The geofence layer for products that need it.

Same zones run on your mobile app, your IoT device, and your server. Define once. Evaluate anywhere.

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Open source core·MIT licensed·949+ tests·Free during early access

$ flutter pub add polyfence

$ npm install polyfence-react-native

Flutter

React Native

Embedded

REST API

CLI

See it in action

Draw a zone, sync to a device, get events in real-time.

polyfence.io/zones

Zones

London Office

How it works

STEP 01

Draw zones

Define circles and polygons on the map editor or via API

STEP 02

Sync zones

Mobile SDKs and embedded devices pull zone definitions; server clients reference them by id

STEP 03

Evaluate anywhere

On-device in mobile and embedded SDKs, or server-side via POST /v1/evaluate for IoT and no-code

STEP 04

Monitor performance

Real-time analytics on detection speed, battery, accuracy

Privacy by default

Positions stay on the device or in your account. Zone events are the only thing we deliver — never raw coordinates, never identifiers.

Any geometry

Circles and polygons. No shape limits, no zone caps. Model the boundaries you actually need — not what native APIs allow.

Resource-efficient

Adapts to context — battery-smart GPS on phones, lightweight on constrained devices. No always-on drain.

Open source core

MIT licensed. Inspect the engine, audit the algorithms, no vendor lock-in. Build with confidence.

From phones to field sensors

Polyfence works anywhere location matters — mobile apps, embedded hardware, and everything in between.

Fleet & logistics

Know when vehicles enter or leave depots, customer sites, and restricted areas — without streaming GPS to the cloud.

Livestock & agriculture

Monitor grazing boundaries on solar-powered trackers. Lightweight API checks mean you can optimize for battery life — poll on schedule, not continuously.

Asset tracking

Detect when equipment leaves a job site or enters a geo-restricted zone.

Security perimeters

Trigger alerts when devices breach physical boundaries. No cloud dependency, no latency.

See all use cases

Works with your stack

Flutter, React Native, embedded devices, REST API, or CLI. Pick your integration.

# pubspec.yaml
dependencies:
  polyfence: ^0.13.0

// main.dart
import 'package:polyfence/polyfence.dart';

await Polyfence.instance.initialize();

final zone = Zone.circle(
  id: 'office',
  name: 'London Office',
  center: PolyfenceLocation(latitude: 51.5074, longitude: -0.1278),
  radius: 200,
);

await Polyfence.instance.addZone(zone);
await Polyfence.instance.startTracking();

// npm install polyfence-react-native

import { Polyfence } from 'polyfence-react-native';

await Polyfence.instance.initialize();

await Polyfence.instance.addZone({
  id: 'office',
  name: 'London Office',
  type: 'circle',
  center: { latitude: 51.5074, longitude: -0.1278 },  
  radius: 200,
});

await Polyfence.instance.startTracking();

# Sync zones to device on boot (or on schedule)
curl -H "x-api-key: $PF_KEY" \
  https://polyfence.io/api/zones > zones.json

# Evaluate a GPS fix against your zones
curl -X POST \
  -H "x-api-key: $PF_KEY" \
  -H "Content-Type: application/json" \
  -d '{"device_id": "tracker-01", "positions": [{"lat": 51.5074, "lng": -0.1278}]}' \
  https://polyfence.io/api/v1/evaluate

# Response
{ "events": [{ "zone": "office", "type": "enter" }] }

# Works from any device with HTTP:
# ESP32, Raspberry Pi, LoRa gateways, fleet trackers

# List all zones
curl -H "x-api-key: YOUR_API_KEY" \
  https://polyfence.io/api/zones

# Create a zone
curl -X POST \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "London Office",
    "type": "circle",
    "center_lat": 51.5074,
    "center_lng": -0.1278,
    "radius_meters": 200
  }' \
  https://polyfence.io/api/zones

# Install the CLI
npm install -g @polyfence/cli

# Authenticate
polyfence login

# List your zones
polyfence list

# Export as GeoJSON
polyfence export --format geojson

# Create a zone from file
polyfence create --file zones.json

View full documentation

<50ms

Detection latency

Zero

PII collected about your end users

949+

Tests across repos

MIT

Open source core

@polyfence

Fleet tracking, livestock monitoring, security perimeters, compliance zones, and more. See use cases →

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Free during early access. No credit card required.

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