Detak

Detak checks your websites, pages and ports about every 15 minutes from your Android phone and alerts you when one goes down. No account, no server of ours: your monitors stay on the phone.

1. Websites and ports HTTP status, a keyword on a page, or an open TCP port.
2. Alerts A notification when something goes down and when it is back.
3. Honest limits About every 15 minutes; battery saving may delay it; none if off.