The story
Everyone has a list. Haunting You is where you keep it. For every target you note who they are, why they had it coming, how they could still get out of it, and how haunt-worthy they are on a scale of one to ten ghosts.
It looks like a séance and behaves like a to-do app. The mist is a Metal shader, the candles flicker, and entries dissolve into smoke when you let someone off the hook. You can leave notes to be delivered after you are gone, design your own ghost, and pick your tombstone.
No accounts, no analytics, no subscription. One price up front, and your list stays on your device (or in your own iCloud, if you want it to outlive your phone as well).