Plinth

Name any US foundation or nonprofit and see how it actually gives, or who actually backs it.

Active

Plinth is a US nonprofit and foundation intelligence database built from public IRS Form 990 and 990-PF filings: about 211,000 grantmakers — every US filer that itemized a grant — and 20.1 million grants, resolved into a multi-year funding network. It shows who funds any nonprofit, every foundation's grantees, which funders co-fund the same organizations and which portfolios resemble each other, and it is available through a public grants API. Alongside foundation grants, we track federal government funding (grants and contracts, from USASpending) and state government grants (from state transparency checkbooks), so a nonprofit's page shows its philanthropic and government funding together.

Org. type: For-profit business / social enterprise / B Corp
Project type: Tool or platform, Database
Language(s): English
Features: API, Analytics
Categories: Advocacy tech, Civic data, Get funding, Open civic data, Open government data, Open philanthropy, The People, The Tech, Tools for Funders, Watchdogging and transparency, Watchdogging philanthropy
Added: 2026-08-14
Last modified: 2026-09-29T07:12:27.000Z

Additional details

Formats: web app
Number of integrations: 0
Activity status: Likely Active
Geographic focus: United States of America 🇺🇸
Geographic focus — country: United States of America 🇺🇸

More in Advocacy tech

https://orbitalradar.com/satellite-eye/

Satellite Eye

Satellite Eye is a free web-based imaging-satellite pass tracker from the space-tracking site Orbital Radar that estimates how often Earth-observation satellites pass over any location and gives it an A-to-F "surveillance score".

2026

Advocacy tech, Civic data, Civic maps, Data visualization, Emerging tech, Hardware, Mapping, Satellites, Smart Cities and sensors, The Tech, Watchdogging and transparency

https://billionairetaxnow.org/

California Billionaire Tax Act

Prop 40 is a call for California's billionaires to step up and pay a one-time, 5% emergency billionaire tax to prevent a healthcare collapse.

SEIU Washington DC

Advocacy tech, Organize campaigns, Specific campaigns, The Tech

https://flocksurveillance.org/

Flock Surveillance

Flock Surveillance Map is an independent surveillance-transparency map that plots the locations and status of Flock Safety camera and drone devices across the United States.

2026

Advocacy tech, Cameras, Civic data, Civic maps, Emerging tech, Hardware, Mapping, Smart Cities and sensors, The Tech, Watchdogging and transparency

https://nursingledger.com/

NursingLedger

Search CMS nursing home ratings, federal penalties, staffing, and ownership records for every certified U.S. nursing home.

2026

Advocacy tech, Bureaucracy tech, Civic data, Consumer watchdogging, Dashboards, Data visualization, Govtech, Public records, The Tech, Watchdogging and transparency, Watchdogging government

https://ebrigade.app/en/volunteer-software/

eBrigade

eBrigade gives associations, NGOs, and civil protection organisations a single platform to schedule, mobilise, and retain volunteers — including those with intermittent, on-call, or seasonal availability.

Paris

Adjacent Fields, Advocacy tech, Disaster response and humanitarian tech, Manage volunteers, Nonprofit tech, Organize campaigns, Tech for public challenges, The Tech