The fenders of bike-share bikes are small, mobile canvases that accumulate layers of graffiti tags, stickers, and markings over time. This app collects photographs of those fenders, building a searchable gallery organized by bike, contributor, and individual tag.
Contributors scan a bike's QR code, photograph its rear fender, and upload the image. They can then outline and label specific tags within each photo, connecting the same artist's work across different bikes. A leaderboard tracks the most active contributors by day, week, month, and all time.