This guide is for IT teams with Nagios checks and plugins who want less operational work for public website monitoring without losing infrastructure visibility. It is not a claim that Nagios is broadly inferior. The useful question is whether its strongest capabilities match the work your team actually needs.
As of August 10, 2026, Nagios XI is node-licensed, self-managed infrastructure monitoring. The official 2026 pricing shows a free small-environment edition, Standard at $2,595 for 100 nodes, and Enterprise at $4,690 for 100 nodes; maintenance renewals keep updates, support, and premium features. Prices and packaging can change, so use the linked official sources for a final quote.
Short answer
Nagios remains appropriate for customizable infrastructure monitoring. A hosted alternative is a complement or partial replacement for public endpoints, not a drop-in replacement for the plugin estate.
Where Nagios is still the better fit
- Mature plugin ecosystem for servers, networks, applications, and unusual protocols
- Perpetual XI licensing rather than a recurring per-host SaaS bill for the base license
- Fine control over service checks, dependencies, handlers, and custom scripts
Why teams consider an alternative
- You operate the deployment, upgrades, plugins, notification tuning, and high availability
- A node can contain many service checks, so headline node pricing is not directly comparable with per-monitor SaaS pricing
- Hosted uptime monitoring cannot replace Nagios host metrics, plugin logic, or internal network coverage
Comparison criteria that matter for Nagios users
- Plugin and internal-network requirements.
- Staff time for operation and upgrades.
- Outside-in independence from the monitored environment.
- Customer status communication and modern alert routing.
Where Webalert fits—and where it does not
Against Nagios, Webalert’s relevant scope is managed HTTP/HTTPS, TCP, DNS, ping, and heartbeat monitoring with multi-region confirmation, SSL alerts, status pages, and incident alerting. Check current pricing and features for plan boundaries.
Webalert is a possible fit when the migration scope is straightforward public availability and customer communication. It is not a promise of parity with every Nagios capability. In particular, respect the limitations above and keep specialist tooling where it remains useful.
Migration advice
Classify checks as internal infrastructure, custom plugin, or public endpoint. Keep the first two in Nagios. Recreate public endpoint checks in the hosted service, map contacts and maintenance windows, and verify both failure and recovery. Only retire duplicate Nagios checks after two weeks of matching results.
Decision
Nagios remains appropriate for customizable infrastructure monitoring. A hosted alternative is a complement or partial replacement for public endpoints, not a drop-in replacement for the plugin estate. Avoid an all-at-once cutover: move the checks that clearly fit, preserve specialist coverage, and let parallel evidence decide the rest.
Plugin estate vs a URL you do not host
Nagios (and Nagios-shaped forks) excel at host/service plugins you already wrote. They fail as the only public uptime signal when the Nagios box shares a network with production.
| Work | Keep Nagios | Add hosted uptime |
|---|---|---|
| Custom NRPE / plugin checks | Yes | No plugin runtime |
| Core + XL licensing conversations | The product | Irrelevant |
| Homepage / API from the internet | Possible, extra config | Default |
| On-call that is not sendmail | You bolted it on | Slack/SMS destinations |
| Status for customers | Not the point | Status pages |
Frequently asked questions
Is Zabbix the same decision?
Same class (you operate the poller), different UI and templates. See the Zabbix alternative.
Do I have to decommission Nagios to add Webalert?
No. Point hosted checks at the public hostname; leave disk/RAID/NTP plugins where they are.