Uptime Kuma vs Nagios
Nagios has monitored infrastructure for over 20 years: hosts, services, plugins, NRPE, active and passive checks, defined in text config files behind a CGI web interface. Nagios Core is free; Nagios XI, the commercial edition with a modern UI and wizards, starts at $2,595 for 100 nodes. Uptime Kuma is a web UI you set up in a minute. Here is when the old guard still earns its place.
Uptime Kuma vs Nagios: The Verdict
Uptime Kuma is the answer if you want to paste a URL, get an alert and publish a status page, and you want it running today. Nagios is the answer if you already run it, if you need its plugin ecosystem (thousands of checks for everything from SNMP to SAP), or if you monitor a large estate with host and service dependencies and escalations. Nagios Core is free but every host and service is a block in a config file, and the stock web UI is a CGI interface that has not changed much in a decade. Nagios XI fixes the UI and adds wizards, reports and an API, at $2,595 for 100 nodes on the Standard edition. Nothing in Nagios gives you a public status page.
Last updated: 2026-09-18Quick Comparison
| Feature | Nagios | Uptime Kuma |
|---|---|---|
| Scope | Full host and service monitoring with a plugin for everything | Uptime monitoring: HTTP, TCP, DNS, ping, keyword, JSON, push, Docker |
| How You Add a Check | Core: edit host and service definitions in config files, verify, restart. XI: wizards | Paste a URL in the web UI and save |
| Price | Core: free. XI Standard: $2,595 for 100 nodes; Enterprise $4,690 | Free software; $3/mo pod on InstaPods |
| Web UI | Core: CGI interface. XI: modern dashboards | Modern single-page app |
| Plugin Ecosystem | Thousands of community plugins, NRPE, NCPA, SNMP | Built-in monitor types only |
| Host Metrics (CPU, RAM, disk) | Yes - via agents and plugins | No |
| Dependencies and Escalations | Yes - host/service dependencies, escalation chains | Basic - monitor groups and retries |
| Public Status Page | No | Multiple pages, each mappable to its own domain |
| Notifications | Command-based; anything you can script | 90+ notification services from the UI |
| Check Interval | Configurable per service | Down to 20 seconds |
| License | Core: GPL-2.0. XI: commercial | MIT |
| 1-Click on InstaPods | No - compile or package-install Core yourself | Yes - $3/mo, launches ready to use |
What Is Harder With Nagios?
Trade-offs to weigh before committing.
Config Files Are the Interface
In Nagios Core a monitored website is a host definition plus a service definition using check_http, written in an object config file, verified with nagios -v, then applied with a restart. There is no button. Nagios XI adds configuration wizards, but that is the paid edition.
The Free UI Shows Its Age
Nagios Core ships a CGI web interface that lists hosts and services and not much else. It works, and it looks like it did in 2010. The dashboards, graphs and reports people expect are in Nagios XI.
Nagios XI Starts at $2,595
The commercial edition is licensed by node count: Standard is $2,595 for 100 nodes, $4,395 for 200 and $14,995 for 1,000; Enterprise is $4,690 for 100 (prices checked 2026-09-18). For a small fleet that wants a nicer UI, it is a large step from free.
No Status Page
Nagios is built for operators. There is no customer-facing status page with incident history and a custom domain in Core or XI. If you need one, you add another tool.
Why Pick Uptime Kuma Instead?
What you get when you pick this stack.
First Check in a Minute
Paste a URL, pick a type, set an interval, save. No object definitions, no nagios -v, no restart. The app is one Node process with its own SQLite database.
A Modern UI for Free
Response-time charts, uptime percentages, monitor groups and 90+ notification services, all in the open-source app. You do not pay $2,595 to get a screen that is pleasant to use.
Status Pages Included
Multiple status pages, each mappable to its own domain, with grouped monitors, branding and incident posts. Neither Nagios Core nor XI has this.
Runs on a $3/mo Server
Uptime Kuma is comfortable on 1 vCPU and 512MB, so it can sit on a cheap pod far from the servers it watches and keep alerting when they go dark.
Real Cost Comparison
Watching 20 endpoints and publishing a status page for a year (prices checked 2026-09-18).
- Nagios Core: free (GPL-2.0), but 20 host and service definitions to write and a $5-10/mo VPS to run it
- Or Nagios XI Standard: $2,595 for up to 100 nodes for the modern UI and wizards
- No status page in either edition
- Hours to install, configure and maintain
- InstaPods Launch plan: $3/mo (1 vCPU, 512MB RAM, 10GB)
- Uptime Kuma: free and open source (MIT)
- Instant launch with HTTPS and a domain already wired up
- 20 endpoints, unlimited monitors, status pages included
Frequently Asked Questions
Is Nagios still worth using in 2026?
If you already run it, or you need its plugin ecosystem and dependency model across a large estate, yes. For a handful of websites and APIs it is a lot of config-file work for a job Uptime Kuma does from one form.
Is Nagios free?
Nagios Core is free and open source under GPL-2.0. Nagios XI, the commercial edition with a modern UI, wizards, reports and an API, starts at $2,595 for 100 nodes on the Standard edition and $4,690 on Enterprise (prices checked 2026-09-18).
Can Nagios monitor a website?
Yes. The check_http plugin tests HTTP and HTTPS endpoints for status codes, strings and certificate expiry, and there are plugins for DNS, TCP, ping and much more. You define each as a service in a config file (Core) or through a wizard (XI).
Can Uptime Kuma replace Nagios?
For uptime monitoring and status pages, yes. For host metrics, SNMP devices, service dependencies and the long tail of plugins, no. Many teams keep Nagios for the estate and add Uptime Kuma for the outside-in check and the public status page.
Which one has a public status page?
Uptime Kuma. It ships multiple status pages, each mappable to its own domain, with incident posts. Nagios Core and XI have no status page.
Can I run Nagios on InstaPods?
Not as a 1-Click app. A pod is a real Linux server with SSH, so you can install Nagios Core from packages or source yourself. Uptime Kuma is the one-click option.
Where should the uptime monitor run?
Anywhere except the machine it is watching. A monitor on the same box dies with that box. A $3/mo pod somewhere else is the cheapest way to make sure the alert fires.
Want the Web UI at $3/mo? Deploy It in 60 Seconds
Nagios earned its reputation. If what you need is uptime checks and a status page without config files or a $2,595 licence, Uptime Kuma launches on InstaPods for $3/mo, off the box you are watching, with HTTPS and a domain already wired up.
Deploy Uptime Kuma