I've recently been making improvements to Larm, https://larm.dev, an uptime monitoring service I've been running for a while now. It's got global probe coverage, automatic/standalone status pages, and lots of alert channels. Pricing is simple and the limits are generous.

It's accumulated a decent number of users now which is exciting.

Under the hood it's an Elixir backend with a network of little go probes running all over the world, all connected by TCP tunnels. All the check result data is stored in Clickhouse. Status pages are generated on demand and served through a CDN.

The whole thing is EU hosted.