Error Monitoring & Session Replay
Stop guessing why bugs happen
Error Monitoring & Session Replay launched on January 10, 2023 with 269 votes, #89 of 3,901 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
Highlight is an error monitoring and session replay tool for web applications that helps developers identify and fix bugs by capturing detailed information about what went wrong. It combines error tracking with session replay capabilities, allowing developers to see exactly how users encountered issues. The tool is designed for development teams who want to move beyond guesswork when troubleshooting application problems.
written from the facts on this page · September 2026
From the sources
Error monitoring is a crucial aspect of maintaining any application, and we wanted to build the best error monitoring experience possible. We reimagined how error monitoring in Highlight works to build the best error management solution for web applications.
LaunchDarkly helps teams safely manage code and AI agents in production with feature flags, progressive delivery, automated rollback, and runtime control.
The runtime control layer for AI development, de-risking releases, and enabling systems that heal and optimize themselves. Progressively release changes and roll back instantly based on real-time impact. Automatically keep agents on track, mitigating bad behavior and steering responses in real time. Test prompts and models in production and dynamically route traffic to the best option. Instantly remediate failing code and misbehaving agents (without human intervention). Experiment with code and agents in production and optimize based on real-world results. Ship confidently with automatic recovery and continuous improvement built in. See end-to-end examples of building on the LaunchDarkly…from launchdarkly.com
Does a similar job
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We’re open-sourcing our session replay tool2023 · github.com · ▲408Hey HN! We’re open-sourcing highlight.io (https://github.com/highlight/highlight), a session replay and error monitoring tool. Highlight.io gives you a high-precision video-like replay of what users are doing when an error or exception occurs in your web app, along with a full-fledged error monitoring experience (similar to bugsnag, rollbar, etc..). The main value prop of highlight.io is that we help you understand the full context surrounding an error and allow you to drill down to the code path that a user invoked (i.e user clicked button X, sent network request Y, and…
Frontend Monitoring by Highlight2022 · launchdarkly.com · ▲141The best way to monitor the performance of your frontend
Highlight – Debug customer-facing issues with replay2022 · highlight.io · ▲21Hey HN, I’m Jay, a co-founder at Highlight and a YC alum; excited to share our replay-based debugging tool! TLDR; if you're using a tool like Fullstory for debugging, or you have trouble understanding the actual impact of your errors (e.g. in sentry), you should give us a try! We built Highlight because we constantly found ourselves flooded with errors and support tickets with very little context on why these issues occurred. To make matters worse, there was never an easy (and less annoying way) of reproducing these errors, other than by asking users to send screenshots, videos, etc.…
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