Hypernap may be a native app, but it's certainly not beautiful or fully featured. It uses the most basic interface elements thrown together in a messy soup. I have immense respect for people who manage to develop native apps, but when the interface looks like it was implemented as someone's very first experiment in XCode... well, there's a reason you don't pay much.

I don't understand why developers throw their arms in the air over pricing. Try out the app; if it has everything you will ever need out of such a tool and it greatly improves your productivity every single day... a one-time $50 payment is nothing. It's the cost of going out for dinner one evening.