More checks can mean more cost
Adding sensors, metrics, and service checks can increase licensing needs even when the number of devices stays the same.
PRTG alternative
Outgrowing PRTG? Compare How Nagios XI Scales
If sensor growth is making monitoring more expensive—or forcing you to think about licensing every time you add a check—Nagios XI offers a more predictable node-based model with unlimited checks per licensed node.
Why PRTG customers start looking for another option
As environments grow, PRTG customers can find that adding monitoring depth also adds licensing pressure.
Budgeting gets harder
Monitoring requirements change over time, so variable licensing can make future costs harder to predict.
Templates stop being enough
Custom applications, APIs, legacy systems, and specialized devices often need monitoring that can be extended beyond built-in templates.
You want more control
Some teams want to decide where monitoring runs, how it integrates, and how infrastructure across data centers and cloud environments is covered.
Predictable pricing
License the node. Monitor the services that matter.
Nagios XI uses node-based licensing with unlimited checks per licensed node. A 100-node license covers up to 100 monitored nodes, while the number of service checks on those licensed nodes does not create additional XI license consumption.
That gives infrastructure teams a more predictable way to expand monitoring depth as requirements change, subject to practical system capacity.
- Predictable node-based licensing
- Unlimited checks per licensed node
- Add monitoring depth without licensing each additional service check
- Deploy XI on-premises or in the cloud and extend it with plugins, scripts, APIs, and integrations
Why XI enters the PRTG conversation
The difference is how monitoring depth affects licensing, budgeting, and flexibility.
Node-based
License the monitored node rather than each additional service check
Unlimited checks
Monitor the services that matter on each licensed node, within practical system limits
Custom monitoring
Use plugins, scripts, APIs, and agentless methods when built-in templates are not enough
Different licensing structure
Own the license. Keep support and updates current.
Nagios XI is sold as a perpetual software license, with the first year of Maintenance & Support included. Customers typically renew Maintenance & Support annually to continue receiving product updates, bug fixes, security updates, and support.
MCS can also review what PRTG monitors today, map those requirements into Nagios XI, and validate the replacement before the old environment is retired.
Considering a PRTG replacement?
See whether XI gives you a more predictable monitoring cost model
Tell us how many devices you monitor today, how deeply you monitor them, and what is driving the PRTG review. We can compare the licensing model and determine whether Nagios XI is a practical fit.
- Current PRTG sensor/check usage
- Node-based XI licensing comparison
- Custom monitoring requirements
- Migration planning and validation
Review my PRTG environment
Share what is driving the change. We can help compare the licensing and technical fit.