Let me start with a disclaimer: I am a happy Google Keep user so I don't make any claim not to be biased in this post. Just kidding:) but frankly, it's a wonderful app in my experience. Its web-version is equally useful and allows me to use my notes with other applications. I don't remember how I was living (or managing) without it. For the sake of completion, let me try to recall:) Before Keep, I was using hand-written notes, I had tried apps like Evernote, Google Calendar, Notepad, etc. but never became so habitual with any of them that they could become an essential part of my life.