PageDogWhen an appointment slot, ticket release, or booking calendar matters, it is tempting to build a very clever monitor. Most of the time, cleverness is not the bottleneck.
Watch the place, not the meaning
A page can change its wording, markup, or layout without changing its intent. PageDog takes the more modest approach: you point to an area and it alerts you when that area looks meaningfully different.
A small promise is a useful promise
The app does not claim to understand the page or decide whether a new appointment is available. It says only: something changed here. That leaves the important judgement with the person who knows what they are waiting for.
Fewer moving parts
Visual monitoring also avoids asking people to learn selectors, XPath, regular expressions, or an automation language. Select a rectangle, choose an interval, and let the local app do the quiet repetitive part.