Highlight

In plain words

Highlight is a developer tool that records and replays user sessions in web applications to help teams identify and fix issues affecting customer experience. It provides pixel-perfect session replay functionality, giving developers full visibility into user interactions and problems. The tool is designed for product teams and developers who want to monitor application stability and understand user behavior directly.

written from the facts on this page · September 2026

From the sources

Highlight keeps your web app stable and your customers happy! With pixel-perfect session replay, you'll get full visibility into the issues and interactions that are slowing down your users. For Product Hunt users, we're gifting 4 months of Highlight for free!

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

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  Error Monitoring & Session Replay2023 · launchdarkly.com · ▲269

  Stop guessing why bugs happen

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  We’re open-sourcing our session replay tool2023 · github.com · ▲408

  Hey 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…

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  Highlight2022 · launchdarkly.com · ▲285

  Understand and debug customer issues with confidence

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  Frontend Monitoring by Highlight2022 · launchdarkly.com · ▲141

  The best way to monitor the performance of your frontend

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  Comments by Highlight2022 · ▲180

  Collaboration on Highlight makes debugging faster than ever

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  Highlight – Debug customer-facing issues with replay2022 · highlight.io · ▲21

  Hey 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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