Best Network Monitoring Software · 2026
ManageEngine OpManager vs 
Nagios XI ManageEngine OpManager vs Nagios XI: on our data-weighted scoring, ManageEngine OpManager edges ahead (8.3 vs 8.0/10). ManageEngine OpManager starts at $95/yr (10 devices, Standard) and is best for smbs and mid-market wanting affordable, device-based network + server monitoring; Nagios XI starts at $2595/one-time (100 nodes, Standard) and is best for teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. Choose ManageEngine OpManager for the stronger overall track record; consider Nagios XI if its pricing model or fit matches your environment better. Side-by-side table below.
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Six criteria, each scored 0–10 on the same scale from real review data, public pricing and feature coverage. See our methodology →
| Criterion | ManageEngine OpManager | Nagios XI |
|---|---|---|
| Editorial | 8.3 | 8.0 |
| User reviews | 9.2 | 9.0 |
| Adoption | 5.6 | 4.6 |
| Affordability | 1.4 | 9.5 |
| Feature breadth | 8.0 | 6.0 |
| Ease of trial | 6.0 | 10.0 |
| ManageEngine OpManager | Nagios XI | |
|---|---|---|
| Starting price | $95/yr (10 devices, Standard) | $2595/one-time (100 nodes, Standard) |
| Pricing model | per device | per device |
| Free trial / tier | 30 days | Free tier + 30 days |
| Best for | SMBs and mid-market wanting affordable, device-based network + server monitoring | Teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core |
| Deployment | Cloud + on-prem | On-prem |
| G2 rating | 4.6/5 (127) | 4.5/5 (55) |
| Capterra rating | — | — |
| Our score | 8.3 | 8.0 |
You need smbs and mid-market wanting affordable, device-based network + server monitoring.
You need teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core.
ManageEngine OpManager bills on a per device model from $95/yr (10 devices, Standard) (30 days trial), while Nagios XI uses a per device model from $2595/one-time (100 nodes, Standard) (free tier available). Because the models differ, the cheaper option flips depending on your fleet size — model both at your seat/endpoint count.
ManageEngine OpManager ships 8 headline capabilities (Device-based licensing (all interfaces incl.), Network + server + VM monitoring, Fault + performance management, Customizable dashboards + maps) and deploys Cloud + on-prem. Nagios XI ships 6 (SNMP + network device monitoring, Perpetual on-prem licensing, Event-driven remediation, Free open-source core (Nagios Core)), deploying On-prem.
ManageEngine OpManager holds 4.6/5 (~127 G2 reviews); Nagios XI holds 4.5/5 (~55 G2 reviews). On our data-weighted score, ManageEngine OpManager edges ahead (8.3 vs 8.0/10). Pick Nagios XI instead when teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. See ManageEngine OpManager alternatives or Nagios XI alternatives.