Web scraping that fixes itself when sites change.

Two ways out, both built in

LumaBrowser ships with two strategies for surviving a redesign — pick whichever fits your target site, or use both. Both are free, both run locally.

curl -X POST http://localhost:3000/api/browser/tabs/0/get_element \
  -H "Content-Type: application/json" \
  -d '{
    "selector": ".product-price",
    "llmFallback": "the visible price next to the buy button"
  }'

curl -X POST http://localhost:3000/api/network-watcher \
  -H "Content-Type: application/json" \
  -d '{
    "urlPattern":  "*/api/products/search*",
    "forwardTo":   "https://your-webhook.example.com/products"
  }'

End-to-end: a price scraper that survives a redesign

One Python script. Open the page, extract the price with a CSS selector, fall back to a description if the class changed. Same script keeps running through the next ship-week.

import requests

API = "http://localhost:3000/api/browser"

# 1. Open the page in a real Chromium tab.
tab = requests.post(f"{API}/tabs", json={
    "url": "https://acme-shop.com/products/widget-pro"
}).json()["id"]

# 2. Read the price. CSS path first, LLM fallback if the class moved.
price = requests.post(f"{API}/tabs/{tab}/get_element", json={
    "selector":    ".product-price",
    "llmFallback": "the visible price next to the buy button"
}).json()["text"]

# 3. Same shape both ways — the call returns text either way.
print("current price:", price)

const API = 'http://localhost:3000/api/browser';

// 1. Open the page.
const { id: tab } = await fetch(`${API}/tabs`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ url: 'https://acme-shop.com/products/widget-pro' })
}).then(r => r.json());

// 2. CSS path first, LLM fallback if it misses.
const { text: price } = await fetch(`${API}/tabs/${tab}/get_element`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
        selector:    '.product-price',
        llmFallback: 'the visible price next to the buy button'
    })
}).then(r => r.json());

console.log('current price:', price);

# Open the page
curl -X POST http://localhost:3000/api/browser/tabs \
  -H "Content-Type: application/json" \
  -d '{"url": "https://acme-shop.com/products/widget-pro"}'

# Read the price — CSS first, LLM fallback if the class moved
curl -X POST http://localhost:3000/api/browser/tabs/0/get_element \
  -H "Content-Type: application/json" \
  -d '{
    "selector": ".product-price",
    "llmFallback": "the visible price next to the buy button"
  }'

Where LumaBrowser sits in the scraping stack

Most paid scraping APIs charge per request and bill JavaScript-rendered pages at higher multiples. Most open-source frameworks have no self-healing. LumaBrowser is the local-app option that closes both gaps.

Pricing as listed by each vendor at time of publication. Cloud scraping APIs typically charge more for JavaScript-rendered pages, premium proxies, or anti-bot bypass — the listed entry price is the floor, not the typical bill. LumaBrowser's free tier ships with anonymous app analytics; see what we collect.

This comparison reflects publicly available pricing and feature information gathered to the best of our knowledge from each vendor's public materials. Vendors update plans frequently and we're a small team — if anything here looks wrong, please email [email protected] with the correction and a source, and we'll update the page.

The maintenance math