Errandbird

Errandbird runs little agents that monitor pages, feeds and APIs, detect the changes you care about, and react — email you, file an event, or feed another agent in a chain.

Worth knowing before you commit:

• Agent chains compose into surprisingly capable watchers.
• Scraping-based agents need occasional maintenance as sites change.
• Everything it learns stays in your database, not a vendor's.

For the person who wants the internet watched, but on their own terms.