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Please don't use multiple accounts to promote your business on HN.

It's not my business, I also can recommend the Uptime Kuma (selfhosted)...

What about your earlier Show HN post for the same service where you quote:

> I've created the best free website downtime checker. Don't trust me? Try it yourself.

Is the custom domain for status pages available on the free plan?

Yes.

How about the commercial use of the free plan?

At this point, yes. I don't know what will happen in future.