Added to the site
PingWhen is live at pingwhen.app — paste a URL, get pinged when it changes or dies. Starter $9/mo and Plus $19/mo on Stripe.
PingWhen
Get an email or webhook when a web page changes. It also sends real-world alerts for vehicle and product recalls, food recalls by state, river levels, and tax sales. Free to start; Starter is $9/mo and Plus is $19/mo.