I like to use this app mainly because it syncs between devices. I can use it to write notes, save webpages, bookmark pages, create screenshots, save quotes and a host of other things I’m just learning to do.
I like that you can add tags to the things that you save which makes it easier to find them.
It is free, but there is also a paid option. You can download Evernote here.
What do you use to capture your ideas?