The app works well, and had been my go-to for creating reasonable approximations of scans, but when I opened it most recently, I was prompted to subscribe to "premium." I have already spent money to purchase the ad-free version of this app years ago, and I am not going to be paying again at what is frankly an extortionate rate ($299 for lifetime unlock, or $29.99 yearly) to unlock the full featureset of the app.