Yes, both Sken.io and PageCheck offer a Free Trial.
Sken.io is designed for Large Enterprises, Medium Business and Small Business.
PageCheck is designed for Medium Business and Small Business.
The starting price of PageCheck begins at $19/Month, while pricing details for Sken.io are unavailable.
Some top alternatives to Sken.io includes ChangeTower, OnWebChange, Super Monitoring, PageCheck, Pagescreen, DevMonitor.io, Nodeify, Uptrends, Visualping and PageWatch.
Some top alternatives to PageCheck includes Uptime, Super Monitoring, GTmetrix, Uptrends, 66uptime, WebForce Uptime, Pingt.io, 4Uptime and Performance90.