react-native-geo-fencing

Leverages Google's Geometry library for high-precision point-in-polygon checks, as noted in the README's use of containsLocation from Google's APIs.

Implements native modules for both iOS and Android, ensuring reliable performance across platforms without relying on JavaScript-only solutions.

Offers a straightforward GeoFencing.containsLocation method that returns a promise, making integration easy with minimal code, as shown in the usage examples.

Works directly with navigator.geolocation to fetch device positions, enabling real-time checks without additional setup, demonstrated in the componentDidMount example.