Self-hosted geofencing API vs. Google's Geofencing API

Google's Geofencing API is part of Android's location services — it runs on-device, letting an Android app register geofences and receive enter/exit callbacks locally through the OS. It's free, built into the platform, and a reasonable starting point if your only requirement is "detect when this Android device crosses this boundary."

The gap shows up fast once you need anything beyond a single device on a single platform: Google's Geofencing API has no iOS equivalent, no backend component, no webhook delivery, and no way to see zone-crossing events anywhere except inside the app that registered them. It's a device-side primitive, not infrastructure.

What Google's Geofencing API doesn't do

No cross-platform coverage. It's Android-only. iOS needs an entirely separate implementation (Core Location's region monitoring), and the two don't share zone definitions, event formats, or delivery mechanisms.

No backend visibility. Geofence events fire inside the app on the device. There's no built-in way to see those events on a dashboard, route them to Slack, or feed them into a dispatch system — you'd need to build that delivery layer yourself from scratch.

No centralized zone management. Zones are registered per-device from app code. Updating a delivery boundary means shipping an app update or building your own zone-sync system — there's no ops portal or centralized zone store.

Where Fencemaker fits instead

Fencemaker operates as backend infrastructure, not a device-side OS primitive. Devices report location to your endpoint (from any platform — iOS, Android, or a tracking device that isn't a phone at all), Fencemaker's engine evaluates it against your zone definitions, and a webhook fires the moment something happens.

POST https://your-app.com/webhooks/fencemaker
{
  "event": "geofence.exit",
  "zone_id": "zone_service_area_north",
  "device_id": "device_2201",
  "timestamp": "2026-08-18T10:15:00Z",
  "coordinates": { "lat": 34.0522, "lng": -118.2437 }
}

What you get that a device-side API doesn't provide

• Cross-platform device tracking — not tied to Android's location services specifically
• Centralized zone management through an ops portal, no app redeploy needed to update a boundary
• Native webhook delivery to Slack, Telegram, or your own backend
• Dwell-time detection, not just enter/exit callbacks
• A single source of truth for zone-crossing events across your entire fleet, not scattered across individual devices

If you've hit the point where Google's on-device Geofencing API isn't enough — because you need iOS coverage, backend visibility, or centralized zone management — that's exactly the gap Fencemaker is built to fill.