LiquidText, an iPad app for annotating PDFs and webpages, is a genuinely remarkable achievement — a delightful and useful piece of software engineering. Here’s what an annotated LiquidText file looks like:
You’ll see that you can highlight, but also comment in the margin on what you have highlighted, connect other comments to that, and pull out highlighted passages and keep them in the margin. It’s also possible to connect comments to one another in a mind-mapping sort of way, which could be very useful for visual thinkers. However, you’ll probably need a 12.9“ iPad to make that work — on my 9.7” model there’s just not enough room unless I shrink the document to the point that it’s unreadable.
Possibly my favorite feature of LiquidText is “Highlight View”: when you enable it, you can then pinch the screen vertically and see all the passages you’ve highlighted:
This is extremely useful. And in general I feel that LiquidText helps me to be a better reader: more active, more responsive, and able to make better use of my responses.