Sentinel: A robot customer that checks your website, all day, the way a real buyer would.

A website can look “up” while the thing that makes money is broken: a buy button that goes nowhere, a form that will not send, a page that will not load on phones. Usually you only find out from lost sales or an angry email.

Example: a $9 “Buy” button that opens the $997 checkout. Every page still loads, so ordinary uptime checks stay green.

• Visits your key pages and buying steps on desktop and mobile, every hour
• Notices on its own when the site has been changed, and re-checks straight away
• Sends one clear alert per problem, with screenshots of what the visitor saw
• Keeps the problem open until a fresh check proves it is fixed
• Business controls: team sign-in, roles, audit trail, EU or US data storage
• Also checks the other four products are doing what they claim

A small online shop owner who cannot watch the site all day. A marketer launching a campaign page. An agency running many client sites. An engineering team that ships changes every week.