There's no app because:

- Cars vary widely in how they hold value (for example: http://www.autotrader.com/research/article/car-news/209232/2...)

- Cars will always depreciate, houses will often _appreciate_

- Leasing is almost always the poorer choice, barring basically the one case where you know you will need a car for the lease term only (and will not be getting another car afterward)