As introduced by Ryan Christoffel in LiquidText 3.0: A Uniquely Digital PDF Experience, LiquidText is an unique app for PDF works on iPad. The app was recognized by Apple as the most innovative iPad app of 2015. It gets its update to version 3.0 recently.

Liquid Text is a tool for deep annotation and interconnection. It goes beyond what one can do on physical paper. The essence of the paper is more easily preserved. The connection between different points wihin the paper and with other paper can be easily established. In other words, it is a great tool for legal research.

Eddie Smith described some of the best new functions below.

Finger selections can make excerpts even while the Pencil is in drawing or highlighting mode. The Pencil can draw anywhere—not just on the PDF like most PDF editors, but even in the LiquidText workspace, right alongside your excerpts and comments.

You can even drawn a circle or box around anything in the PDF, and it extracts it as an image to the workspace. The image can be copied to your clipboard and even pasted into other apps. This is the first time I’ve ever been able to capture a portion of a PDF as an image without having to screenshot the whole screen and crop in Photos. This opens a lot of possibilities—like being able to capture a graphic and paste it into an app like Notability, to collect it with other visual notes.

The research experience on LiquidText is truly amazing. Not only one can annotate on the space outside of the paper, the gold feature for me is the instaneous connection with all the relevant part of the rest of the paper as well as other papers. The connection can be established super fast while reviewing the paper. Reaching related references becomes a breeze.

Now it would be a dream come true if LiquidText can establish some kind of connection with citation managers like Mendeley or Zotero and the word processing programs. For example, a drag and drop into the Word document brings alone the properly formated citation.