PageDog

PageDog is a local-first macOS app for monitoring exact website changes without repeatedly checking pages by hand. Select the part of a page that matters, define one testable goal—such as a price drop, an item returning to stock, tickets going on sale, or an appointment opening—and choose a schedule. PageDog runs checks through your local browser session and uses hosted AI to determine whether the goal happened. Browser sessions and check history stay on your Mac; only evidence from the selected page area is sent for AI evaluation. Built with Electron, React, TypeScript, Vite, Next.js, PostHog, and Vercel. The recurring free plan includes 20 completed AI checks per month.