Not everyone will be familiar with Readdle, but the developer has been around ever since 2007 and enjoying a steadily-increasing user base ever since. What began as a single book reading app with a handful of followers has since turned into a large collection of useful apps (scanning, printing, reading, etc) with over 16 million downloads. To celebrate, Readdle is dropping their prices for a limited time.
At the moment you can download any, or all, of the following apps at a significantly discounted price:
Scanner Pro - Originally $6.99, now $1.99.
Printer Pro iPhone - Originally $4.99, now $1.99.
Printer Pro iPad - Originally $6.99, now $1.99.
Calendars+ - Originally $6.99, now $1.99.
PDF Converter - Originally $6.99, now $1.99.