Flexcil is an underdog in the group of annotation apps for the iPad. While rather new, it comes with some novel approach and fresh wind.
Everybody knows this situation: You work with a PDF, like literature or lecture slides, but then, you also want to take a couple of notes on the side in a notebook. Ideally, everything in digital. But, when having a PDF annotation app and another app for digital note-taking side-by-side, the multi-tasking capabilities of an iPad soon hit their limits.
Using Flexcil, you can work on multiple documents at once with an overlay interface. It supports dragging elements from your PDF to a notebook, and taking valuable notes in a scratchbook while still looking at the slides or book; all without leaving the app or using multi-tasking.[…]