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This is only for Whatsapp and sms, email you get unlimited notifications. I personally use my own monitoring, but you can also self host Healthchecks as well or use Uptime Kuma.

interesting

PS. I assumed that to receive emails you needed a paid plan. Looks like it's not the case.

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No, what I suggested all works on the free plan, you can run 20 of them. If you need more, you can self host it, or buy a paid plan. But personally, I'd recommend Uptime Kuma as it does this and a whole lot more, just healthchecks was the easiest to use for this situation and wanted this to be easy.