StreetComplete
StreetComplete is an easy to use OpenStreetMap editor that can be used without prior knowledge about OpenStreetMap. The app prompts users to answer questions like "What are the opening hours here?" or "Is this still here?" about places and objects in their surrounding. Answering these questions helps to keep the OpenStreetMap database complete and up to date.
Functionality
The app is based on a map view in which places and things with missing or dated OpenStreetMap data are marked. Users can complete this data by answering simple questions. These quests are designed in such a way that answering them on site is quick and easy and no special expertise or prior knowledge is needed. In case the answer to a quest does not match one of the selection options, other OpenStreetMap contributors can be asked for help by submitting a note.StreetComplete focuses on adding further details to already existing objects. As a result of this, users can only modify a subset of the data stored in the OpenStreetMap database. It is, e.g., not possible to change the geometry of buildings or roads. For such changes, users must switch to other editors, such as the iD editor.