What is the best iOS writing software for novelists?

The app store sells iA Writer for $49.99 and this price is confirmed when you visit iA Writer's website - ia.net/writer. It's also the most expensive platform they sell the app on, and each platform has its own price and there is no bundle that contains all three. iA.net also does not believe in or use coupons or sales. Ever. So that's the price. Period.