Nagios vs Datadog: Which is Better in 2026?
Choosing between Nagios and Datadog 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.
Short on time? Here's the quick answer
We've tested both tools. 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:
- • 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).
Datadog
Cloud monitoring, security, and AI investigations for DevOps
Best for you if:
- • Cloud monitoring and security platform
- • Unified observability across infrastructure
| At a Glance |  Nagios |  Datadog |
|---|---|---|
Starts at | $1995/moXI Standard | $15/host/month (annual)Infrastructure Pro |
Best For | Monitoring | Monitoring |
Rating | - | - |
Choose Nagios or Datadog?
Choose Nagios if
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
- Legacy monitoring standard
- Highly customizable
- Large plugin library
Choose Datadog if
Cloud monitoring, security, and AI investigations for DevOps
- Comprehensive platform
- Great visualizations
- 700+ integrations
- Budget matters ($15/host/month (annual) vs $1995/mo)
| Feature | Nagios | Datadog |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | ★4.6/5 192 reviews | ★4.4/5 1,156 reviews |
| Categories | MonitoringDevOps | MonitoringLog Management |
In-Depth Analysis
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Strengths
- +Legacy monitoring standard
- +Highly customizable
- +Large plugin library
- +Free and open source
- +Battle-tested
Weaknesses
- -UI very dated
- -Configuration complex
- -Scaling difficult
- -Setup time-consuming
- -Alternatives more modern
Key features
Datadog
Cloud monitoring, security, and AI investigations for DevOps
Strengths
- +Comprehensive platform
- +Great visualizations
- +700+ integrations
Weaknesses
- -Complex pricing
- -Can be expensive
Key features
Pricing: Nagios vs Datadog
| Plan | Nagios | Datadog |
|---|---|---|
| Tier 1 | Free Core (Free) | Free Free |
| Tier 2 | $1995 XI Standard | $15 /host/month (annual) Infrastructure Pro |
| Tier 3 | $3495 XI Professional | $23 /host/month (annual) Infrastructure Enterprise |
| Tier 4 | N/A | $31 /host/month (annual, with Infra) APM |
| Tier 5 | N/A | $40 /host/month (annual, with Infra) APM Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Nagios pricing and Datadog pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Nagios
Want the highest-rated option?
Neither has user reviews yet.
Go with: Nagios
Value user reviews?
Neither has user reviews yet.
Go with: Datadog
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?
Neither has user reviews yet.
Key Takeaways
Datadog
- Larger review base (1,156 reviews)
- Free tier available
- Our pick for this comparison
Nagios
- Higher user rating: 4.6/5 vs 4.4/5
The Bottom Line
Datadog is our pick.
Frequently Asked Questions
Is Nagios or Datadog better?
Datadog is rated in our evaluation. Both are freemium.
What are Nagios and Datadog used for?
Nagios: The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.. Datadog: Cloud monitoring, security, and AI investigations for DevOps.
What does Nagios cost vs Datadog?
Nagios is freemium (free tier + paid plans). Datadog is freemium (free tier + paid plans). Visit their websites for detailed pricing.