Yes, both Candum and Uptime offer a Free Trial.
Candum is designed for Medium Business and Small Business.
Uptime is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Candum Starts at $9.99/Month whereas for Uptime Starts at $15/Month when Billed Yearly.
Some top alternatives to Candum includes Uptime, CHEQ.ONLINE, Super Monitoring, DevMonitor.io, UpTime.onl, Monitis, Uptrends, 66uptime, WebForce Uptime and Pingt.io.
Some top alternatives to Uptime includes Uptime Robot, Super Monitoring, Dotcom Monitor, DevMonitor.io, UpTime.onl, Odown, Downtime Monkey, SiteUptime, updown.io and SolarWinds Pingdom.