A new app from University of Washington researchers is bringing real-time data to Seattle’s network of little free pantries — the curbside cupboards that quietly supply an estimated 4 million pounds of food a year to neighbors in need. The tool, called PantryMap.org, maps micropantries and community fridges across the Seattle area and gives each one a live activity feed where users can report stock levels, post wish lists, share photos, and log donations.
At a glance
- Little free pantries: Seattle’s micropantry network supplies an estimated 4 million pounds of food per year — more than Washington State’s largest food bank — through a decentralized web of curbside cupboards.
- PantryMap app: The new app lets users check stock levels, post wish lists, and track donations across dozens of pantries in real time, reducing wasted trips and helping donors know what’s needed.
- Smart pantry sensors: Researchers retrofitted four pantries with door sensors, digital scales, and Wi-Fi microcomputers that anonymously report usage and weight data to the app without capturing any images or identifying information.
Why little free pantries matter
Micropantries spread rapidly during the COVID-19 pandemic as neighbors found low-barrier ways to share food without the overhead of a formal food bank. Anyone can leave food, anyone can take food, and no one needs to fill out a form or prove need.
That simplicity is also their weakness. Without any coordination layer, donors can’t tell what a pantry needs, and users can’t tell whether it’s stocked before making the trip. Senior research scientist Giacomo Dalla Chiara of the UW Urban Freight Lab saw that gap as a research problem worth solving.
“We know that there is a lot of food insecurity in Seattle and in the United States in general,” Dalla Chiara said. “But we know that there is also a lot of food waste — lots of people have a surplus of food. And we want to see how grassroots efforts like micropantries can address both food insecurity and waste at the same time.”
How the sensor system works
The pilot is funded by the National Science Foundation and draws on expertise from five UW units: the Urban Freight Lab, the School of Public Health, the Department of Civil & Environmental Engineering, the Global Innovation Exchange, and the Paul G. Allen School of Computer Science & Engineering.
Over the past seven months, the team has retrofitted four Seattle pantries with door open/closed sensors, digital scales, onboard microcomputers, and Wi-Fi antennae. The system tracks the flow of food in and out without identifying who is using the pantry.
Vicente Arroyos, a UW doctoral student who designed the sensor suite, was deliberate about that choice. “Putting cameras in the pantries could give us a lot of information about what specific foods are moving through the system, but that may also deter users who are concerned about privacy,” he said. “Instead, we settled on simpler sensors that measure weight and interactions like opening the door to measure stock levels while preserving everyone’s anonymity.”
Community already in motion
The project isn’t waiting for the study to end before showing results. In April 2026 C.E., recycling company Ridwell ran a nonperishable food drive across Seattle and delivered 25,000 pounds of food to the University District Food Bank. From there, volunteers from the Cascade Bicycle Club’s Pedaling Relief Project distributed food to micropantries around the city by bike — pumping both food and fresh usage data into the network at the same time.
At Saint Paul’s Episcopal Church near Seattle Center, rector Stephen Crippen welcomed the sensor installation. “It puts numbers on what we’re actually accomplishing,” he said. “It helps us get in touch with what’s going on on this street.”
The Washington State Department of Health and the nonprofit Sustainable Connections helped support the community fridges component of the project.
What comes next — and what’s still uncertain
The pilot is set to conclude in October 2026 C.E. Each sensor retrofit costs about $150, and the team acknowledges that the smart-pantry hardware will be hard to maintain once the study ends. Dalla Chiara also notes that other grassroots micropantry mapping efforts already exist online, and he doesn’t want PantryMap to replace them — the goal is to learn, not to centralize.
Whether the insights from this pilot can be translated into a sustainable, community-owned tool remains an open question. But the researchers are clear about what they’re ultimately trying to measure.
“Behind each little free pantry there is a whole system of behaviors — people trying to help one another,” Dalla Chiara said. “If we can understand that system better, we can support it better.”
Read more
For more on this story, see: University of Washington News
For more from Good News for Humankind, see:
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- The Good News for Humankind archive on food security
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