what is the best uptime monitoring site you know, has anyone used it before?

[boygame]

I did research for uptime tracking. I haven't decided yet. Has anyone used it before? Is there a service provider you know and trust?

Update: It’s been a while since I first asked the question, and in that time, I’ve tested around 10 different website monitoring tools. I tried all of their free plans, and I can say I explored them thoroughly.
You can actually find a list of nearly 30 free website monitoring tools here sorted by how many monitors and features they offer. I used that list as a reference while testing.
In the end, I found RobotAlp to be a solid choice. It gives you 20 free monitor slots and checks your site every 3 minutes. Plus, it offers 13 different monitoring tools, some of which I actively use.
Thanks to everyone who helped along the way!

 

[hipcat]

Most of them have a limit on a free plan, but it's ok if you just have 1 or 2 main websites to monitor.

 

[greenhostcloud]

I did research for uptime tracking. I haven't decided yet. Has anyone used it before? Is there a service provider you know and trust?

I recommend using UptimeRobot for monitoring website uptime. It is simple to set up and offers a variety of monitoring options. Many users have had positive experiences with UptimeRobot for tracking their website performance.