New York, hour by hour

Each dot is a building with a public defibrillator. The shape around it is the area within a two-minute walk. Move the clock and watch which ones lock.

When

Tuesday, 2 PM

Defibrillator locations at this hour

Open: –
Locked: –
Hours unknown: –

Open and locked follow each venue's published hours, or the school day (7 AM to 6 PM on school days) for schools.

Assumptions you can change

School buildings lock at

Count AI-estimated hours Amazon Bedrock's estimates for venues with no published hours. Off by default: headline numbers use published hours and the school calendar.

Show on the map

Two-minute walking areas ZIP codes, shaded by cardiac-arrest calls at this hour Defibrillator locations

Click any location to see its week and where its hours came from.

Loading 4,000 locations…

Built on AWS, end to end

Every number on this site comes from this pipeline. The code is open, so any city can run it on its own data.

Amazon Location Service · MapsThe monochrome basemap under every view, light or dark to match the page.
Amazon Location Service · PlacesFound the published opening hours of 742 venues that host an AED, and turns addresses into points for your own data.
Amazon Location Service · RoutesA two-minute walking area for every one of 4,032 AED locations, plus walking times and routes when you drop a pin.
Registry of Open Data on AWSOverture Maps places: 691 fire stations, police stations and hospitals that could host a 24/7 cabinet.
Apache Iceberg tables on Amazon S3A nightly snapshot of New York's AED registry. Iceberg keeps every version, so the site can show what changed.
Amazon Athena + AWS Glue Data CatalogWrites the Iceberg snapshots, and queries Overture Maps where it sits on the Registry of Open Data.
Amazon BedrockEstimates hours where nothing is published, graded blind against known hours, and runs the two-sided debate.
Amazon API GatewayThe public API, with self-serve keys, usage plans and throttling.
AWS LambdaThe API, the MCP server for AI assistants, and the nightly refresh.
Amazon EventBridge SchedulerStarts the refresh every night.
Amazon DynamoDBCaps how many keys and AI debates can be created each day.
Amazon CloudFront + Amazon S3Serves this site and its open data downloads.
AWS CDKThe whole stack in one deployable app.