This notepad app might look simple at the start, but it offers a deep well of features that make it one of the most useful apps in the store. Users can add text notes and to-do lists, plus perform quick web searches from within the app. Users can then convert the searches into notes, along with relevant metadata. SpringPad also hooks into the Share function of other apps, so you can save links, text, and more as notes. The app syncs with a free online account where users can add or manage notes, which then sync back to the app.