A great looking vector graphics app for the iPad by Serif Labs. From the App Store description:

Affinity Designer is the fastest, smoothest, most precise vector graphic design software available for the iPad. Whether you’re working on graphics for marketing materials, websites, icons, UI design or just like creating cool concept art, Affinity Designer will revolutionize how you work.

I don’t know when I’ll ever use it, but at $13.99, I’m more than willing to support developers that make best-in-class software for iOS.