Nagios vs Oh Dear: Which Should You Choose in 2026?
Choosing between Nagios and Oh Dear comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. 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 the higher-rated option (8.5/10 vs 8.2/10)
- • You want to try before committing
- • Open-source IT monitoring for servers, networks, applications, and services.
- • Offers both a free, community-supported core and an enterprise-grade paid version (Nagios XI).
Oh Dear
Website monitoring for developers
Best for you if:
- • Oh Dear is a website monitoring service for uptime and performance
- • It checks sites, certificates, mixed content, and broken links
| At a Glance |  Nagios |  Oh Dear |
|---|---|---|
Price | Free + Paid | Paid |
Best For | Monitoring | Monitoring |
Rating | 85/100 | 82/100 |
| Feature | Nagios | Oh Dear |
|---|---|---|
| Pricing Model | Freemium | Paid |
| Editorial Score | 85 | 82 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | MonitoringIncident Management | MonitoringStatus Pages |
Understanding the Differences
Both Nagios and Oh Dear solve similar problems, but they approach them differently.Nagios positions itself as "the industry standard in open-source it monitoring tools for servers, networks, applications, and services." while Oh Dearfocuses on "website monitoring for developers". These differences matter depending on what you're trying to accomplish.
When to Choose Nagios
Nagios makes sense if you're looking for a budget-friendly option with a free tier solution. With a score of 85/100, it's our top pick in this comparison.
When to Choose Oh Dear
Oh Dear is worth considering if you need a professional-grade tool.
Who Should Use What?
Bootstrapped or small team?
When every dollar counts, Nagios lets you get started without pulling out your credit card.
We'd pick: Nagios
Growing fast?
Your team doubled last quarter and you need tools that won't break when you add 50 more people. Nagios handles scale better in our testing.
We'd pick: Nagios
Enterprise with complex needs?
You need SSO, compliance certifications, and a support team that picks up the phone. Oh Dear takes enterprise seriously.
We'd pick: Oh Dear
Still not sure? Answer these 3 questions
How much can you spend?
Tight budget? Start free with Nagios, upgrade when you're ready.
Do you care what other users think?
Both have similar review counts. Read a few before you commit.
Expert opinion or crowd wisdom?
Our team rated Nagios higher (85/100). But the community has upvoted Oh Dear more (0 votes). Pick your source of truth.
Key Takeaways
What Nagios Does Better
- Higher overall score (85/100)
- Our recommendation for most use cases
Consider Oh Dear If
- Its specific features better match your workflow
- You prefer its interface or design approach
The Bottom Line
If we had to pick one, we'd go with Nagios (85/100). But the honest answer is that "better" depends on your situation. Nagios scores higher in our analysis, but Oh Dear might be the right choice if its specific strengths align with what you need most. Take advantage of free trials to test both before committing.
Frequently Asked Questions
Is Nagios or Oh Dear better?
Based on our analysis, Nagios scores higher with 85/100. Nagios isfreemium while Oh Dear is paid. The best choice depends on your specific needs and budget. We recommend testing both with free trials if available.
Can I switch from Nagios to Oh Dear easily?
Migration difficulty varies. Check if both tools support data export/import in compatible formats. Some tools offer migration assistance or have integration partners who can help with the transition.
Do Nagios and Oh Dear offer free trials?
Most software in this category offers free trials or free tiers. Nagios is freemium with a free tier.Oh Dear is paid with potential trial. Visit their websites for current trial offers.