Tools: I Built an AI-Powered Website Monitor — Here's How It Works

The Problem ## The Solution: AI-Powered Selection ## Tech Stack ## How Change Detection Works ## Multi-Channel Notifications ## REST API for Developers ## Chrome Extension ## Internationalization ## What's Next ## Try It Out I've been working on PulseWatch — an AI-powered website monitoring tool that tracks changes on any webpage and sends instant notifications. I wanted to share how I built it and what makes it different from existing solutions. We all need to track changes on websites sometimes — price drops on Amazon, new job postings, API documentation updates, stock availability, or news articles. The existing tools either require complex CSS selectors or are too expensive for what they offer. PulseWatch uses GPT-4o to analyze web pages and suggest what to monitor. Instead of writing CSS selectors manually, you can: Here's what powers PulseWatch under the hood: The monitoring flow is straightforward: The AI summary is a game-changer — instead of just saying "something changed," PulseWatch tells you what changed in plain language. One of the most requested features was flexible notifications. PulseWatch supports: As a developer, I wanted PulseWatch to be API-first. The REST API lets you: Authenticate with an API key (X-API-Key header) and build your own integrations. Full docs at pulsewatch.watch/docs/api. I also built a Chrome extension that lets you add any website to PulseWatch directly from your browser. Right-click on any page → "Monitor with PulseWatch" → done. Available on the Chrome Web Store. PulseWatch supports 9 languages: English, Turkish, German, Spanish, French, Arabic, Japanese, Korean, and Chinese. The landing page, app, and even AI-generated change summaries are all localized. I'm currently working on: PulseWatch has a free tier (2 monitors, daily checks) so you can try it without commitment. Paid plans start at $8.99/month for more monitors, faster checks, and API access. 🔗 Website: pulsewatch.watch 📱 Chrome Extension: Chrome Web Store 📖 API Docs: pulsewatch.watch/docs/api I'd love to hear your feedback! What features would you find most useful? Drop a comment below 👇 Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse CODE_BLOCK: GET /api/watches — List all monitors POST /api/watches — Create a new monitor GET /api/watches/:id — Get monitor details DELETE /api/watches/:id — Delete a monitor GET /api/history/:id — Get change history Enter fullscreen mode Exit fullscreen mode CODE_BLOCK: GET /api/watches — List all monitors POST /api/watches — Create a new monitor GET /api/watches/:id — Get monitor details DELETE /api/watches/:id — Delete a monitor GET /api/history/:id — Get change history CODE_BLOCK: GET /api/watches — List all monitors POST /api/watches — Create a new monitor GET /api/watches/:id — Get monitor details DELETE /api/watches/:id — Delete a monitor GET /api/history/:id — Get change history - Point and click — Take a screenshot, click on the element you want to track - Drag to select — Draw a box around a region on the page - AI suggestions — Let GPT-4o analyze the page and recommend what to monitor - 40+ templates — Pre-built selectors for popular sites like Amazon, eBay, GitHub, and more - Backend: .NET 8, PostgreSQL, deployed on Railway - Frontend: Flutter Web + Mobile (iOS & Android), deployed on Vercel - AI: OpenAI GPT-4o for element detection, GPT-4o mini for change summaries - Screenshots: thum.io API for capturing page screenshots - Notifications: Brevo (email), Firebase Cloud Messaging (push), plus Slack, Discord, and webhook integrations - Error Tracking: Sentry for real-time error monitoring - Landing Page: Next.js with i18n support for 9 languages - User adds a URL and selects an element (via AI, visual selector, or template) - PulseWatch captures a screenshot and extracts the element content on a schedule - When content changes, it generates an AI summary of what changed - Notifications fire across all configured channels - Push notifications — iOS (APNs) and Web (FCM) - Email — Detailed change reports via Brevo - Slack — Channel-based alerts - Discord — Webhook integration - Custom Webhooks — POST requests to any endpoint - Quiet hours — Don't disturb during sleep - Public status pages for monitored sites - Weekly digest emails - Webhook retry mechanism - Onboarding flow improvements