What are some alternatives?
When comparing Librato and PagerDuty, you can also consider the following products
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
OpsGenie - Alerting and On-Call Management for Dev&Ops Teams
Site24x7 - Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.
Pulseway - Pulseway changes the enterprise monitoring and management game with its mobile management solution.
VictorOps - We make on-call suck less & help teams to solve problems faster.
Zabbix - Track, record, alert and visualize performance and availability of IT resources