Nagios vs Zabbix: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Nagios and Zabbix side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Best for you if:
- • You want legacy monitoring standard
Zabbix
The universal, open-source observability solution for IT & OT infrastructure.
Best for you if:
- • You want 100% open-source with no license fees, leading to exceptionally low TCO
| At a Glance | Nagios | Zabbix |
|---|---|---|
Starts at | Free plan | Free plan, paid from $50/mo, billed monthly Cloud Nano plan |
Category | Monitoring Cloud & Infrastructure | Monitoring Cloud & Infrastructure |
Rating | 4.5/5 G2 4.5 58 reviews | 4.5/5 G2 4.3 · Capterra 4.7 320 reviews |
Free plan | Yes | Yes |
Watch out for | n/a | Cloud prices are starting points. Config and storage add. Annual is 10% off the monthly Cloud bill. |
Choose Nagios or Zabbix?
Choose Nagios if
- You want legacy monitoring standard
- You want highly customizable
Choose Zabbix if
- You want 100% open-source with no license fees, leading to exceptionally low TCO
- You want highly adaptable and scalable, suitable for diverse and large enterprise environments
In-Depth Analysis
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Nagios' pricing model, with a robust free tier and one-time purchase options for commercial versions, is quite generous compared to many subscription-based monitoring tools.
Strengths
- Pro: Legacy monitoring standard
- Pro: Highly customizable
- Pro: Large plugin library
- Pro: Free and open source
- Pro: Battle-tested
Weaknesses
- Con: UI very dated
- Con: Configuration complex
- Con: Scaling difficult
- Con: Setup time-consuming
- Con: Alternatives more modern
Key features
Zabbix
The universal, open-source observability solution for IT & OT infrastructure.
Zabbix the software is a download.
Watch out
Cloud prices are starting points. Config and storage add. Annual is 10% off the monthly Cloud bill.
Strengths
- Pro: 100% open-source with no license fees, leading to exceptionally low TCO
- Pro: Highly adaptable and scalable, suitable for diverse and large enterprise environments
- Pro: Comprehensive monitoring capabilities for a wide range of IT and OT infrastructure
- Pro: Flexible deployment options: on-premise, managed cloud, or third-party cloud
- Pro: Strong security features and compliance focus, trusted by global enterprises
Weaknesses
- Con: Requires technical expertise for on-premise deployment and advanced configuration
- Con: Initial setup and customization might be complex for new users without prior experience
Key features
Plans and prices: Nagios vs Zabbix
| Tool | Plans and prices | Source |
|---|---|---|
| Nagios |
| nagios.org read Sep 30, 2026 |
| Zabbix |
| zabbix.com/cloud read Nov 1, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Nagios pricing and Zabbix pricing.
Key Takeaways
Nagios
- Choose if you want the industry standard in open-source IT monitoring tools for servers, networks, applications, and services
Zabbix
- Choose if you want the universal, open-source observability solution for IT & OT infrastructure
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- User ratings are within 0.2 points (4.5/5 from 58 reviews for Nagios, 4.5/5 from 320 reviews for Zabbix).
- Zabbix starts at $50/mo, billed monthly; Nagios has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Nagios and Zabbix compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. User ratings are within 0.2 points (4.5/5 from 58 reviews for Nagios, 4.5/5 from 320 reviews for Zabbix). Zabbix starts at $50/mo, billed monthly; Nagios has no public paid plan price on file. Both have a free plan.
What are Nagios and Zabbix used for?
Nagios: The industry standard in open-source IT monitoring tools for servers, networks, applications, and services. Zabbix: The universal, open-source observability solution for IT & OT infrastructure.
What does Nagios cost vs Zabbix?
Nagios has no public paid-plan price on file. Zabbix's cheapest paid plan is Cloud Nano at $50/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Nov 1, 2026.
What's the main difference between Nagios and Zabbix?
Nagios's main strength: legacy monitoring standard. Zabbix's main strength: 100% open-source with no license fees, leading to exceptionally low TCO.