# New Competitor Website Change Tracker Tool Launched A developer created a tool to monitor competitor updates via public sitemaps. - **Source:** [Hacker News: Show HN](https://news.ycombinator.com) - **Published:** 2026-11-09 - **Topic:** [technology](https://brifing.si/c/technology) - **Original article:** - **On Brifing:** https://brifing.si/s/95532f99-47d8-4a13-a9eb-d6b8a58f1c76 ## Automated Competitor Monitoring A recently laid-off developer launched a new tool designed to track website updates. By analyzing public sitemaps, the platform identifies pages added or modified within the last 30 days. This service provides users with a snapshot of competitor activity, including new pricing pages, product launches, and industry-specific content updates. ## Strategic Intelligence Utility The tool serves as a signal for business planning, helping users prepare for sales calls or internal strategy meetings. By monitoring changes before official announcements, companies can gain insights into competitor roadmaps. The service aims to turn raw sitemap data into actionable intelligence regarding market positioning and product development shifts. ## Sitemap Parsing Mechanism The platform operates by reading public sitemap files, which list pages and their last update timestamps. It strictly avoids private data, logins, or form submissions. The system respects robots.txt directives and limits requests to one per second, ensuring ethical data collection practices while maintaining a clear, identifiable user agent. ## Data Accuracy Limitations Users should treat the provided data as a strong hint rather than absolute proof. Some websites update all timestamps during redeployments, while others fail to update them at all. The developer notes that sitemap reliability varies significantly across different platforms, requiring users to interpret the results with a degree of caution. ## Weekly Briefing Service Beyond the basic snapshot, the platform offers a weekly briefing sent every Monday. This service compares actual sitemap snapshots week-over-week to filter out noise. It reports only pages that genuinely appeared or disappeared, providing context on what these specific changes likely mean for the user's competitive landscape and business strategy. ## Access and Constraints The tool is currently available for free, allowing users to monitor up to five competitors simultaneously. If a website blocks automated access via robots.txt or lacks a discoverable sitemap, the crawler will not scan it. This ensures the service remains compliant with standard web protocols and avoids potential legal or technical conflicts. ## Filtering Meaningful Changes The weekly email service is designed to be concise, skipping weeks where no meaningful changes occur. This approach prevents information overload for busy professionals. By focusing on significant updates, the platform helps users determine whether a change is worth their attention or if it is merely a routine technical site maintenance. ## Developer Context This project emerged following the developer's personal experience with a layoff, highlighting a trend of independent builders creating niche B2B tools. By focusing on public data, the project avoids complex privacy issues. It demonstrates how simple, targeted data analysis can provide significant value in competitive intelligence for small and medium-sized businesses. ## Sources covering this story - https://lifeadminpilot.com/tool — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._