Highlight.io unifies the monitoring stack that teams typically piece together from multiple vendors. Instead of using separate tools for session replay, error tracking, logging, and APM, Highlight provides all four capabilities in a single platform with deep cross-linking between them. When a user reports a bug, developers can watch the exact session replay, see the frontend errors that occurred, trace the API calls to backend services, and read the server-side logs — all from one interface.
The session replay captures DOM mutations, network requests, console logs, and user interactions as a faithful reproduction of the user's experience. Error monitoring supports JavaScript, Python, Go, Ruby, Java, and other languages with automatic source map support for minified code. The distributed tracing implementation follows OpenTelemetry standards, making it compatible with existing instrumentation. Log ingestion handles structured and unstructured logs with full-text search and alert configuration.
With over 9,200 GitHub stars and venture funding, Highlight.io has positioned itself as the open-source alternative to FullStory and LogRocket for teams that want session replay combined with backend observability. The platform deploys via Docker Compose for self-hosting and offers a managed cloud with a free tier of 500 sessions and 1 million logs per month. SDKs cover React, Next.js, Angular, Vue, Python, Go, Ruby, Java, and more, with a clean integration experience that typically takes under 10 minutes.