Help to improve the OpenStreetMap with StreetComplete!
This app finds incomplete and extendable data in your vicinity and displays it on a map as markers. Each of those is solvable by answering a simple question to complete the info on site.
The info you enter is then directly added to the OpenStreetMap in your name, without the need to use another editor.
Mapping with this app is a lot of fun! Sometimes I just go for a walk and open up StreetComplete to see if I can add some small contributions, like the opening hours of some nearby establishment or whether a given entity is still at the location.
You can also customize what kind of questions are shown so you can skip on things you may not like.