| Product | Highlight.io |
| Website | highlight.io |
| Category | Monitoring / Observability |
| License | Apache 2.0 (open source) |
| Pricing | Free (500 sessions/mo), Pay-as-you-go from $150/mo |
What Is Highlight.io?
Highlight.io is an open-source monitoring platform that combines session replay, error tracking, and logging in one tool. Watch exactly what a user did when an error occurred, see the frontend error alongside the backend logs, and trace the problem from click to server response.
The “fullstack” approach is what sets Highlight apart. Most monitoring tools focus on one layer: Sentry for errors, LogRocket for session replay, Datadog for logs. Highlight combines all three with correlated data, so you don’t switch between tools to debug a user issue.
Key Features
Session Replay
Record and replay user sessions. See clicks, scrolls, form inputs, and page navigation. When a user reports “it’s broken,” watch their session instead of guessing. The replay includes console logs and network requests, so you see the technical context alongside the user’s actions.
Error Tracking
Capture frontend and backend errors with stack traces, user context, and session replay attached. Every error links to the session where it happened. Group errors by fingerprint, assign to team members, and track resolution.
Logging
Send structured logs from your backend and query them alongside session replays and errors. When an error fires, see the backend logs from that exact request. Structured search with filtering by level, service, and custom attributes.
Traces
Distributed tracing connects frontend actions to backend operations. See how a button click flows through your API, database queries, and external service calls. Identify where latency lives in the request path.
Who Is This For?
- Teams that want session replay + error tracking + logs in one tool
- Developers debugging user-reported issues
- Startups that want a monitoring stack without Datadog pricing
- Companies that prefer open-source monitoring
Pros
- Session replay + errors + logs + traces in one platform
- Open source (Apache 2.0)
- Correlated data across all signals
- Self-hosted option
- Free tier (500 sessions/mo)
- Modern, fast UI
Cons
- Smaller ecosystem than Datadog/Sentry
- Session replay adds page weight
- Self-hosting requires infrastructure
- Fewer integrations than established tools
- Pay-as-you-go can be unpredictable
Verdict
Highlight.io is the best open-source fullstack monitoring platform. The combination of session replay, error tracking, logging, and traces in one tool eliminates the context-switching that slows down debugging. For teams that are currently using separate tools for each signal, Highlight provides a unified view at a fraction of the cost.
For enterprise teams with complex monitoring needs (APM, custom dashboards, alerting workflows), Datadog or New Relic remain more comprehensive. Highlight excels for teams that want a single, integrated monitoring experience without enterprise complexity or pricing.