Highlight

Highlight is an open-source monitoring platform that gives developers a unified view of their web application's health. It records user sessions, tracks errors, aggregates logs, and traces performance data, all accessible through a single dashboard. This lets you see not just when something breaks, but exactly what the user was doing, what errors occurred, and what the backend logs said at that precise moment.

The tool works by integrating with your application via its SDKs, which support modern frameworks and open standards like OpenTelemetry. It stands out by combining these typically separate monitoring functions into one cohesive system. You can set up custom alerts for errors or logs, use powerful search to find specific sessions, and even self-host the entire platform on your own infrastructure with a Docker setup.

This is built for development teams who need to quickly diagnose and fix issues in production web apps. Front-end developers use it to replicate tricky user-reported bugs by watching session replays. Back-end engineers correlate errors with specific log lines and trace performance bottlenecks across distributed systems. It's particularly useful for teams that value data privacy or have compliance needs, as the self-hosting option keeps all data in-house.