Price & Inventory Tracking
React to price drops, flash sales, and restocking events before your competitors do. Real-time web monitoring on any product page, anywhere on the internet.
The challenge
The data you need is public.
The alerts are not.
Prices and inventory change constantly across the web — and the teams that react fastest win. Manual checking doesn't scale past a handful of products. By the time a flash sale or competitor price drop appears in a report, the opportunity is gone.
Why DiffHook
CSS precision on the price element
Target exactly #price-block or .product-price so irrelevant layout changes don't trigger alerts. You get clean signal, not noise.
Catch flash sales within minutes
5-minute polling on paid plans means you see time-limited promotions before they expire — not hours later when the window has closed.
Automatic price history logging
Every detected change is timestamped. Route to Airtable or Google Sheets to build a price history database automatically — no extra code.
Trigger repricing and buy workflows
Connect price alerts to n8n or Make to automate repricing, purchase decisions, or inventory actions downstream without manual intervention.
How it works
Three steps to production
Target the price element
Use a CSS selector to isolate the exact price or stock element — #corePriceDisplay, .product-price — so irrelevant page changes don't generate noise.
Set a fast interval
Price monitoring often needs 5–15 minute polling to catch flash sales and time-limited offers before they expire.
Trigger your automation
Route the change event to a Slack alert, a repricing workflow, a buy trigger, or a price history log — automatically.
Use cases
What teams build with this
Competitive repricing
Webhook → Repricing APIMonitor competitor product pages and trigger your repricing workflow automatically the moment they change prices — before your margin erodes.
Restock alerts
n8n → SMS alertWatch out-of-stock pages and get notified the moment a high-demand product returns to inventory — for purchasing or resale decisions.
Flash sale detection
Zapier → SlackCatch time-limited promotions on competitor sites within minutes — not hours — with 5-minute polling before the sale window closes.
Price history logging
Webhook → AirtableBuild a complete price history database by logging every detected change with a timestamp to Airtable, Sheets, or your own database.
FAQ
Frequently asked questions
Start monitoring in minutes
Free tier includes 3 active monitors. No credit card required. Your first monitor is one API call away.
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