Show IH: Free, no-auth site monitoring, too simple?

I built a simple website monitoring tool over the weekend: on404.com

It checks your sites every 10 minutes and lets you monitor up to 10 sites for free. You’ll get an email alert if your site goes down.

I mainly built this because most tools felt either overkill or paid too early for small projects. I wanted something dead simple to just know: “is my site up?”

No login complexity, no heavy dashboards — just basic monitoring.

Would love honest feedback:

• Is this useful to you?
• Is this simple enough, or too minimal?”
• What’s missing for your use case?
• Would you actually rely on something like this?