Yes it’s possible and free, there’s a website out there it’s free service where you let it know which site or specific page have changes, then it will email or text you notifying you that the page has changes. The free service provided by https://www.changedetection.com/ basically paste the link you want to monitor then your email then submit, that’s it 🙂 This is helpful to me, when I see a product that I want to see price changes, I monitor it, just one example but you can use it for other purposes without the site owners you’re monitoring their site page activities 🙂