# Bulk Lighthouse Audit: Core Web Vitals, SEO & Accessibility (`devotee/bulk-lighthouse-audit`) Actor

Run Google Lighthouse on hundreds of URLs at once. Get performance, accessibility, best-practices and SEO scores, Core Web Vitals, and the top fixes for every page, mobile and desktop.

- **URL**: https://apify.com/devotee/bulk-lighthouse-audit.md
- **Developed by:** [Thomas Peckham](https://apify.com/devotee) (community)
- **Categories:** SEO tools, Developer tools
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $20.00 / 1,000 lighthouse audits

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## Bulk Lighthouse Audit

Run **Google Lighthouse** on hundreds of URLs in one go and get a clean table of scores, Core Web Vitals, and the fixes that matter most for every page, on mobile and desktop.

Lighthouse is the open-source engine behind PageSpeed Insights and Chrome DevTools audits. This Actor runs it in the cloud for you, one page at a time so results stay consistent.

### What you get for each URL

- **Scores (0–100):** Performance, Accessibility, Best Practices, SEO.
- **Lab metrics:** Largest Contentful Paint, Cumulative Layout Shift, Total Blocking Time, First Contentful Paint, Speed Index, Time to Interactive.
- **Core Web Vitals ratings:** good / needs improvement / poor for LCP, CLS and TBT (the lab stand-in for INP).
- **Top fixes:** the performance issues with the biggest estimated time and byte savings, ranked.
- **Optional full HTML report** for each audit.
- **Optional real-user data:** add your own Google API key to include Chrome UX Report field data (75th percentile LCP, INP, CLS, FCP, TTFB) and a pass/fail verdict.

### Use cases

- Audit a whole site or a list of landing pages before and after a release.
- Monitor Core Web Vitals weekly with a schedule and catch regressions.
- Compare your pages against competitors'.
- Produce client-ready SEO and accessibility audits for agencies.

### Input

| Field | What to enter |
|---|---|
| URLs | One per line, up to 500 per run |
| Device | Mobile, desktop, or both |
| Categories | Any of Performance, Accessibility, Best practices, SEO |
| Save full HTML reports | Store and link the full Lighthouse report |
| Your Google API key | Optional; enables real-user field data |

### Output

```json
{
  "url": "https://example.com/",
  "strategy": "mobile",
  "finalUrl": "https://example.com/",
  "scores": { "performance": 37, "accessibility": 95, "bestPractices": 77, "seo": 100 },
  "metrics": { "largestContentfulPaintMs": 4468, "cumulativeLayoutShift": 0.57, "totalBlockingTimeMs": 1421, "firstContentfulPaintMs": 1266, "speedIndexMs": 2592, "timeToInteractiveMs": 14487 },
  "labVitals": { "lcp": "poor", "cls": "poor", "tbt": "poor" },
  "opportunities": [
    { "id": "bootup-time", "title": "Reduce JavaScript execution time", "estimatedSavingsMs": 1400, "estimatedSavingsBytes": null },
    { "id": "unused-javascript", "title": "Reduce unused JavaScript", "estimatedSavingsMs": 640, "estimatedSavingsBytes": 224809 }
  ],
  "failedAuditCount": 18,
  "fieldData": null,
  "htmlReportUrl": null,
  "lighthouseVersion": "13.5.0",
  "auditedAt": "2026-10-17T12:00:00.000Z",
  "error": null
}
```

### Pricing

Pay per completed audit (one URL on one device). Failed audits, such as pages that don't load, aren't charged. Set a maximum charge per run to cap spending.

### Notes

- Lab results use Lighthouse's standard simulated throttling, so scores are comparable between runs, though they can differ slightly from PageSpeed Insights, which runs on Google's own machines.
- Only audit sites you own or have permission to test. Each audit loads the page once, like a normal visitor.

### Data sources and terms

- Audits run the open-source [Lighthouse](https://github.com/GoogleChrome/lighthouse) (Apache 2.0) on Apify's servers. No Google API is called on your behalf unless you add your own key.
- Real-user data comes from the Chrome UX Report API only when you supply your own Google API key, under your own agreement with Google.

# Actor input Schema

## `urls` (type: `array`):

Pages to audit, one per line (up to 500). URLs without http(s):// get https:// added. Only audit sites you own or are allowed to test.

## `strategies` (type: `array`):

Mobile emulates a mid-range phone on a throttled connection (Lighthouse defaults); desktop uses Lighthouse's desktop settings. Each URL × device is one billed audit.

## `categories` (type: `array`):

Which Lighthouse categories to score.

## `saveHtmlReports` (type: `boolean`):

Store the complete Lighthouse HTML report for each audit and link it from the results.

## `googleApiKey` (type: `string`):

Add your own Google Cloud API key with the Chrome UX Report API enabled to include real-user Core Web Vitals (75th percentile) for each URL or its site. Requests run under your key and Google's terms. No extra charge.

## Actor input object example

```json
{
  "urls": [
    "https://example.com"
  ],
  "strategies": [
    "mobile"
  ],
  "categories": [
    "performance",
    "accessibility",
    "best-practices",
    "seo"
  ],
  "saveHtmlReports": false
}
```

# Actor output Schema

## `results` (type: `string`):

One row per URL per device: scores, lab metrics, Core Web Vitals ratings, top fixes and optional field data.

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "urls": [
        "https://example.com"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("devotee/bulk-lighthouse-audit").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "urls": ["https://example.com"] }

# Run the Actor and wait for it to finish
run = client.actor("devotee/bulk-lighthouse-audit").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "urls": [
    "https://example.com"
  ]
}' |
apify call devotee/bulk-lighthouse-audit --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,devotee/bulk-lighthouse-audit"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/w4keUEdldKSvOtBTx/builds/2bbL3vG5ijynkCfW8/openapi.json