I just released version 1 of Farely.

It’ll calculate the exact amount you need to add to your NYC Metrocard so you don’t have leftover change.

Just add in your current card’s balance, and, optionally, the most you want to put on your card. You can also add it to your home screen and/or use it offline (i.e., below ground panicking before the ticket machine).

Inspired by I Quaint NY and the wonderful but not mobile friendly Calculator.