I wonder if the problem is calling them programming 'languages'. Learning a new human language is hard, learning a new programming language not so much. You wouldn't hire someone for a job requiring Spanish if they spoke Russian instead. For non-technical people the metaphor around 'languages' might be confusing.

Each time someone generates a map I calculate the time to each reachable station then use the valhalla routing engine to generate an isochrone centred on the station with the remaining time.

Or maybe there's a bug... I might make the walking speed adjustable.

I won’t mind providing some additional data!

Hi HN, Isochrone maps show areas which are reachable within a given time limit. Specifying them for car journeys is straightforward, but scheduled public transport add lots of factors which affect how far you can go, e.g. what time are you setting off?, what day of the week is it?. There are already ischrone generators out there, but none of them let you set all the relevant parameters - so I made one.