Yes, both Spike.sh and PagerDuty offer a Free Trial.
Spike.sh is designed for Medium Business and Small Business.
PagerDuty is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Spike.sh Starts at $6.4/user/month when yearly whereas for PagerDuty Starts at $10.
Some top alternatives to Spike.sh includes Freshservice, PagerDuty, YetiCloud, Amixr, TaskSift, AlertOps, Mission Manager, FireHydrant, Incident.io, StatusCast Incident Management and ResQ.
Some top alternatives to PagerDuty includes Freshservice, xMatters, Opsgenie, VictorOps, YetiCloud, AlertOps, Splunk On-Call, Splunk Enterprise, ServiceNow Customer Service Management, Zenduty and StatusCast Incident Management.