What is Lighthouse?
Lighthouse is Google's open-source automated tool for auditing web page quality, performance (Core Web Vitals), accessibility, SEO, PWA, and best practices. It runs in Chrome DevTools, the PageSpeed Insights web tool, and the lighthouse CLI. It's the canonical scoring engine for Google's web-perf signals: when a tool reports a "Lighthouse score," this is what it ran. As a free local-first tool, Lighthouse is unbeatable for one-off page audits during development. Where it falls short for production teams: no scheduled runs, no historical trending, no alerting, no multi-region coverage, no load testing, and you have to remember to run it.
When Lighthouse alone is enough
- You're a solo developer auditing a page during a feature build.
- You need a one-off Core Web Vitals snapshot before a release.
- You're comfortable wiring lighthouse-CI into your build pipeline yourself.
Where Lighthouse leaves gaps
- No scheduling. Lighthouse runs when you tell it to. Catching regressions in production requires you (or a CI job you build) to run it on a cadence.
- No historical trending. Each run is a snapshot, no built-in chart of LCP-over-time across the past 30 days.
- No alerts. Score drops 20 points after a deploy? Lighthouse doesn't tell you. You discover it next time you manually run it.
- Single-location. Local Lighthouse runs from your machine. PageSpeed Insights runs from one Google data center. Real users hit your site from dozens of geographies.
- No load testing. Lighthouse measures one page-load in isolation; it doesn't simulate concurrent traffic.
- Manual. Every run is a manual or scripted invocation. At team scale, this becomes a process tax.
LoadFocus vs. Lighthouse: comparison
| Feature | LoadFocus | Lighthouse (raw) |
|---|---|---|
| Lighthouse audit engine | Yes, same canonical engine | Yes (it IS Lighthouse) |
| Scheduled runs | Yes, hourly/daily/weekly | No |
| Historical trending | Yes. 30/90-day charts | No |
| Alerts on regression | Yes, email/Slack/webhook | No |
| Multi-region coverage | 26+ AWS regions | Single (your machine) |
| Load testing alongside | Yes. JMeter + k6 | No |
| API monitoring | Yes | No |
| Setup effort | Sign up + paste URL | npm install + script + cron + storage + UI |
| Free tier | Forever, limited runs/mo | Forever, manual only |
When LoadFocus is the right pick
- You want Lighthouse audits on a schedule instead of remembering to run them.
- You need history + trends to spot Core Web Vitals regressions over time, not just snapshots.
- Your team needs alerts when LCP/INP/CLS degrade past a threshold, typically post-deploy.
- You want multi-region testing to see how your site performs from where your real users actually are.
- You want load testing on the same platform: measure not just one isolated page-load, but performance under realistic concurrent traffic.
Migrating from Lighthouse-only workflow
- Identify your critical URLs: landing pages, top-converting product pages, user dashboards.
- Schedule LoadFocus speed tests on those URLs daily (or hourly for high-traffic pages).
- Set Core Web Vitals thresholds: alert when LCP > 2.5s, INP > 200ms, CLS > 0.1.
- Keep local Lighthouse for ad-hoc dev-time debugging, it's unbeatable for that.
- Wire LoadFocus into CI via API call to fail builds on regression.
FAQ: LoadFocus vs Lighthouse
Does LoadFocus use the same Lighthouse engine?
Yes. LoadFocus runs Google's open-source Lighthouse under the hood. Same scores you'd see in Chrome DevTools or PageSpeed Insights, just scheduled, charted, and alerted.
Why pay if Lighthouse is free?
Lighthouse the engine is free. The infrastructure to run it on a schedule from multiple regions, store results, chart history, and alert on regression is the value-add LoadFocus charges for. For a single dev hand-running occasional audits, free Lighthouse is fine. For a team owning a production site, you'll save more in alert-time-to-detection than the subscription costs.
Can I get the raw Lighthouse JSON output?
Yes, every LoadFocus speed-test run exposes the full Lighthouse JSON via API. Useful if you want to feed it into Datadog or your own dashboards.
What about lighthouse-CI?
lighthouse-CI is Google's open-source CI integration. If you have engineering bandwidth to set it up + maintain it + build storage + dashboards, it's a strong choice. LoadFocus is the managed-service alternative.
Does LoadFocus support custom Lighthouse configs?
Most production-relevant settings (form factor: mobile vs desktop, throttling profile, locale) are exposed in the LoadFocus UI. Niche custom configs (custom Gatherers, audits) require contacting support.
What about PageSpeed Insights?
PageSpeed Insights is also Lighthouse-based. Google's free hosted version. PSI runs on-demand from one Google data center; LoadFocus runs scheduled from 26+ AWS regions with full history. They complement.
Get started with LoadFocus
Sign up free and run your first scheduled website speed test. Lighthouse on autopilot, with the multi-region coverage + alerts that local Lighthouse can't give you.
