An UptimeRobot alternative you're allowed to bill clients with. UptimeRobot's free plan is for non-commercial use — monitoring client sites on it is against the terms. So the real choice is: pay monthly per monitor, forever, or own the tool once. Here is that comparison, honestly.

The free tier explicitly excludes commercial use — and monitoring a client's website is commercial use. If you're an agency or freelancer billing for site care, staying on the free plan means your monitoring runs on borrowed terms that can be enforced any day.

The paid plans are honest SaaS: a monthly bill that scales with monitors and features, roughly $9–$69+/month by tier. Global probe locations, zero maintenance — genuinely good. Over three years of agency use you'll pay for the convenience many times over, and the uptime history lives in their cloud, not yours.

One payment, one company, no meters: unlimited monitors, unlimited client status pages, unlimited seats — plus the things UptimeRobot doesn't bundle at any tier: four-role RBAC, isolated tenants per client, incident timelines with postmortems, and full source code with private modification rights. Alerts by email, Slack, Discord and signed webhooks.

You monitor a handful of personal projects, or you want checks from many global locations and don't want to run a server. The paid tier is fair for that. Owning software you don't want to host isn't a bargain, it's a chore.

You bill clients for site care. Then monitoring is a product you resell, not a cost to minimize: every client gets a branded status page on your domain, your team gets roles, and the per-monitor meter disappears. Twenty clients at $29/month for monitoring pays for Vigil in week one — the agency math, spelled out.

Don't take a comparison page's word — ours or anyone's. Click through the demo (real screens of the running app, no signup) or watch the 60-second film: monitors fail, an incident opens itself, the status page updates, recovery closes it.