I'm interested in an app that allows users to monitor webpages for the existence of user-specified keywords, and get notified when these keywords are detected. I was originally using VisualPing (to check when Amazon listings went live, for example), but I find myself needing a little more specificity when it comes to checking WHAT is changing. Are there any apps that can do this? I'd prefer something like a Chrome extension or something that can send me an email/text message whenever the first time the keyword is detected (in context). I'm okay with false positives/repeated reports, as I can always just check the site manually myself as well. I can provide a sample use case, if that would help, as well:
keywords: "pbt", "spacebar", "pbt spacebar"
Notify on refresh if any of the above is detected. Notice that the webpage updates often, so I can't rely on something like VisualPing, which detects if a space undergoes changes.