Underline is an app I often wish I had when reading a paper book. Yes, I do read on Kindle, and have become rather a sparse consumer of physical books out of care for the planet. But, every once in a while, I’ll treat myself to a flesh-and-bone book to go through the joy of underlining great thoughts, encircling interesting ideas, and annotating my own takes on the margins.

Often, I find myself wanting a single-purpose piece of software that uses the might of text recognition but only on underlined text. A simple app to bring the incredible power of the digital marginalia into the magical world of a physical book.