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TravelTime Maps: Area covered in a given time with a given mode of transportation - https://app.traveltime.com/
(app.traveltime.com)
I use this tool when I'm looking for a place to move home.
While the maps for walking and cycling look rather unsurprising, the maps for driving and public transports can reveal surprising insights.
I don't want to check apartments only to find out they are too far away from my points of interest. And with too far away, I naturally mean time, not distance. Traveltime Maps helps with that.
So I create a map layer centered around my workplace, a layer for friends, a layer for another point of interest. The common overlap area is the area in which I would be willing to live. By definition, all my regular trips can be done within the time limit I find acceptable.
An example for Tokyo, public transport, 75 minutes:
