change detected
Diffwatch monitors competitor product pages, inventory status, and category copy — and emails you a smart AI diff the moment anything changes in your niche.
Drop in any competitor's product page or category listing. Works on any public storefront — no browser extension or API key needed.
Use the CSS selector mode to watch only price and inventory elements, not the whole page. Cuts noise to near-zero on dynamic storefronts.
When Diffwatch sees a change, it emails you a plain-English summary: which product changed, what the old price was, what it is now.
Diffwatch fetches rendered HTML, so client-side price and stock updates are captured in most cases. Works on Shopify, WooCommerce, BigCommerce, and most brand D2C stores.
Yes. Set up a separate watch per URL. Pro users can monitor unlimited product and category pages simultaneously.
Free plan checks every 60 minutes. Pro plan checks every 5 minutes — fast enough to catch flash sales, stealth price cuts, or surprise sell-outs.
The REST API supports programmatic watch creation — you can loop through a CSV of product URLs and create a watch for each in a few lines of code. See /docs/api.