#1 best-selling iPad app in US, Japan, UK, Germany, and 17 other countries! Duet turns your iPad or iPhone into the most advanced extra display for your Mac & PC. Developed by a team of ex-Apple engineers, Duet offers unparalleled performance and display quality - all with zero lag.

Grammarly is a technology company that develops a digital writing tool using artificial intelligence and natural language processing. The Grammarly Keyboard goes where you go to make sure your writing always looks great. Whether you’re typing up an urgent email, an important LinkedIn message, or an essential Facebook post, Grammarly lets you write from your mobile device with confidence.