Попробовал WebChangeMonitor и PageProbe. Данное приложение понравилось больше. Хоть и отнимает постоянно часть ресурсов локального ПК. В отличие от PageProbe не требует постоянно открытого окна, зато, позволяет выбирать отслеживаемую область вебстраницы. Уведомление на кнопке, звуком и на email. Причем, в письме отображаются добавленные и удаленные элементы. Недостатки: даже бесплатный вариант ограничен всего 25 локальными отслеживаниями, и на части страниц рамка отслеживаемой области не видна, приходится отслеживать страницу целиком или лезть в код. В качестве альтернатив можно оценить Update Scanner и Otsledit.

Saves fingers in the battle against scalpers

This is a great addon! It helps me with my job a LOT! Works flawlessly!

Excellent app for tracking site updates when looking for in stock products. The $15 a month plan provides 50 trackers and SMS, and notifications to apps like Discord. Well worth your time and money if serious about getting a item before the bots take them all!

With a bit of tweaking you can be notified for just about anything chaning instantly. Perfect for today with just about everything being out of stock.

Incredibly useful for finding GPUs!

I initially tested out the free version, and it seemed to work really well. Then I decided to go for a month of paid, so I can use the SMS feature - turns out it wasn't working (at least for me) - I managed to pair my phone with the service but I never got any notifications. I have contacted them about the issue but no response.

I got distill because I've been trying for 2 months to purchase a computer component that is in very short supply and in incredible demand (nVidia 3080 GPU). I've been competing with bots and hundreds of thousands of people. I set up the free version of distill, and after a week and a little tweaking, I was monitoring over 15 different pages and getting near immediate stock updates. The result is that I caught an in stock item and secured it (it was in stock for perhaps 15 seconds). Thank you, thank you, thank you to this app.

Have been using this extension for years and it has been indispensable in monitoring changes and updates to web pages.

Nearly flawless monitoring of web pages. Awesome for being alerted when out of stock items become available.

Great way to track webpages updates!

Does a great job of detecting changes on a website so you can get alerted when what you want is in stock!

Helped me get a sold out video card!

Add does exactly what it says it does. Mark the part of a webpage you want to monitor, and it reliably informs you of updates. Good UI too.

This works so better with descent internet connection. Alerts are so accurate and hardly any notification missed on my use. Also it can load it in background by disabling JavaScript.
Perfect so far !

Incredibly useful. It's an extension I'd hate to be without as I have a lot of sites I need to keep an eye on and this does the job beautifully.

I'm not a web teccy but this was super easy to use. Unlike several others I tried the free version just worked with no cloud-dependent sign up issues. You can go down to as little as a 5-second interval running monitors on local device. Setup is easy point and click. Lots of ways to get notified - , popup, sound, email, SMS, push (last 2 require subscription but not expensive)

Brilliant so far, makes website monitoring easy

I am very helpful because I can get various information updates quickly.