I'm not in the market for this kind of app, but thank you for making it a straight $9.99 purchase, instead of a $4.99/month SaaS (rental) scheme. Or some bogus in-app purchase that gets negated somewhere along the way when the app auto-updates and the previous in-app purchase is no longer available. I can't tell if it syncs data with my other Apple devices, but if it does, it would be great if it had the option of do…
When you pay upfront, the dev is not incentivized to try and keep you. So the product gets worse and worse until it dies.
If you pay overtime, the whole game is “how can we make this person love the shit out of this thing for as long as possible.”