LiveWatch & NewRelic

19. LiveWatch

LiveWatch Free Uptime Monitoring Service (image credit – livewatch.de)

This free uptime monitoring service gives you downtime alerts via email, SMS, telephone, messenger and Twitter. It gives you a graphical analysis of the report and a PDF protocol that is created for 30 days after each failure in the report. Thepremium plan offers additional features.

20. NewRelic

NewRelic Free Uptime Monitoring Service (image credit – newrelic.com)

NewRelic is a uptime monitoring service with a forever free plan with limited features. They include application response time monitoring, monitoring of most time consuming transactions, performance of external services, database monitoring, infrastructure monitoring, availability and error monitoring, security checks and App speed index reports.

Check out the feature comparison chart of free and paid plans.