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It's a split decision.
Nagios XI is a self-hosted monitoring platform with an open-source plugin ecosystem, active polling, and a free tier capped at 7 nodes or 100 services. It suits teams that want infrastructure monitoring they can configure and run themselves. SolarWinds Observability offers SaaS, self-hosted, and hybrid deployment, plus a public API and monitoring across hybrid environments. Choose it when those deployment options matter; confirm SaaS pricing and API details with SolarWinds before committing.
01Side by side
| Nagios XI | SolarWinds Observability | |
|---|---|---|
| Pricing model | One-time, perpetual node-tier licenses | Per-node monthly; self-hosted starts at $8 |
| Free tier | Free: 7 nodes or 100 services | No free plan; 30-day trial |
| Open source and licence | Open source; licence name not specified | Open-source status not stated |
| Self-hosting | Self-hostable; Windows and Linux | Self-hosted behind firewall or in cloud |
| API and extensibility | Thousands of plugins and add-ons | Public API listed for SaaS |
| Integrations | NCPA, NRPE, NSCA, and other plugins | Third-party integrations; specifics not listed |
| Deployment model | Self-hosted monitoring with active polling | SaaS, self-hosted, or hybrid |
| Platforms | Windows and Linux | Web |
Nagios XI Choose Nagios XI if
- Choose Nagios XI if you want open-source, self-hosted monitoring.
- Choose Nagios XI if its free tier covers your small environment.
- Choose Nagios XI if you need a large plugin ecosystem.
SolarWinds Observability Choose SolarWinds Observability if
- Choose SolarWinds Observability if you need SaaS or hybrid deployment.
- Choose SolarWinds Observability if a public API is a requirement.
- Choose SolarWinds Observability if you monitor across cloud and on-premises systems.
02Pricing at real usage
Nagios XI has a free edition capped at 7 nodes or 100 services, whichever comes first. Paid editions use one-time perpetual node-tier licenses, with the first year of Maintenance & Support included. Standard costs $2,595 for 100 nodes; Enterprise costs $4,690 for 100 nodes. Both include unlimited services per licensed node. The listed tiers reach 1,000 nodes; 2,000+ requires contacting sales. Renewal pricing and user-seat limits are not published.
SolarWinds Observability Self-Hosted starts at $8 per node per month. Its SaaS plan is also priced per node per month, but the rate is not published. Both products offer a 30-day trial; SolarWinds does not list a free plan. SolarWinds says multi-year contracts are billed annually. At larger node counts, compare the perpetual license and support renewals with recurring per-node fees, and ask SolarWinds for a SaaS quote.
03API, SDKs and integration
Nagios XI extends through a plugin and add-on architecture. Nagios names NCPA, NRPE, and NSCA among thousands of plugins and add-ons, and its active polling checks device health, service availability, and performance. That gives teams an extension route for monitoring, but the product page does not describe an API contract or name SDKs and programming languages.
SolarWinds lists a public API and third-party integrations for Observability SaaS. Its product supports metrics, traces, logs, user experience, custom apps, microservices, Kubernetes, and containers. The product page does not specify the API protocol, authentication method, SDKs, or supported languages, so confirm those details before building an integration. SolarWinds says Observability can fit into an existing tech stack, but does not list specific integrations for the product. Neither vendor’s product page identifies a CLI. For both, check the documentation for API limits and supported integration paths before making them part of a production workflow.
04Open source, self-hosting and lock-in
Nagios XI is described as open source and self-hostable, with Windows and Linux listed as platforms. The product page does not name its licence, so check the licence terms for your distribution and modification plans. Nagios also positions XI as an upgrade path for teams moving from Nagios Core, with enterprise dashboards and easier configuration. Its plugin architecture offers extension options, but the product page does not specify a data-export workflow.
SolarWinds offers self-hosted deployment behind a firewall or in AWS, Azure, or GCP, as well as SaaS and hybrid options. Its open-source status is not stated. Neither product page describes data-export formats or a migration workflow, so ask about exporting metrics, logs, configuration, and alert history before adopting either. With SolarWinds SaaS, also confirm retention and exit procedures; with Nagios XI, plan for the configuration work involved in moving from Core.
Questions people ask
Which is cheaper, Nagios XI or SolarWinds Observability?
Nagios XI has a free edition for up to 7 nodes or 100 services, then one-time paid licenses starting at $2,595 for 100 nodes. SolarWinds Self-Hosted starts at $8 per node per month; SaaS pricing is not published. Compare your node count, support renewals, and SolarWinds quote.
Can Nagios XI replace Nagios Core?
Nagios positions XI as an option for teams moving from Nagios Core. It adds enterprise dashboards and easier configuration, while retaining Nagios monitoring and plugin capabilities. The vendor does not describe a complete migration procedure on the product page, so check the upgrade guidance for your Core configuration.
Can SolarWinds Observability be self-hosted?
Yes. SolarWinds lists Self-Hosted deployment behind a firewall or in AWS, Azure, or GCP, alongside SaaS and hybrid deployment options. Its self-hosted pricing starts at $8 per node per month. The vendor also offers a 30-day fully functional trial.
Does SolarWinds Observability have a public API?
SolarWinds lists a public API for Observability SaaS, but does not specify its protocol, authentication method, SDKs, or supported programming languages on the product page. Confirm those details, along with rate limits, in the documentation before designing an integration.