There are lots of interactive isochrone maps, which can show you how far you can travel within a set amount of time. But there aren't many interactive isotim maps, maps which show you how far you can travel for different amounts of money.
In the UK you can now use faremap to see how far you can travel on public transit for the change you currently have in your pocket. Enter a destination into faremap and it colours the whole of the UK based on the cost of train travel to the destination from your current location. Just as an isochrone map shows lines of equal time this isotim map shows lines of equal transport cost. Each color on the map shows an area of equal travel cost.
As well as showing you how far you can travel for different amounts of money faremap is also a really useful split fare map. One of the many crazy and ridiculous barriers to train travel in the UK is that for many train journeys it costs more to buy one ticket to your destination rather than buying multiple tickets for different stages of the journey.
If you enter a starting station and a destination station into faremap it will show you the cheapest split fare tickets, tell you what stations you must travel through and the cost of each ticket that you need to buy.
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