Launching July 21 — how do you keep an eye on competitor prices today?

I run a small product and kept finding out too late when a competitor dropped a price or launched a promo. By the time I noticed by hand, the sale was already gone.

So I built Speccyfox: you paste a competitor's page, and you get an email the moment a price or promo changes, with a clear before and after. It is EU hosted and GDPR ready, no code, no extension.

I am launching it here on Product Hunt on July 21. If it sounds useful you can follow the coming soon page: https://www.producthunt.com/products/speccyfox?launch=speccyfox

Genuinely curious how others handle this. Do you track competitor prices manually, with spreadsheets, or some tool? And what would make you actually trust an alert instead of checking yourself?