The new SnapCrap app is bringing San Francisco’s poop problem into focus.

The free app launched Tuesday for iOS users invites people to take photographs of feces on streets and sidewalks that need cleaning and delivers a report to the city’s 311 hotline

Sean Miller is the brains behind the app and told NBC Bay Area he was inspired to start the project when he moved from Vermont to San Francisco in 2017 and was surprised to find himself constantly stepping over human waste.

San Francisco is known for its filthy streets; the 311 line receives about 65 calls regarding sidewalk poop every day. To address the issue, the Department of Public Works announced in April it hired five staffers to join a “Poop Patrol” to steam clean sidewalks and clean up feces.