Uptime monitoring service - do you like the one you use?

Really considering releasing the uptime monitor I built. Thing is, there is a lot of others on the market. Wondering if others are of interest or not?

If you use one now, do you love it or hate it?

What features would you like to see?

Pricing I was thinking of doing it as a pay per usage like AWS/Digital ocean.

Free plan with up to 10 monitors.

After that every other monitor would be maybe $0.20/per month. Would only charge your account after it hit $10.00 in usage.

It can monitor:
SSL
Uptime
Cronjobs
Page changes - specific to the page that is monitored. Doesn't monitor the entire site.