Website monitoring for developers

Track front-end performance and quality metrics for your production site and in CI.

Compare results and see what caused the problem.
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Front-end web performance monitoring dashboard

Keep your website fast

User-centric performance metrics

Track user experience based metrics like First Contentful Paint, Speed Index, and Time to Interactive.

Track CPU and memory consumption

See how client-side code execution impacts performance.

Monitor Lighthouse scores

Track the scores provided by Google's Lighthouse tool for performance, accessibility, best practices, and SEO.

Lighthouse monitoring tab
Per-file size history chart

Take action

Performance recommendations

Improvement opportunities tailored to your website. View a full Lighthouse quality report for each analysis.

Bundle size monitoring

Wondering what part of your JS code just got larger? DebugBear will tell you exactly what file changed. If you have a JavaScript bundle with a hash in the file name DebugBear will detect that and track size changes for that bundle.

Access past page versions

Trying to figure out when a bug was introduced or how a feature used to work before? Load a fully interactive archive of the old page version in your browser.

How it works

Nothing to install

Just enter the URLs of the pages you want to monitor and we'll do the rest.

Share results with your team

Invite as many users as you like, so everyone has access to performance data. Or share give everyone access with a shareable URL.

Configure device type and location

Select whether you want to monitor mobile or desktop performance, and select the network region where your users are located.

Advanced features

Access pages behind authentication. Disable GDPR notices with custom scripts. Block third-party requests to monitor just your own code. Set performance budgets to keep your site fast.

resource size history chart
web performance email alert

Intelligent alerts

Automatic change notifications

Did you JavaScript bundle get bigger? Got a slow server response? Added a new image without an alt tag? Using a deprecated API? All of these can trigger an alert.

Detailed change information

See exactly what file, metric, or Lighthouse audit changed – and why!

Get alerts by email or in Slack

Set up alerts in the way that's most convenient to you.

Continuous Integration


Use the command line interface to analyze each build and catch regressions early. Deploy to a staging server or use ngrok to allow access to your CI server.

Github integration

Report results for each commit to Github.

resource size history chart

Get set up in minutes.

No changes to your website necessary.
Start free 30-day trial
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