Writer's helper

Blindely shooting for inspiration... any writer here? (Maybe/probably no need to be writer but it's easier for me to explain...) I'm looking for inspiration, how to collect ideas for my writing. some app I could have at phone and tablet and i can store there insirations, thoughts, pictures (screenshots or photos)... I have several stories in my head, trying to write blog, and I have too many places where I have notes and starting to be useless mess. So far I'm using mostly keep for written ideas, but I also use this app for shopping lists and other random stuffs so I would like to have some other place for writing ideas. Screenshots and photos are in gallery but usually I forgot about it by time. I want something like "writer's second brain". Do you use something? Do you have some good experiences to share? ;)