StreetComplete turns nearby OpenStreetMap gaps into simple on-site quests for mobile contributors

StreetComplete is a mobile survey app that helps users improve OpenStreetMap by showing nearby missing map details as small quests. Users answer simple on-location questions, and their contributions are added directly to OpenStreetMap under their account without needing a separate editor.

The app lowers the barrier to crowdsourced mapping by making data collection feel like a lightweight, local task rather than a technical editing workflow. This approach can improve map freshness and coverage, especially for details that require real-world verification.