Yes, both PingStack and WatchSumo offer a Free Trial.
PingStack is designed for Medium Business and Small Business.
WatchSumo is designed for Medium Business and Small Business.
Pricing for PingStack Starts at $9/Month whereas for WatchSumo Starts at $7/Month.
Some top alternatives to PingStack includes Uptime, Uptime Robot, Hyperping, DevMonitor.io, UpTime.onl, CallView 360, SiteUptime, pingnow.io, WatchSumo and Loadping.
Some top alternatives to WatchSumo includes Uptime, Super Monitoring, UpTime.onl, Netumo, Uptrends, pingnow.io, WebForce Uptime, Pingt.io and Statsignal.