Developer Marco Ament has reported that his Instapaper 4.1 for Retina Display iPhones and the new iPad has gone live in the App Store, offering greatly improved readability along with six new fonts (three serif and three sans-serif), a full-screen mode, new gestures and more. The update introduces a gradual descent into Automatic Dark Mode based on sunset times of the user's location, with the in-between state known as "Twilight Sepia."
