Know of any FREE website change detection sites?

[Bob]

I was using one for years that was free but they got bought out by a paid company. 

I'm looking for something that's either software or a website/account where you put in the webpage URL and it tells you when the page changes, checking maybe once a day.

Know of anything?  And free.  I'm not paying for that.  It's nice but... I just don't want to pay, esp. if I had it free before.