What is "readability"

Readability \Read`a*bil"i*ty\ (r[=e]d`[.a]*b[i^]l"[i^]*t[y^]), n. The state of being readable; readableness.

1829, from readable + -ity.

n. 1 The property of being capable of being read; legibility. 2 The property of being easy or engaging to read.

1. n. the quality of written language that makes it easy to read and understand

2. writing (print or handwriting) that can be easily read [syn: legibility] [ant: illegibility]

Readability is the ease with which a reader can understand a written text. The readability of text depends on its content (the complexity of its vocabulary and syntax) and typography ( font size, line height, and line length). Researchers have used various factors to measure readability, such as

• Speed of perception
• Perceptibility at a distance
• Perceptibility in peripheral vision
• Visibility
• Reflex blink technique
• Rate of work (reading speed)
• Eye movements
• Fatigue in reading

Readability is different from legibility—which is a measure of how easily a reader can distinguish individual letters or characters from each other. Readability can determine the ease with which humans can read computer program code, such as in embedded documentation.

Readability is an Internet-based "read it later" service launched in 2009 by Arc90. It is similar to competitors Instapaper and Pocket in that it allows a user to save an article from the web and read it later without the clutter of the original website. It started originally as a bookmarklet to remove clutter from webpages and reformat the main article text in a readable font and layout, but following the popularity of the bookmarklet, it evolved to become a service with an app.

One distinguishing aspect of Readability was that it attempted to setup a subscription model where users of the service paid a monthly fee, a large portion of which would go to the publishers of the content they read in the Readability service. This business model faced two major hurdles: criticism by publishers and issues with Apple's App Store pricing model. In 2011, Readability got a large amount of publicity after Apple rejected their app from the iOS App Store as it used a third party payment system that circumvented Apple's 30% cut for in-app subscription payments. Readability argued that Apple taking a 30% cut from their subscription revenues would cut into the money they were giving to publishers.

Money that was collected for publishers who did not sign up to Readability's publisher program would be kept by Readability themselves. This led John Gruber, author of the popular Daring Fireball technology blog, to describe Readability in 2012 as "scumbags" as well as extended discussion among bloggers and journalists as to the ethics of Readability's business model. Gruber later clarified that his primary issue was that Readability told its users that it would distribute 70% of its subscription fee to publishers, when in fact it was only distributing a portion of that 70% to the publishers who had registered, which he described as "misleading at best, and arguably dishonest". Following the controversy, Readability's subscription model was discontinued.