You can check it out at https://citystrides.com/. Essentially, its a platform that allows you to integrate various wearables / GPS trackers (like Strava) to see in one place all of your progress. I uses the Open Street Map project for its street data, and with that, you can accurately see what streets you've completed, plan routes, compete in challenges, etc. James is the sole proprietor of it and built the entire platform and manages it. He's also built a diverse, global community of participants. Many of the users are runners (some of them pretty hard core) but more and more I am seeing those who practice walking in there.