Lighthouse Audit API

Use this lighthouse audit API to run Google Lighthouse on public web pages and get one clean JSON row per URL with performance, accessibility, best practices and SEO scores, Core Web Vitals and the top fixes, for $15.00 per 1,000 audits.

Paste a list of page addresses, choose mobile, desktop or both, and start the run. Each URL is opened in a real Chrome browser and tested with Lighthouse. You get flat rows you can sort in a table, send to a spreadsheet or compare from one run to the next. You need no Google API key and no login. The Actor runs Lighthouse itself, so there is no quota to hit.

Sample output

One row per URL and device. This is a real row from a run on 4 October 2026. The page was a small test page served on the test machine, so your values will differ:

{
  "inputUrl": "http://127.0.0.1:8780/",
  "url": "http://127.0.0.1:8780/",
  "strategy": "mobile",
  "status": "ok",
  "performanceScore": 73,
  "accessibilityScore": 80,
  "bestPracticesScore": 96,
  "seoScore": 82,
  "fcpMs": 1179,
  "lcpMs": 15185,
  "lcpRating": "poor",
  "cls": 0,
  "clsRating": "good",
  "tbtMs": 0,
  "tbtRating": "good",
  "speedIndexMs": 2231,
  "serverResponseTimeMs": 18,
  "totalByteWeight": 2883193,
  "requestCount": 5,
  "opportunities": [
    { "id": "image-delivery-insight", "title": "Improve image delivery", "savingsMs": 13950, "savingsBytes": null, "summary": "Est savings of 2,784 KiB" },
    { "id": "render-blocking-insight", "title": "Render-blocking requests", "savingsMs": 400, "savingsBytes": null, "summary": "Est savings of 420 ms" }
  ],
  "lighthouseVersion": "13.5.0",
  "auditedAt": "2026-10-04T18:15:02.218Z"
}

How to run a lighthouse audit with this Actor

1. Click Try for free. No API key is needed.
2. In URLs to audit, enter one public page address per line. A missing https:// is added for you.
3. Choose Device: mobile (the default), desktop, or both.
4. Click Start, open the Overview view, and export as JSON, CSV or Excel.

Typical uses:

• SEO and web teams check the Core Web Vitals of the key pages of a site every week.
• Agencies audit a client's pages before and after a release and keep the rows for the report.
• Developers add a performance check to a pipeline and fail a build when a score drops.
• AI agents ask for the scores of a URL and get a flat answer instead of the full Lighthouse report, which runs to hundreds of kilobytes.

What you get

Group	Fields
Page	inputUrl, url (after redirects), strategy (mobile or desktop), status
Scores	performanceScore, accessibilityScore, bestPracticesScore, seoScore (0 to 100)
Core Web Vitals	lcpMs and lcpRating, cls and clsRating, tbtMs and tbtRating
Speed details	fcpMs, speedIndexMs, serverResponseTimeMs, totalByteWeight, requestCount
Top fixes	opportunities: up to 10 fixes ranked by estimated time saved, with title, savingsMs, savingsBytes and a short summary
Run details	lighthouseVersion, auditedAt, runWarnings, htmlReportUrl (only when you ask for the full report)
Errors	errorCode and errorMessage when a page could not be scored

The ratings use the usual Web Vitals limits: LCP good up to 2.5 s and poor over 4 s, CLS good up to 0.1 and poor over 0.25, TBT good up to 200 ms and poor over 600 ms. Total Blocking Time stands in for responsiveness, because Lighthouse tests in a lab and cannot measure real user interaction.

Pricing

You pay per scored audit, plus a start fee of $0.00005 for each run. One audit is one URL on one device that returned scores.

• Free plan: $0.015 per audit, which is $15.00 per 1,000.
• Bronze, Silver and Gold plans pay 10, 20 and 30 percent less per audit.
• You are charged only when Lighthouse produced scores. Every error row is free. This covers a malformed address, a private or local address, a host name that does not exist, a 404 or other error page, a file that is not HTML, a page that does not finish loading, a security warning, a redirect to a private address, and an audit that failed on our side after one retry.
• Set a maximum cost per run in the run options. The Actor stops when it is reached and keeps what it saved.

Worked example: 100 URLs on mobile and desktop are 200 audits. If all of them are scored, that costs 200 x $0.015 = $3.00, plus $0.00005 for the start. If 10 of the 200 return an error row, you pay for 190.

Input example

{
  "urls": ["https://example.com/", "https://example.com/pricing"],
  "strategy": "both",
  "maxOpportunities": 5,
  "saveHtmlReport": false
}

Settings you can change: Top fixes per audit (0 to 10), Save full HTML report (adds a link to the complete Lighthouse report in each row), Parallel audits (1 to 4, default 2) and Page timeout (20 to 180 seconds, default 60).

Error row example

{
  "inputUrl": "https://example.com/missing-page",
  "url": null,
  "strategy": "mobile",
  "status": "error",
  "errorCode": "ERRORED_DOCUMENT_REQUEST",
  "errorMessage": "The page answered with an error status (for example 404 or 500), so no score could be calculated.",
  "performanceScore": null,
  "opportunities": []
}

FAQ

Is it legal to audit a page?

The Actor opens only the public addresses you list, once per audit, like a visitor with a browser. It does not log in, follow links or collect personal data, and it refuses private and local network addresses, including IPv6 forms of them, and drops a result if the page redirects to one. The address is checked before Chrome loads it and again after redirects, so a host that changes its DNS answer between the two steps is a residual risk. Lighthouse is open-source software under the Apache 2.0 license. Audit pages you own or have permission to test, and check that your use follows the rules of the sites you test.

Why did the same page score differently on two runs?

Lighthouse is a lab test. Network timing and machine load move the numbers a little. In our tests the same page scored 73 once and 75 another time. Compare scores from the same device and the same settings, and repeat an audit before you act on a small change.

How is this different from PageSpeed Insights?

PageSpeed Insights runs Lighthouse on Google servers and adds field data from real Chrome users. This Actor runs Lighthouse itself and returns lab data only. In return you need no API key, there is no quota, and the rows are flat.

Can it audit pages behind a login?

No. Only public pages are supported. A page that redirects to a sign-in form is scored as the sign-in form.

Are error rows charged?

No. A URL that cannot be scored returns an error row with a code and a plain message, and it costs nothing. The start fee of $0.00005 still applies to the run.

What does the device setting change?

Mobile uses the standard Lighthouse phone profile with a slow 4G connection and a slowed CPU. Desktop uses a wide screen and a fast connection. Mobile scores are usually lower.

How many URLs can I audit in one run?

Up to 500 URLs per run. With both devices that is up to 1,000 audits. Larger lists can be split over several runs.

How long does a run take?

Each audit loads the page in a real browser, so it takes tens of seconds, not milliseconds. Two audits run at the same time by default, and the Actor lowers that number when the run has less memory.

What if a run stops in the middle?

The Actor saves each row as soon as it is done. If the run is moved to another server it continues with the URLs that were not finished and does not charge twice.

Related Actors

Other website and SEO tools by the same author are listed on the author's profile.

About this Actor

I built this Actor as an independent developer. It is not affiliated with, endorsed by or approved by Google. Lighthouse is an open-source project under the Apache 2.0 license.