Initially, we wanted to focus more on spatial analytics than just data provide, so the Isoline API was an essential step for us.
It looks like it's still a bit underestimated as an analytics tool. However, we believe that things will change soon. More and more travel and accommodation services, real estate agencies understand the benefits of reachability analysis.
In addition to isolines for "cars", "trucks", "bicycles", and "walk" modes, the Isolines API supports "transit" or public transport mode. So you can analyze how far you can go by bus or train.