Question: Do you know of a solution that offers a free plan with unlimited local telemetry and mobile metrics for small to medium-sized teams?

For a service with a free plan that includes unlimited local telemetry and mobile metrics for small to medium-sized teams, bitdrift is a good option. It offers real-time visibility into mobile experiences with unlimited telemetry and a free plan that supports up to 10,000 active devices per month and five developer seats. The service includes features like Session Timeline, UX Debug with Session Replay, and a Real-time Control Plane that can help developers deliver higher-quality, more efficient mobile apps with shorter feedback loops.

Another good option is Honeycomb, an observability service that lets teams quickly identify the source of problems in distributed services. Honeycomb offers unlimited custom attributes, distributed tracing, smart data sampling, and debuggable Service Level Objectives (SLOs). It offers unlimited seats and charges by event volume, so it's a good option for teams of any size. It also integrates with Slack and supports OpenTelemetry, so you can send data straight to the service.

TelemetryDeck is an analytics service that offers real-time, accurate and private insights to help developers improve their apps. It supports iOS, Android, React Native, Flutter and websites, with features like user insights, app version tracking, funnels, custom data analysis and error tracking. The service is privacy-focused and offers a free starting point with detailed documentation for setup and integrations.

Last, Logz.io packages open-source monitoring tools into logs, metrics and trace data to help you find and fix problems in production. It can monitor more than 300 cloud platforms, infrastructure components and applications, and offers features like log management, infrastructure monitoring and distributed tracing. Logz.io offers a 14-day free trial, so you can try it out without paying a cent upfront.