Drafts is an incredibly simple app that allows you to record thoughts down very quickly with a very simple UI. You're thinking of something, you write down, save it, and move on.
Press and hold on a draft to copy it to your keyboard.
Drafts was made with the idea that if I think of something, I should be able to quickly write it down and be done with it. I made it for me and I hope it helps you and you use it... if you want.