This app will calculate the exact price that should be charged for a taxi ride, based on the fares you will set first in the app, which requires :

* the initial fare : the price that is charged when the ride starts
* a fare per kilometer : you should set this for your geographical zone, using this helper :
http://www.taxi-calculator.com/taxi-rates
* a fare per minute : price that is added when you are stopped in the traffic
* eventually, a number of free kilometers that is included in the initial fare ( like in Paris ).

here there is no unity for currencies, you can use your local currencies.

the calculation of the fare would work online and offline, and if you have a data connection, the app will also calculate the optimal route and compare it to the real route, this functionality can also work if you have cached the map of your area before ( this is automatic ).

so the idea is to check you are paying the correct fare for your taxi rides and see if you can spare some money using some taxi service or another.

* You can run this app 5 times for free and then you'll be asked for a contribution of 1€/month to use it without restrictions.