What website monitoring tool do you use?

Uptime Robot is great! Adding Echobell for alerting - turns Webhooks into iOS push + phone calls. Good complement to your monitoring stack.

Other: built https://sitemaptools.io/ to spy on other website's sitemap.xml files - and to also check my own ones ;)

Well, not mentnioned but to monitor your website security => pingkat.
(Yes, I am the founder)

I've used many over the last 15 years, and can honestly say that I recommend BetterUptime - now called BetterStack - to all who ask me about monitoring. And no, I'm not affiliated, just LOVE the product. In addition to great uptime monitoring, they also have heartbeats (for alerts when things DON'T happen, like cron or scheduled tasks) and status pages.

https://betterstack.com/uptime

For real apps, I use sentry. It's feature-complete and reliable.

For landing pages, I just use hotjar. You get way more recordings and hotmaps for cheaper.

I use a mixture of equipment for internet site monitoring, inclusive of Pingdom, UptimeRobot, and Google Analytics. Each device offers precious insights into internet site performance, uptime, and person behavior, assisting me make certain the easy functioning of the website and most excellent consumer experience.

I've been using for quite some time now and can recommend Uptime Robot.

I use Digital Ocean as a hister which has built in alerts. It is very basic but just throwing it out there

I'm curious to see if their ranking aligns with IH community opinion.

Uptime Robot's ranking, where Uptime Robot is at the 1st place? ;)

P.S. Apart the 4 options from your poll, here are another ~200 to choose from: https://www.supermonitoring.com/blog/the-updated-list-of-website-monitoring-services/

In the article, I agree with them on the benefits you get when you choose the right monitoring (Early issue detection, Minimized downtime,...)
With the criteria of Early issue detection, UptimeRobot only gives you a 5-minute interval, which means sometimes you find the issue after 5 minutes of downtime. That's one of the reason why we build Bubobot. While Uptime Robot works for basic website checks, we built Bubobot specifically for technical teams who need faster alerts (our checks run as frequently as every 10 seconds) and monitoring beyond just websites - think Kafka, MQTT, and complex internal services. Try to use here https://bubobot.com/

I use performance90 for everything (I work in marketing) - it's free, simple, and secure, and I know the founder.

I have started using google Analytics for my app’s landing page. Quite a lot in it which I need to explore more

Apart from Google Search Console?

I've been using Ubersuggest vir SEO data. It's been pretty useful so far!