I would like to monitor a webpage and get alerts when certain keywords appears. Check4Change, that allows me to monitor web pages, alerts for every change but I am only interested in changes that contains specific words and in this specific case 99 % or so of the updates doesn't contain the words I am interested in so C4C isn't useful.

Browser extension or standalone software (preferable something that runs on a Mac) are both fine. Regarding web services that tracks page changes, I want to run this update every 15 minutes or something like that, and all web services I have seen cost money for updates that are that frequent, but if it exist a web service that is free, even for that short interval, such a solution would also be interesting.

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