Open-source alternatives to UptimeRobot

The open-source or self-hostable project you can use instead of UptimeRobot, with license, free-edition limits and setup checked against official sources.

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Uptime KumaAlternative to UptimeRobot, Statuspage
A self-hosted monitoring tool that checks websites and services and sends alerts and status pages.
MITSelf-hosted
92k
GitHub stars
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Uptime Kuma — Uptime Kuma can replace a hosted uptime monitor by running HTTP, TCP, ping and DNS checks with alerts from your own server.