OnlineOrNot is an independent website monitoring service, providing uptime checks, browser checks, and page speed monitoring. OnlineOrNot is developed here in Sydney before and after business hours by a developer that also works at Atlassian.
The uptime checks run every minute, from all over the world, and you get notified over Email, Slack, SMS or Webhooks if anything goes wrong.
The browser checks automate using a real browser to visit any URL, and checking if certain text is on the page.
The page speed monitoring runs twice per day, checking how fast your webpage runs.
There’s no time limit on the free tier, and no credit card required.