ChangeTower
Monitor website changes, get alerts, archive full history. ChangeTower is a powerful website change detection and archiving platform. Set custom alert criteria, monitor and track website changes, get notified. Choose a URL to monitor for web page changes or set for archival. Our engines will crawl and capture a full-page visual screenshot, text-based content snapshot, and source code. Our powerful change monitoring network tracks changes to websites over time. We notify you when we detect a change matching your settings and record and archive a snapshot of your page automatically. Select a part of the page to monitor for visual changes, or choose to monitor for keywords, sentences, code updates, images and more. Create advanced sets of criteria to monitor for. You decide what element(s) of a web page to monitor, and when to send you change alerts.
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changedetection.io
From simply monitoring website pages that have a change (such as watching prices, or restock notifications), to deep inspection such as PDF text support, JSON and XML monitoring, and extensive text triggers. Monitor out-of-stock products and get alerts when those products are back in stock, get restock alerts via Discord, Slack, email, and many other platforms. Perform searches, log in with username and password, add to cart, interact with fields, buttons and many more possibilities.
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WebSite-Watcher
WebSite-Watcher is a powerful yet simple website-monitoring tool, perfectly suited to the beginner and advanced user alike. This software places you in complete control over what gets checked, when it gets checked, and even how you are notified. The Follow-links feature allows you to monitor complete websites instead of single pages. Linked pages will automatically be inserted as new bookmarks. The logic of bookmark checks can be enhanced with the integrated plugin system. For example to monitor a page for a specific price and alert only an update if the price is within a certain price range. Plugins can be written with the integrated programming language basic. Archive updated pages permanently with our add-on local website archive and keep a history of previous changes.
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Verid
Verid is a developer-first web change detection API for monitoring any webpage for changes through structured data, not screenshots. Instead of alerting when a page visually changes, Verid extracts the exact field you care about, such as price, version, stock status, API response value, or availability, then fires a webhook only when a predicate you define is true. It is built for state monitoring, not screenshot diffing, giving developers structured extraction, durable state, field-level diffing, and predicate-driven delivery in one loop. Every monitor runs on a schedule you set through a full REST API with an OpenAPI 3.1 spec, so teams write the configuration while Verid runs the infrastructure. The pipeline follows five stages; fetch, extract, diff, predicate, and deliver. Verid starts with static fetch, automatically falls back to a headless browser when needed, and can escalate to a residential proxy when a site is harder to access.
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