By searching for an #iOS version of #streetComplete, the famous #openstreetmap easy-to-contribute tool, I'm discovering MapComplete https://mapcomplete.osm.be by pietervdvn and it is amazing.
Introduction video here: https://media.ccc.de/v/sotm2021-9448-introduction-and-review-of-mapcomplete#t=108
Source code: https://github.com/pietervdvn/MapComplete
OK, the UI has to be improved, I will see if I can help with that.