If you want to do more advanced accessibility mapping, also have a look at https://mapcomplete.org/onwheels - same concept, but different implementation. Also OpenStreetMap based, so data you add there is shared amongst CoMaps, StreetComplete, ...

Disclaimer: I make this

This is great, I'm working on a project called AccessPath for detailed accessibility review of a place. Currently the prototype[1] is using Google Maps but I will be moving on to OpenStreet Maps for obvious reasons.

Thanks to you folks, Street Complete will also come handy to make places more accessible.

[1]https://accesspath.world/