React Native is an open-source framework from Meta for building iOS and Android apps using JavaScript or TypeScript with React. Instead of rendering web pages inside a webview, it renders real native UI components, with a bridge (and JSI in the newer architecture) connecting your JavaScript logic to native device APIs. That is why one codebase can power both platforms while still feeling fully native. If you already know JavaScript and React, most of your skills transfer directly, and clearing architecture doubts early with an experienced React Native developer makes the ramp-up much faster.

Yes. React Native is officially supported for iOS, and thousands of App Store apps are built with it. The one practical catch: compiling and publishing an iOS build requires macOS with Xcode. If you develop on Windows or Linux, you can use a cloud build service like Expo EAS Build to generate and submit your iOS app without owning a Mac.

React Native Maps (the react-native-maps package) is a free, open-source map component library for React Native. It renders Google Maps on Android and Apple Maps — or Google Maps, if you configure it — on iOS, and supports markers, polylines, polygons, circles, overlays, camera animation and location events, making it the standard choice for maps in React Native apps.

After installing the library, import MapView from react-native-maps and render it with an initialRegion (latitude, longitude, latitudeDelta, longitudeDelta). Add children like Marker, Polyline, Circle or Overlay to display data, and use props such as showsUserLocation, onPress and onRegionChangeComplete to make the map interactive. Start with a basic map screen, then layer on markers and live location as the app grows.

Install the React Native Maps npm package with "npm install react-native-maps" (or "yarn add react-native-maps"). Autolinking handles the native setup in React Native 0.60+, but you still need configuration: an Android Google Maps API key in AndroidManifest.xml, and if you want Google Maps on iOS, an API key in AppDelegate plus a pod install. Apple Maps on iOS works without any key.

react-native-maps is bundled with Expo Go, so a basic map renders immediately in the Expo Go app. For anything beyond that — your own Google Maps key on iOS, custom native configuration, or production builds — create a development build using "npx expo prebuild" or EAS Build and use react-native-maps inside it. In the React Native Maps vs Expo Maps comparison, most production teams still pick react-native-maps in a development build because it is more mature and far better documented.

Yes, the react-native-maps library itself is free and open source under the MIT licence. Apple Maps on iOS is free to use, and Google Maps on Android does not require a billing account. The only configuration cost is using the Google Maps provider on iOS, which needs a Google Cloud API key with billing enabled on your project.

Place a Marker component inside your MapView with coordinate, title and description props. To customize it, pass an image or icon for a custom pin, wrap children inside the marker to render a fully custom view, add a Callout for tap-to-show details, and use draggable with onDragEnd if users need to reposition it.

react-native-maps does not include clustering out of the box. The common approaches are the react-native-map-clustering wrapper for quick setup, or custom clustering with Supercluster, where you group markers by zoom level, render cluster markers with a count, and expand them on press. Clustering matters most for delivery, cab and field-service apps that plot dozens or hundreds of moving points.

react-native-maps does not calculate routes itself. The standard pattern is to call the Google Directions API (or Mapbox Directions API) with an origin and destination, decode the returned overview polyline, and draw it with the Polyline component — which is how pickup-to-drop routes are usually rendered in delivery apps. If you only need turn-by-turn navigation, deep-link the user to the Google Maps app with a directions URL instead.

The strongest React Native Maps alternative is Mapbox via @rnmapbox/maps — it offers rich map styling, offline maps and very smooth performance, which is why delivery-tracking and logistics apps often prefer it. MapLibre React Native is a fully open-source option with a similar approach, and for simple web-style maps you can embed Leaflet in a WebView. For most standard use cases, react-native-maps still remains the default.

Geofencing means defining a virtual boundary — usually a latitude/longitude plus a radius — around a real-world location. The phone's OS continuously and battery-efficiently checks the device location against those boundaries and fires enter, exit or dwell events, even when the app is in the background. Apps use it for delivery-arrival alerts, employee attendance, ride-hailing pickup zones and location-based offers.

You need three pieces: draw the geofence visually with a Circle overlay on the map, monitor it with a location library, and handle the enter/exit events. In Expo, expo-location has built-in geofencing support; in bare React Native you can use libraries like react-native-background-geolocation or the native Android GeofencingClient and iOS region monitoring, always after requesting location permissions. A simple React Native geofencing example: define a 200-metre circle around a drop point, and when the device enters it, trigger a local notification saying "You have arrived". If background events refuse to fire, a focused 1:1 session with a React Native mentor who builds tracking apps can save days of trial and error.

Background geofencing is handled by the operating system, not your JavaScript: Android uses GeofencingClient with pending intents, and iOS uses Core Location region monitoring, which can wake your app when a boundary is crossed. Your React Native layer just registers the fences and listens for events, often through a headless task on Android. In Expo projects, React Native Expo geofencing is managed by expo-location's background geofencing, but you must request background location permissions, and Android battery optimizations like Doze can delay events on some devices — so always test on a real device.

For bare React Native, @react-native-community/geolocation is the standard choice — lightweight, built on native location APIs, and ideal for one-shot location requests. If you are on Expo, use expo-location. For apps needing continuous background tracking (delivery, cab, logistics), a dedicated background geolocation library is worth it because it handles battery efficiency, motion detection and permission edge cases. Most "my app crashes on location" issues come from missing runtime permissions, especially Android 10+ background location, so always verify permissions before calling getCurrentPosition.