- I use an app called NoteLedge on my iPhone, and it works on Android deivces as well. It's a fairly simple app to learn how to use and it has quite a few useful tools that I use almost daily like creating to-do lists, saving/organizing bookmarks in individual folders, taking notes and brainstorming for projects at work. I like this app because even when I'm working on my phone, for example, I'm still able to get quite a few things done on the go, when I'm not in my office or at home, so I think if you're looking for something that will increase your productivity, this app is a good solution to considerI like using this app on my iPhone for taking notes on the go. The small screen is designed in a way that's easy to navigate. Useful and convinient.