Nagios vs OnlineOrNot: 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 OnlineOrNot 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
OnlineOrNot
Uptime monitoring and status pages for websites, APIs, and scheduled tasks.
Best for you if:
- • You want detects downtime quickly with checks as frequent as every 30 seconds
| At a Glance | Nagios | OnlineOrNot |
|---|---|---|
Starts at | Free plan | Free plan, paid from $12/mo, billed monthly Pro plan |
Category | Monitoring Cloud & Infrastructure | Monitoring Status Pages |
Rating | 4.5/5 G2 4.5 58 reviews | 4.9/5 G2 4.9 · Capterra 5.0 6 reviews |
Free plan | Yes | Yes |
Choose Nagios or OnlineOrNot?
Choose Nagios if
- You want legacy monitoring standard
- You want highly customizable
Choose OnlineOrNot if
- You want detects downtime quickly with checks as frequent as every 30 seconds
- You want minimizes support load by keeping customers informed via status pages
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
OnlineOrNot
Uptime monitoring and status pages for websites, APIs, and scheduled tasks.
OnlineOrNot offers a very generous Free tier, making it accessible for small projects and personal use.
Strengths
- Pro: Detects downtime quickly with checks as frequent as every 30 seconds
- Pro: Minimizes support load by keeping customers informed via status pages
- Pro: Highly configurable monitoring options for various use cases
- Pro: Integrates with a wide range of popular incident management and communication tools
- Pro: Customer-backed and responsive to user feedback for continuous improvement
Weaknesses
- Con: Advanced features like browser checks and additional status pages are add-ons or part of higher tiers
- Con: Custom domains for status pages are not available on the free tier
- Con: Data retention for historical uptime is limited on lower tiers
Key features
Plans and prices: Nagios vs OnlineOrNot
| Tool | Plans and prices | Source |
|---|---|---|
| Nagios |
| nagios.org read Sep 30, 2026 |
| OnlineOrNot |
| onlineornot.com/pricing read Oct 24, 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 OnlineOrNot pricing.
Key Takeaways
Nagios
- Choose if you want the industry standard in open-source IT monitoring tools for servers, networks, applications, and services
OnlineOrNot
- Choose if you want uptime monitoring and status pages for websites, APIs, and scheduled tasks
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.
- User ratings rest on too few reviews to rank (4.5/5 from 58 reviews for Nagios, 4.9/5 from 6 reviews for OnlineOrNot; we compare ratings only above 20 reviews on both sides).
- OnlineOrNot starts at $12/mo, billed monthly; 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 OnlineOrNot 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. User ratings rest on too few reviews to rank (4.5/5 from 58 reviews for Nagios, 4.9/5 from 6 reviews for OnlineOrNot; we compare ratings only above 20 reviews on both sides). OnlineOrNot starts at $12/mo, billed monthly; Nagios has no public paid plan price on file. Both have a free plan.
What are Nagios and OnlineOrNot used for?
Nagios: The industry standard in open-source IT monitoring tools for servers, networks, applications, and services. OnlineOrNot: Uptime monitoring and status pages for websites, APIs, and scheduled tasks.
What does Nagios cost vs OnlineOrNot?
Nagios has no public paid-plan price on file. OnlineOrNot's cheapest paid plan is Pro at $12/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 24, 2026.
What's the main difference between Nagios and OnlineOrNot?
Nagios's main strength: legacy monitoring standard. OnlineOrNot's main strength: detects downtime quickly with checks as frequent as every 30 seconds.