Head-to-Head Comparison · Alternative to Paessler PRTG · 📟 monitoring
Paessler PRTG vs Nagios
Free open source IT monitoring solution for servers, networks, and applications. Trusted by 1M+ users worldwide with powerful alerting and enterprise-grade features. Here is how Nagios ($0/mo open source) stacks up against Paessler PRTG ($35/mo) across cost, hosting, data privacy, and real-world trade-offs.
Nagios is a verified Open Source-licensed open-source replacement for Paessler PRTG. Switching from Paessler PRTG ($35/mo) saves $420/yr per solo seat, or $2,100/yr for a 5-person team. Deployment: Runs on Self-host.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed Paessler PRTG.
Paessler PRTG vs Nagios Specifications
facts verified 2026-11-07
| Dimension | Paessler PRTG (Paid) | Nagios (Replacement) |
|---|---|---|
| Monthly Price | $35 / mo | $0 / mo |
| 1-Year Cost (1 seat) | $420 / yr | $0 / yr (Save $420) |
| 1-Year Cost (5 seats) | $2,100 / yr | $0 / yr (Save $2,100) |
| 1-Year Cost (10 seats) | $4,200 / yr | $0 / yr (Save $4,200) |
| Source & License | Proprietary SaaS | open source Open Source |
| Where It Runs | Vendor Cloud | Self-host (your server) |
| Platforms | Web / Cloud | webself-hosteddocker to self-host |
| GitHub Stars | — | ★ 2.1k (active nov 2026) |
Deep Dive: Switching from Paessler PRTG to Nagios
Trade-offs, installation & data architecture
What you trade away
Requires self-hosting setup, updates, and server maintenance compared to managed Paessler PRTG.
How to deploy Nagios
Clone https://github.com/nagiosenterprises/nagioscore or deploy with Docker Compose
What it takes to run
Deploy via Docker or binary release from GitHub and configure environment variables.
Where your data lives
All application data and configuration live on your own server or local database.
Why fork Nagios instead of vibe-coding a Paessler PRTG clone?
Instead of paying recurring SaaS fees for Paessler PRTG or rebuilding it from scratch, deploy one of the 6 battle-tested open-source alternatives like NetData.
Paessler PRTG vs Nagios FAQ
Is Nagios a good free alternative to Paessler PRTG?+
Yes. Nagios is a verified open-source (Open Source) replacement for Paessler PRTG. Free open source IT monitoring solution for servers, networks, and applications. Trusted by 1M+ users worldwide with powerful alerting and enterprise-grade features.
What is the catch when switching from Paessler PRTG to Nagios?+
Requires self-hosting setup, updates, and server maintenance compared to managed Paessler PRTG.
How much do you save switching from Paessler PRTG to Nagios?+
Paessler PRTG costs $35/mo ($420/yr) per seat, whereas Nagios is $0/mo. Switching saves $420/yr for a solo user, $2,100/yr for a 5-person team, and $4,200/yr for a 10-person team.
How do I install or self-host Nagios instead of Paessler PRTG?+
Install: Clone https://github.com/nagiosenterprises/nagioscore or deploy with Docker Compose. Setup: Deploy via Docker or binary release from GitHub and configure environment variables.
