Working totally fine and free for me in 2023.

Does what it says out of the box. Thanks to the developer!

In 2022, I used Check4Change to help me monitor newly-listed tickets and price drops on tickets at StubHub. With this extension's help, I was able to snag a music concert ticket to my favorite singer of 2021, Gracie Abrams.

Does what it does perfectly. I'm an author and use it to know when my sales figures update. Hearing the "Ch-ch-ch-changes" jingle is always a delight :)

Works great, but you must first select the text you want to check for changes and then click on the c4c icon.

David Bowie - Changes
December 1971

This is a solid Addon

A wonderful add-on.

This extension is extremely valuable to me and has enabled me to capture and take advantage of changes that occur every second...awesome!!!

Sehr gutes Tool. Benötigt ein wenig Einarbeitungszeit, aber ist es wirklich wert. Greetings from Germany.

very simple to use and really convenient

Very good for monitoring server status change for a game (waiting for maintenance to end, for example).

简单有效

When it works, it's amazing. There's to my knowledge no other tool like this one to keep track of reservation spots and such on websites.
Lately, been having issues with mailing system and site appears to be down.