Distill.io
Distill checks webpages in the cloud using servers or locally on your computer using browser extensions. Whenever there is a change, Distill will notify you of the change. The iOS app lets you get push notifications from local and cloud monitors instantly. The Watchlist and history view lets you view the changes with great detail. Distill doesn't check the web pages on your phone, so it doesn't affect your phone's battery. The app is a client to view and manage your Watchlist and get push notifications.
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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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Web Alert (Website Monitor)
Web Alert lets you monitor any website (or specific parts of it) you wish in order to be notified when it is updated. It even works when a login, a form post or a password prompt is necessary to access the site. For example, get notified when a price changes, a new article is published, you receive exam results or an answer in a forum, a registration period has opened, etc. You can also check if your own website is currently online and working correctly, or use it for UI testing and web monitoring. You navigate with its special browser to the webpage and the app tracks your navigation steps so that these can be repeated later in the background automatically. On the page you select the text (or HTML) visually that you want to watch for updates so you receive only notifications for modifications in these parts.
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OnWebChange
OnWebChange even allows you to select specific parts, even multiple different parts of a web page. You can set the tracker frequency and many other advanced options. Receive notifications to your phone, email, URL callbacks and more. You can configure logic filters and many other options. Track online product prices and get notified when the latest mobile phone drops in price. Keep an eye on your competition by tracking their prices, services, press releases and even T&Cs. Get notified when changes to legislation, policy or guidelines are published. Track the weather, and get notified if UV or pollen levels get too high.
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