Firebase Performance Monitoring
5.3#22 in mobile app monitoringAndroidiOSWeb
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It suits developers and teams working on Android, iOS, web, or Flutter applications who need performance monitoring and network request tracing. The free Spark-plan setup may fit projects avoiding a payment method.
Middleware may suit teams that need visibility across infrastructure, applications, databases, and real-user activity. Its free tier includes community support, while BYOC lists 24x7 support and a dedicated account team.