Yes, both PagerTree and Spike.sh offer a Free Trial.
PagerTree is designed for Large Enterprises, Medium Business and Small Business.
Spike.sh is designed for Medium Business and Small Business.
Pricing for PagerTree Starts at $0/user/month when monthly whereas for Spike.sh Starts at $6.4/user/month when yearly.
Some top alternatives to PagerTree includes Freshservice, PagerDuty, Opsgenie, VictorOps, AlertOps, Spike.sh, Mission Manager, Zenduty, StatusCast Incident Management, Kintaba and Pager Team.
Some top alternatives to Spike.sh includes Freshservice, PagerDuty, YetiCloud, Amixr, TaskSift, AlertOps, Mission Manager, FireHydrant, Incident.io, StatusCast Incident Management and ResQ.