Nagios XI review

Nagios XI is for admins who want to own their monitoring outright. It runs on your own Linux server, executes plugins against hosts and services on a schedule, compares each result with warning and critical ranges you set, and notifies the right contacts, with escalation and scripts that can fix a fault automatically. Network gear is usually monitored agentless over SNMP, while servers can use the NCPA agent on Linux, Windows, macOS and AIX. More than 90 configuration wizards and auto-discovery speed up setup, and every licensed node gets unlimited services. Reporting covers SLAs, capacity planning and scheduled reports. Licensing is perpetual and per node: Standard costs $2,595 for 100 nodes and Enterprise, which adds bulk tools and an audit log, is $4,690. That upfront bill is large next to monthly plans, and the interface and setup feel more manual than tools like Auvik or PRTG, which is why it ranks last here.

Who it is for

Admins who prefer a one-time license and plugin-based checks they fully control on their own Linux server.

Price

Perpetual Standard license from $2,595 for 100 nodes.

From, 100 Nodes $2,595
Quoted from the vendor pricing page on November 9, 2026.

Key features

• 90+ configuration wizards and auto-discovery
• Agent-based and agentless monitoring, including SNMP for network devices
• Unlimited services on every licensed node
• Escalating notifications and event handlers that can run fix scripts
• SLA reports, capacity planning and scheduled reports

Strengths and weaknesses

• Strength: Perpetual license instead of a recurring subscription
• Strength: Unlimited checks per licensed node
• Strength: Large plugin ecosystem through Nagios Exchange
• Weakness: Large upfront cost compared with monthly plans
• Weakness: Bulk tools and audit logs need the Enterprise license, from $4,690
• Weakness: Older-style interface and more manual setup than cloud tools

Key facts

• Pricing model: Perpetual, per node
• Standard: $2,595 for 100 nodes
• Enterprise: $4,690 for 100 nodes
• Free trial: 30 days

Where it ranks

Nagios XI is No. 10 in our Best Network Monitoring Tools verdict.