Define endpoint health checks and alerts in configuration files.
Free Apache-2.0 software · No per-monitor licence quota · Always-on hosting and storage extra

Developer tools
Check your websites for downtime, receive email alerts, and publish status pages on your own domains.
Check your websites for downtime, receive email alerts, and publish status pages on your own domains.
For one person, check up to ten owned websites every five minutes, receive outage emails and publish up to three public status pages on custom domains. UptimeRobot free has more monitors (50) but basic status pages and is described for hobby/nonprofit projects. Its Solo paid plan lists three status pages on own domains; Pulsetic supplies that narrow custom-domain workflow free with slower five-minute checks. No recommendation to migrate for basic monitoring alone.
Free capacity is per person or organization across accounts; creating accounts to multiply capacity is prohibited. No free SMS/phone alert credits, AI monitor runs, API/MCP/N8N, password-protected pages or additional teammates. Monitor resources you own or control; restrictive firewalls may require IP allowlisting. No third-party firewall-bypass guarantee. Five-minute polling is slower than paid UptimeRobot Solo 60-second monitoring. UptimeRobot free has more monitors (50) but basic status pages and is described for hobby/nonprofit projects. Its Solo paid plan lists three status pages on own domains; Pulsetic supplies that narrow custom-domain workflow free with slower five-minute checks. No recommendation to migrate for basic monitoring alone.
Each comparison covers the workflow described above, rather than every paid feature.