Instapaper a popular web app which save web pages for later offline reading. It is great for long articles and blog posts that you find during the day and would like to read, but don’t have the time when you find them. Save with Instapaper, then read later when you’re commuting, in a meeting, or waiting in line. It saves most web pages as text only, stripping away the full-sized layout to optimize for the iPhone and iPad screens. Distraction-free reading environment gets out of your way so you can focus on the content. Everything you download is then available offline, so you can read whenever you want, even on airplanes or on Wi-Fi-only devices away from internet connections.

The Instapaper icon is made of pure text which you can actually read the words if you enlarge the image. The text used in the icon is an excerpt from a Merlin Mann piece on 43Folders

Instapaper Features
#1 Adjustable fonts and text sizes
#2 Dark Mode for night reading
#3 Built-in English dictionary
#4 Syncs your position in each article between multiple iPhones and iPads
#5 Folders for organizing articles
#6 Scroll by full pages (pagination)
#7 Scroll by tilting (tilt scrolling)
#8 Lock rotation
#9 Download up to 500 articles at a time

Thanks Labnol