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The open source, fullstack monitoring platform: stop guessing why…
highlight.io is the open source, full-stack monitoring platform. With just a few lines of code, Highlight makes it easy to understand what's slowing down your users and swiftly address errors and regressions on your web app. Imagine that you have a customer reporting an issue on your web app. With highlight.io, you can playback their exact interactions to reproduce the bug and get notified of any future errors that could happen. That being said, we’re just getting started! We have plans to go way deeper into your observability stack to give you all of the visibility you need. Join us on this journey: - Star us on GitHub (https://github.com/highlight/highlight) to keep up with releases and news. - Join our Discord (https://highlight.io/community) to share product feedback and thoughts.
highlight.io is an open source, fullstack monitoring platform that provides visibility across the web application's errors, session replay, logs, and traces. It emphasizes self-hosting options and OpenTelemetry integration to help developers understand bugs and performance across the stack.
The platform offers session replay, error monitoring with customizable error grouping and alerting, logging with log-level alerts, and traces for performance insights. It features dashboards for visualization, OpenTelemetry/OpenTelemetry-like support, and integrations with common tools. It can be self-hosted via Docker and provides a unified view across errors, sessions, logs, and traces to analyze what happened, why, and how, across the full stack.
Who it’s for: Developers and engineering teams managing modern web applications who need observability across errors, logs, traces, and user sessions, including those who prefer or require self-hosted deployments.
self-hosting option available; mentions of customers and reviews; pricing page with multiple plans; onboarding via free tier
I currently run the Observability business at LaunchDarkly. I was the CEO at Highlight, which was acquired by LaunchDarkly in March of 2025.
Vadim Korolik is the founder and CTO of highlight.io, the open source session replay and error monitoring framework. A native of the Bay Area, Vadim previously worked at Pure Storage and drive.ai.
highlight.io is the open source, fullstack monitoring platform. We help engineers reproduce hard-to-crack issues, and understand how their product is used.
Highlight.io offers an open-source session replay and error monitoring tool that helps developers reproduce hard-to-crack issues and understand product usage by capturing user sessions and associated errors, with a privacy API. The launch states integration via simple frontend/backend imports and positions the product for developers and teams seeking additional observability beyond traditional monitoring.
From the original launch (Feb 2023) — may be outdated.
Highlight gives engineers full-stack monitoring/visibility into their web applications.
Open-source, dev-friendly observability.
