Nagios XI Review (2026)
- Starting price
- $2595/one-time (100 nodes, Standard)
- Free trial
- Free tier + 30 days
- Deployment
- On-prem
- Best for
- Teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core
Our verdict
Nagios XI earns 8.0/10 in our review, weighted from 4.5/5 (~55 G2 reviews) and its feature/pricing profile. The classic open-source monitoring workhorse — unbeatable on price and control, if you can handle the configuration. Best for teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. Starting price: $2595/one-time (100 nodes, Standard).
Backed by 4.5★ · 55 reviews on G2.
Pros & cons
✓ Pros
- Free
- capable open-source core
- Perpetual (no recurring) license
- On-prem data control + extensibility
✕ Cons
- Dated interface vs SaaS rivals
- Heavier manual configuration
- Support requires paid maintenance
Key features
- SNMP + network device monitoring
- Perpetual on-prem licensing
- Event-driven remediation
- Free open-source core (Nagios Core)
- Capacity planning + SLA reports (Enterprise)
- Large plugin/community ecosystem
How Nagios XI compares
| Nagios XI | Auvik | PRTG Network Monitor | |
|---|---|---|---|
| Starting price | $2595/one-time (100 nodes, Standard) | Custom quote | Free tier available |
| Pricing model | per device | quote | per sensor |
| Free trial / tier | Free tier + 30 days | 14 days | Free tier + 30 days |
| Best for | Teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core | MSPs wanting automated network mapping + monitoring | Teams wanting sensor-based monitoring with a free tier |
| Deployment | On-prem | Cloud | On-prem + cloud |
| G2 rating | 4.5/5 (55) | 4.5/5 (200) | 4.6/5 (250) |
| Capterra rating | — | — | — |
| Our score | 8.0 | 7.8 | 8.0 |
Full review
Nagios XI review — 8.0/10
The classic open-source monitoring workhorse — unbeatable on price and control, if you can handle the configuration. Our score weights 4.5/5 (~55 G2 reviews) against feature breadth and pricing value.
Pricing value
Nagios XI starts at $2595/one-time (100 nodes, Standard) on a per device model with a free tier. See the full pricing breakdown.
Who should buy Nagios XI
Best for teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. If that is not you, weigh the alternatives.
Frequently asked questions
- Is Nagios XI worth it?
- Nagios XI earns 8.0/10 in our review, weighted from 4.5/5 (~55 G2 reviews) and its feature/pricing profile. The classic open-source monitoring workhorse — unbeatable on price and control, if you can handle the configuration. Best for teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. Starting price: $2595/one-time (100 nodes, Standard).
- What does Nagios XI cost?
- From $2595/one-time (100 nodes, Standard) — see the pricing page.
Based on aggregated third-party ratings (4.5/5 (~55 G2 reviews)) and Nagios XI's published feature and pricing data. Hands-on testing notes are added as we trial each tool — see how we test.