highlight.io
AcquiredThe open source, fullstack monitoring platform: stop guessing why…
About
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.
Founders · 2
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.
Launch
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From the original launch (Feb 2023) — may be outdated.
Formerly “Highlight”
Related startups
Open-source, dev-friendly observability.
Delivery Analytics for Software Teams
