I found Where is public toilet for Android extremely good, at least all over Europe and North America, sometimes even in remote places, completely unexpected. It is community sourced, which makes it very useful for all updates.
Google Maps has worked for me. I downloaded Flush and then never used it. I’m still bookmarking this site because you can never have too many bathroom-finding tools .
Wei said:
Well it’s buggy all I see is part of the map or I don’t see at all.
Well that sucks, I tested it on a bunch of devices. Are you on a very slow connection? If you want to, DM me with your setup (browser+iOS/Android/Windows/Mac/Linux) and I can try to debug.