Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Checky - How many times a day do you check your phone?
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Chillkeeper - Stop running. Start chilling.
Better Uptime - We call you when your website goes down
UnPlug - Track your iPhone usage & digital detox with Gamification