Nagios vs Opservo: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Nagios and Opservo side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, 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:
- • You want legacy monitoring standard
Opservo
See what’s running, why servers are slow or broken, and how to fix them
Best for you if:
- • Teams of 2–20 engineers running 5–50 Linux servers (AWS or VPS) without a dedicated SRE
| At a Glance | Nagios | Opservo |
|---|---|---|
Starts at | Free plan | Free plan, paid from $9.50/mo, billed yearly Agency plan |
Category | Monitoring Cloud & Infrastructure | Monitoring DevOps |
Rating | 4.5/5 G2 4.5 58 reviews | n/a |
Free plan | Yes | Yes |
Watch out for | n/a | 10-server minimum on Agency |
Choose Nagios or Opservo?
Choose Nagios if
- You want legacy monitoring standard
- You want highly customizable
Choose Opservo if
- Teams of 2–20 engineers running 5–50 Linux servers (AWS or VPS) without a dedicated SRE
- You want see what’s running, why servers are slow or broken, and how to fix them
In-Depth Analysis
Nagios
The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.
Nagios' pricing model, with a robust free tier and one-time purchase options for commercial versions, is quite generous compared to many subscription-based monitoring tools.
Strengths
- Pro: Legacy monitoring standard
- Pro: Highly customizable
- Pro: Large plugin library
- Pro: Free and open source
- Pro: Battle-tested
Weaknesses
- Con: UI very dated
- Con: Configuration complex
- Con: Scaling difficult
- Con: Setup time-consuming
- Con: Alternatives more modern
Key features
Opservo
See what’s running, why servers are slow or broken, and how to fix them
Opservo's pricing is fair and competitive for SMBs and agencies, with a generous free tier for up to 2 servers and a popular Growth tier at $12/server/mo that includes autonomous fixes and deploy/rollback.
Watch out
10-server minimum on Agency
Key features
Plans and prices: Nagios vs Opservo
| Tool | Plans and prices | Source |
|---|---|---|
| Nagios |
| nagios.org read Sep 30, 2026 |
| Opservo |
| getopservo.com/pricing read Oct 15, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Nagios pricing and Opservo pricing.
Key Takeaways
Nagios
- Choose if you want the industry standard in open-source IT monitoring tools for servers, networks, applications, and services
Opservo
- Choose if you want see what’s running, why servers are slow or broken, and how to fix them
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Only Nagios has a published user rating (4.5/5 from 58 reviews); Opservo has none we can show.
- Opservo starts at $9.50/mo, billed yearly; Nagios has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Nagios and Opservo compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Only Nagios has a published user rating (4.5/5 from 58 reviews); Opservo has none we can show. Opservo starts at $9.50/mo, billed yearly; Nagios has no public paid plan price on file. Both have a free plan.
What are Nagios and Opservo used for?
Nagios: The industry standard in open-source IT monitoring tools for servers, networks, applications, and services. Opservo: See what’s running, why servers are slow or broken, and how to fix them.
What does Nagios cost vs Opservo?
Nagios has no public paid-plan price on file. Opservo's cheapest paid plan is Agency at $9.50/mo, billed yearly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 15, 2026.
What's the main difference between Nagios and Opservo?
Nagios's main strength: legacy monitoring standard. Opservo focuses on see what’s running, why servers are slow or broken, and how to fix them.