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Site Monitor vs ManageWP and MainWP
If you run a WordPress agency you probably already use ManageWP or MainWP for updates and backups, and both offer uptime monitoring as an add-on. The question is whether that add-on is enough once you charge clients for it, and what it costs once you white-label it.
This page covers both. ManageWP is a hosted service billed per site; MainWP is a plugin you host on your own WordPress install. Site Monitor is a standalone monitor that works for any URL, WordPress or not.
Side by side
Compared at 100 client sites, which is where the per-site add-ons start to add up.
| ManageWP | MainWP Pro | Site Monitor Agency Plus | |
|---|---|---|---|
| Monitoring for 100 sites | Uptime add-on $1/site/mo — about $100/mo | $29/mo flat, self-hosted | $99/mo ($0.99/site) |
| White-label | Extra $1/site/mo; the bundle lands around $150/mo for 100 sites | Included — it runs on your own domain | Included — alerts, reports and status pages |
| Alert emails from your own domain | With the white-label add-on | Yes, your server sends them | Yes — custom SMTP, included |
| Non-WordPress sites | WordPress only (requires the Worker plugin) | WordPress only (requires the Child plugin) | Any URL |
| Hosting | Hosted by ManageWP | You host, update and secure the dashboard | Hosted |
| Uptime reports to clients | Part of the maintenance client report | Through reporting extensions | Uptime-focused, weekly or monthly, your logo |
| Public status pages | No | No | Included on Agency plans |
| Alert channels | See ManageWP's current feature list | See MainWP's current extensions | Email, Slack, webhook; SMS on Agency Plus |
| Updates, backups, security scans | Yes — that is the core product | Yes — that is the core product | Monitoring only |
| Team users | Collaborators included | WordPress users on your install | Unlimited on Agency plans |
Where ManageWP and MainWP win
They do far more than monitoring. Plugin updates, backups, security scans, performance checks and a client report that rolls all of it up — that is the reason you pay for them, and monitoring is a convenient add-on. If your care plan is mostly maintenance and every site you manage is WordPress, the built-in uptime check may be all you need, especially on MainWP where it costs nothing extra.
MainWP also keeps everything on your own server. For agencies with strict data-residency promises, that matters more than any feature on this page.
Where Site Monitor wins
Monitoring is the whole job here, so it goes deeper: outage duration in every recovery alert, a calendar view of uptime per site, scheduled reports that a client can read without knowing what a plugin is, and status pages you can hand to a client. Alerts route to Slack, any webhook, or a phone, not just an inbox.
It also covers the sites the WordPress managers can't: the client's Squarespace landing page, the booking system on a subdomain, the custom app your developer built. One list, one report, one price.
On cost, Site Monitor at $49/mo for 25 sites ($1.96/site) or $99/mo for 100 sites ($0.99/site) sits below ManageWP's white-labeled bundle at 100 sites, and above MainWP's flat $29/mo — the difference buying you hosting, support and the reporting layer.
Verdict
Stay with ManageWP or MainWP if everything you manage is WordPress, your care plan is built around updates and backups, and "site is up" is enough detail for your clients.
Add Site Monitor if monitoring is a line item clients pay for, you manage sites outside WordPress, or you want uptime reports and alerts that carry your brand without a per-site add-on. Many agencies run both: MainWP for maintenance, Site Monitor for the alerts and the monthly report.
Also compared: UptimeRobot · Freshping alternative