Letterspace is a note-taking app that boasts several useful tools for organising your notes. You can place hashtags in your notes and then search for them using the app. You can also add to-do lists with checkboxes without leaving the keyboard by using simple markdown. The control scheme is simple, with a swipe bar above the keyboard that allows you to move the cursor around intuitively. The app also adds a hash key to the default keyboard to make integrating hashtags even more seamless. If you find the default iOS note apps limiting, Letterspace is for you.