Do you need to check hundreds of websites if they are not broken after an update?
Do you need to wait for your clients to confirm you can do production deployment?
And you need to do that weekly or multiple times a week?
Run visual checks on multiple projects with just a few clicks.
Monitoring will take screenshots and compare them with screenshots of previous run (i.e. yesterday) so you just receive an email notificaiton if anything changed.
Build your own Safe-Updates workflow by integrating Diffy into your CI