Geofencer review
A free, open-source Kotlin library for Android geofences and background location events.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Geofencer is an open-source Android library for developers adding location updates and geofence events to Kotlin applications. It lets apps create and manage geofences with coordinates, a radius, labels, messages, and transition settings. The library exposes enter, exit, and dwell events, along with location updates through Kotlin SharedFlow. It is aimed at teams that want geofencing logic inside an Android app rather than a hosted geofencing service, and its open-source model makes it available without a paid plan.
Background behavior is a notable part of its scope. Geofencer documents WorkManager-based handling for app termination and device reboots, and supports custom actions in response to geofence and location events. Developers can tune tracking intervals, fastest intervals, displacement, and priority, then apply filters for accuracy, speed, provider quality, consistency, and dwell confirmation. That gives Android teams controls over how location events are gathered and qualified, though the implementation remains an application-development task rather than a ready-made operations console.
Its ecosystem fit is focused: the listed integrations are Google Play Services Location and WorkManager, and distribution is through Maven Central or JitPack. Geofences use a center coordinate and radius, so teams requiring other shapes or support for iOS should look elsewhere. Documentation and community are the listed support channels. Choose Geofencer when an Android app needs configurable circular geofencing and background event handling under developer control; avoid it if you need a cross-platform or hosted service.
Geofencer pros and cons
- Where it wins
- Supports enter, exit, and dwell transitions for circular geofences.
- Configures location intervals, priority, displacement, and filtering.
- Uses WorkManager for handling app kills and device reboots.
- Where it doesn't
- Targets Android only; it is not a cross-platform geofencing option.
- Geofences are circular, defined by a center coordinate and radius.
- Requires developers to integrate a library rather than use a hosted service.
Geofencer fact sheet, pricing and score →
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