Alerts you can read in the subject line
A lot of change alerts amount to “this page changed” plus a before-and-after screenshot. That's fine when you watch one page. Once you're watching twenty, you stop opening them.
ChangeGist writes a short summary of each change, like “Shipping is now free over $50, up from $35”. You can usually tell from the email subject whether it's worth a look.
We stay quiet about the boring stuff
Plenty of pages change every time you load them. A date in the footer, a visitor counter, a random customer quote. We filter that out, so your inbox only gets changes a person would care about.
Every change is still saved in the page's history if you want to double-check.
Watch the whole page or just one part
If you only care about one section, like a price table or a list of products, you can tell us to watch just that bit. Changes anywhere else on the page are ignored.