Robusta vs Nagios: Which Should You Choose in 2026?
Choosing between Robusta and Nagios comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
By Toolradar Team · Last updated February 28, 2026 · Methodology
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Robusta
Automated cloud troubleshooting and Kubernetes observability with Agentic AI.
Best for you if:
- • Automates Kubernetes troubleshooting with Agentic AI.
- • Integrates with existing observability tools without instrumentation.
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Best for you if:
- • You want the higher-rated option (8.5/10 vs 0.0/10)
- • Open-source IT monitoring for servers, networks, applications, and services.
- • Offers both a free, community-supported core and an enterprise-grade paid version (Nagios XI).
| At a Glance |  Robusta |  Nagios |
|---|---|---|
Price | Free + Paid | Free + Paid |
Best For | Monitoring | Monitoring |
Rating | —/100 | 85/100 |
| Feature | Robusta | Nagios |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| Editorial Score | — | 85 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | MonitoringIncident Management | MonitoringIncident Management |
How Robusta and Nagios Compare
Robusta
Automated cloud troubleshooting and Kubernetes observability with Agentic AI.
Free tier available
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Free tier available · 85/100 score
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Robusta
Want the highest-rated option?
Nagios scores 85/100. Robusta is unrated.
Go with: Nagios
Value user reviews?
Neither has user reviews yet.
Go with: Nagios
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Both are monitoring tools. Compare their specific features to decide.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Nagios
- Higher score: 85/100 vs unrated
- Free tier available
- Our pick for this comparison
Robusta
The Bottom Line
Nagios (85/100) is our pick.
Frequently Asked Questions
Is Robusta or Nagios better?
Nagios scores 85/100 in our evaluation. Both are freemium.
What are Robusta and Nagios used for?
Robusta: Automated cloud troubleshooting and Kubernetes observability with Agentic AI.. Nagios: The industry standard in open-source IT monitoring tools for servers, networks, applications, and services..
What does Robusta cost vs Nagios?
Robusta is freemium (free tier + paid plans). Nagios is freemium (free tier + paid plans). Visit their websites for detailed pricing.