versa as long as they have a connection (Hotspot your phone, bluetooth or wifi) but allow you to manage some data within the app by building a basic API to let devs show the user information about the save and the game by adding description, thumbnails to distinguish games and the like...

Just want opinions if it may be a good idea to invest some time into and if anyone has idea's that could make it better.