I want to share with you a multifunctional tool https://www.host-tracker.com/ that will be useful to many webmasters. You have the opportunity to test many options for free for 30 days.
I managed to take advantage of the advantageous offer and received a month of free testing.
After 30 days of the free test, you can choose one of the subscriptions for a month or a year.
You can manually check the following indicators on the host tracker for free:
- 100 URL Check every 1 minute;
- Monitor Response Time;
- 10 contacts, Unlimited alerts, 25 free SMS/month;
- DNS Blacklist Check;
- Domain and Certificate, Expiration Monitoring;
- CPU, RAM, HDD Load Monitor;
- Full log, Error snapshotting.

I managed to take advantage of the advantageous offer and received a month of free testing.

After 30 days of the free test, you can choose one of the subscriptions for a month or a year.
You can manually check the following indicators on the host tracker for free:
- PageSpeed - website performance test from selected location of the globe using browsers.
- General Http check of your website. Each test simulates downloading of the page by a real customer.
- Check through ICMP (ping). If Ok, the site or the hardware is available online.
- Advanced check through ICMP. Does the same thing as "traceroute" program in Linux and macOS, or the "tracert" program in Windows.
- Check of the specific port via TCP. This kind of check is useful to monitor network applications. If Ok, the port is open.
- Check if a site, domain or IP is not listed in most popular DNS blacklists.
- Check if a site has some known vulnerabilities.
