Web App Monitoring/Synthetics

Has anyone had any success on finding a solution for this that doesn’t require a agent since we don’t really have access to that?

I was hoping to find something to just at a very basic level monitoring web app response rates and some other stuff but most of the ones I’m finding I use in my day to day all require agents on a server, etc.

Wondering if anyone has already done something similar or found a good product/service.

I use uptimerobot.com.

I created an http endpoint that does nothing and I added it to my list of uptimerobot endpoints.

The free plan is enough for me.