Question: I need a lightweight error tracking service that doesn't require code changes for my React app.

If you're looking for a lightweight error tracking service that doesn't require code changes for your React app, Bugpilot is an excellent choice. It offers a full platform for monitoring and debugging errors without the need for code modifications or production dependencies. Key features include AI-assisted debugging with GPT-4, session recordings with browser logs, customizable error pages, and unlimited integrations with webhooks for notifications. Bugpilot also provides open-source client libraries and multiple pricing tiers to fit different needs.

Another useful tool is Replay, which focuses on recording and replaying your application's behavior to help with bug detection and test debugging. This browser-based tool captures application behavior with deterministic browser technology, allowing you to inspect issues without needing to reproduce them locally. Replay is integrated with continuous integration workflows, providing test run alerts and actionable insights to prioritize and address test issues efficiently.

For a more detailed approach to debugging, consider Flytrap. This tool provides detailed input and output data for every function and variable involved in an error, making it easier to pinpoint and fix bugs. Flytrap is easy to set up and supports multiple environments and frameworks, with a variety of pricing plans to suit different needs, including a free plan.