Downtime Monkey

Website monitoring & downtime alerts. Uptime, downtime & response times. 60 websites monitored every minute, completely free.

Powerful features including: Email Alerts, SMS Alerts Worldwide, Percentage Uptime to 3 decimal places (e.g. 99.999%), Response Times, Custom Alerts (i.e. get notified if a website remains down for x minutes), Repeat Alerts, Rate Limiting of SMS Alerts, Bulk Import and Edit Monitors, Stats for 2 Years, Logs of Specific Downtimes (including reasons for downtimes).