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It's a split decision.
Choose Datadog if your team wants one platform spanning infrastructure, application performance, logs, security, and software delivery, and can manage usage costs. Choose Nagios XI if self-hosting, active polling, and a large plugin ecosystem matter more than consolidated observability features. Its free edition has a small cap, while paid licenses are one-time node tiers. Datadog’s listed AI Credits price is an add-on price, not a quote for the full platform.
01Side by side
| Datadog | Nagios XI | |
|---|---|---|
| Pricing model | AI Credits: $500/500 monthly, billed annually | One-time node-tier licenses; free edition |
| Free tier | No free plan listed | Up to 7 nodes or 100 services |
| Open source and license | Open-source status not stated | Open-source offering; exact license unspecified |
| Self-hosting | Self-hosting status not stated | Self-hosted on Windows or Linux |
| Integrations | AWS, Azure, Kubernetes, OpenTelemetry, and others | Thousands of plugins, including NCPA, NRPE, NSCA |
| Platforms | Web | Windows and Linux |
| Monitoring coverage | Observability, security, experience, and software delivery | Servers, networks, applications, and services |
| Monitoring approach | Integrated platform across telemetry and security | Active polling with plugin extensions |
Datadog Choose Datadog if
- Choose Datadog if you want observability and security in one platform.
- Choose Datadog if you monitor infrastructure, applications, logs, and user experience.
- Choose Datadog if you need named integrations such as OpenTelemetry and major cloud platforms.
Nagios XI Choose Nagios XI if
- Choose Nagios XI if self-hosting on Windows or Linux matters.
- Choose Nagios XI if you want active polling and plugin-based extensions.
- Choose Nagios XI if one-time node-tier licenses fit your budget.
02Pricing at real usage
Nagios XI has a free edition capped at 7 nodes or 100 services, whichever comes first, and a 30-day free trial. Paid Standard licenses cost $2,595 for 100 nodes and $14,995 for 1,000; Enterprise costs $4,690 and $17,090 at those tiers. Both are one-time licenses with unlimited services per licensed node. The first year of Maintenance & Support is included; renewal prices are not published. Datadog has no free plan listed. Its stated AI Credits plan costs $500 per 500 credits per month when billed annually, or $1.30 per credit on demand. Those credits cover specified AI features, not the full platform. Datadog’s overall observability pricing is not captured by that add-on price, so request a quote based on expected usage.
03API, SDKs and integration
Datadog is an integrated platform spanning infrastructure, applications, logs, security, digital experience, and software delivery. Its listed integrations include AWS, Azure, Google Cloud, Kubernetes, OpenTelemetry, OpenAI, and SAP. Nagios XI monitors through active polling and extends its coverage with plugins and add-ons, including NCPA, NRPE, and NSCA; Nagios says its ecosystem includes thousands of plugins. That points to different integration paths: connect telemetry and services to Datadog’s platform, or configure polling checks and plugins in Nagios XI. The vendors do not publish API styles, SDK language coverage, or CLI details in the product facts available for this comparison. Confirm those interfaces and the relevant documentation before committing to custom instrumentation or automation. Nagios XI also offers enterprise dashboards and configuration tools for teams moving from Nagios Core, though migration still involves configuration work.
04Open source, self-hosting and lock-in
Nagios XI is part of Nagios’s open-source monitoring offering and can be self-hosted on Windows or Linux. Nagios does not name the specific license in the product facts for XI, so confirm the license terms that apply to your deployment. Its plugin model and active polling give teams control over monitoring configuration, but moving from Nagios Core requires configuration and migration work. Datadog’s open-source status and self-hosting options are not stated; its platform is listed as Web. A broader integrated platform can concentrate more monitoring and security work in one vendor, so evaluate the impact of leaving it on your workflows and telemetry. Before adopting either product, ask about supported data export formats, retention, and how exported data can be used elsewhere.
Questions people ask
Is Datadog or Nagios XI cheaper?
Nagios XI has a free edition for up to 7 nodes or 100 services, then one-time node-tier licenses. Datadog’s listed AI Credits price is $500 per 500 credits monthly with annual billing, or $1.30 per credit on demand. That is an add-on price, not a comparable full-platform quote.
Can Nagios XI be self-hosted?
Yes. Nagios XI is self-hostable and lists Windows and Linux as supported platforms. It monitors systems through active polling and can be extended with plugins, including NCPA, NRPE, and NSCA.
Does Datadog support OpenTelemetry?
Yes. OpenTelemetry is among the integrations Datadog lists, alongside AWS, Azure, Google Cloud, Kubernetes, OpenAI, and SAP. The product facts here do not specify API styles, SDK languages, or CLI details, so verify the interfaces your instrumentation requires.
How do Nagios XI and Datadog scale?
Nagios XI licenses are sold in node tiers, with unlimited services per licensed node; 2,000-plus-node pricing requires contacting sales. Datadog’s listed AI Credits plan has a monthly credit allowance and on-demand pricing, but that does not describe the full platform’s usage limits.