Best Network Monitoring Software · 2026
Nagios XI vs 
Zabbix Nagios XI vs Zabbix: on our data-weighted scoring, Zabbix edges ahead (8.1 vs 8.0/10). 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; Zabbix starts at Free tier available and is best for budget-conscious teams wanting a fully free, open-source, highly scalable monitoring platform. Choose Zabbix 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 | Nagios XI | Zabbix |
|---|---|---|
| Editorial | 8.0 | 8.1 |
| User reviews | 9.0 | 8.6 |
| Adoption | 4.6 | 6.0 |
| Affordability | 9.5 | 9.5 |
| Feature breadth | 6.0 | 6.0 |
| Ease of trial | 10.0 | 10.0 |
| Nagios XI | Zabbix | |
|---|---|---|
| Starting price | $2595/one-time (100 nodes, Standard) | Free tier available |
| Pricing model | per device | flat |
| Free trial / tier | Free tier + 30 days | Free tier + free trial |
| Best for | Teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core | Budget-conscious teams wanting a fully free, open-source, highly scalable monitoring platform |
| Deployment | On-prem | Cloud + self-host |
| G2 rating | 4.5/5 (55) | 4.3/5 (192) |
| Capterra rating | — | — |
| Our score | 8.0 | 8.1 |
You need teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core.
You need budget-conscious teams wanting a fully free, open-source, highly scalable monitoring platform.
Zabbix bills on a flat model from Free tier available (free tier available), 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.
Zabbix ships 6 headline capabilities (Free + open-source (no license fees), Agent + agentless collection, 250+ official templates, Distributed + high-availability monitoring) and deploys Cloud + self-host. Nagios XI ships 6 (SNMP + network device monitoring, Perpetual on-prem licensing, Event-driven remediation, Free open-source core (Nagios Core)), deploying On-prem.
Zabbix holds 4.3/5 (~192 G2 reviews); Nagios XI holds 4.5/5 (~55 G2 reviews). On our data-weighted score, Zabbix edges ahead (8.1 vs 8.0/10). Pick Nagios XI instead when teams wanting on-prem, perpetually-licensed infrastructure monitoring with a free open-source core. See Zabbix alternatives or Nagios XI alternatives.