I have had it on my phone for years and has been accurate when I used it. The biggest issue is forgetting it is on my phone when I am in a rush to find a bathroom.
The description doesn't say, do you know where that app gets its data from?
The map background and routing instructions from screenshots are from Google, but I'd be surprised if Google collects toilet data, lets you query that via an API, yet doesn't show that in their own app. Does this app have its own database, or is there some third party that collects an overview of these?
Based on the properties it shows for a toilet in a screenshot, it could be OSM, but then some reviews complain that there is no field for "last checked" yet OSM supports that (check_date=YYYY-MM-DD) so either that's not it or they don't parse/show that field
I have had it on my phone for years and has been accurate when I used it. The biggest issue is forgetting it is on my phone when I am in a rush to find a bathroom.