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Top 8 Free PRTG Network Monitor Alternatives, Compared (2026)

Explore 8 alternatives to PRTG Network Monitor — vetted by our editors with real user reviews, pricing, and feature comparisons.

8 free PRTG Network Monitor alternatives, ranked at a glance

Quick answer

The most popular free network monitoring software alternatives to PRTG Network Monitor are ManageEngine OpManager, Nagios XI and ManageEngine OpManager MSP. ManageEngine OpManager tops the ranking with a SpotScore of 9.6 and 4.66★ from users. Compare all 8 on score, rating, and pricing below.

If the value just isn't there with PRTG Network Monitor anymore, these 8 network monitoring software free alternatives are worth weighing. We rank by SpotScore (real-user satisfaction and market presence), star ratings, and pricing model, and our editors vet each pick. Scan the table for a quick view, then read the sections below for the why.

ProductSpotScoreRatingPricingBest for
ManageEngine OpManagerStreamline server management with ease.9.6★★★★★ 4.66(72)FreeFree Trial · One-time license · Quotation Basedteams of all sizes
Nagios XIEmpower Your IT Decisions with Proactive Monitoring.9.5★★★★☆ 4.36(15)FreeFree Trial · Freemium · One-time license · Open-sourceteams of all sizes
ManageEngine OpManager MSPElevate your network management capabilities.8.8Not yet ratedFreefrom $795teams of all sizes
OP5 MonitorEfficiently monitor your entire network with ease.8.6★★★☆☆ 2.5(1)FreeFree Trial · Quotation Basedteams of all sizes
SolarWinds ipMonitorMaximize network efficiency with real-time monitoring.8.2★★★★★ 4.55(10)FreeFree Trial · Quotation Basedteams of all sizes
SolarWinds Network Performance MonitorKeep your network performing at its best.8.2★★★★★ 4.54(210)FreeFree Trial · Subscription · Quotation Basedteams of all sizes
Nagios Network AnalyzerMaximize uptime with Nagios network monitor.8.1★★★★☆ 4.17(28)FreeFree Trialteams of all sizes
NinjaOneAutomate the hardest parts of IT—★★★★★ 4.76(967)Freefrom $1.50 /user/monthteams of all sizes

9.6

SpotScore

ManageEngine OpManager - Load Balancing Software

ManageEngine OpManager

Streamline server management with ease.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.7

72 verified reviews

Add to compare

What is ManageEngine OpManager?

ManageEngine OpManager is a comprehensive server and network management solution that provides a unified view of the network under one console. It includes pre-defined reports, alerts and notifications, automated tasks, etc. MP configurations can be created using 'drag-and-drop' functionality ...

Read more about ManageEngine OpManager
Free Trial·

ManageEngine OpManager offers custom pricing plan

9.5

SpotScore

Nagios XI - Network Monitoring Software

Nagios XI

Empower Your IT Decisions with Proactive Monitoring.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.4

15 verified reviews

Add to compare

What is Nagios XI?

Nagios XI is a powerful network monitoring platform designed to help organizations worldwide make important IT infrastructure decisions with confidence. Powerful integrated add-ons allow for distributed IT management, DevOps integration, and proactive problem resolution when things go wrong. It ...

Read more about Nagios XI
Free TrialTry Free →

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8.8

SpotScore

ManageEngine OpManager MSP - Network Monitoring Software

ManageEngine OpManager MSP

Elevate your network management capabilities.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

Add to compare

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What is ManageEngine OpManager MSP?

ManageEngine OpManager MSP is the perfect tool for service providers and IT admins to observe and control their customers' networks. From one convenient location, it can track over 2000 metrics of several 10,000 device varieties, delivering distinctive reports to every user manager so they can ...

Read more about ManageEngine OpManager MSP
Free TrialTry Free →·

ManageEngine OpManager MSP offers custom pricing plan

8.6

SpotScore

OP5 Monitor - Network Monitoring Software

OP5 Monitor

Efficiently monitor your entire network with ease.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

2.5

1 verified reviews

Add to compare

What is OP5 Monitor?

OP5 Monitor is a powerful non-intrusive network monitoring software application that allows user to monitor, troubleshoot, and archive performance of routers, switches, firewalls, servers, application servers, workstations and other devices. OP5 Monitor provides superior interface, agent maker ...

Read more about OP5 Monitor
Free Trial·

OP5 Monitor offers custom pricing plan

8.2

SpotScore

SolarWinds ipMonitor - Network Monitoring Software

SolarWinds ipMonitor

Maximize network efficiency with real-time monitoring.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.5

10 verified reviews

Add to compare

What is SolarWinds ipMonitor?

SolarWinds ipMonitor provides network administrators with an easy-to-use, affordable way to monitor the performance of business's network. With ipMonitor, user can troubleshoot effectively by obtaining real-time information about devices, ports, CPU utilization, disk space, and more! It allows ...

Read more about SolarWinds ipMonitor
Free Trial·

SolarWinds ipMonitor offers custom pricing plan

8.2

SpotScore

SolarWinds Network Performance Monitor - Network Monitoring Software

SolarWinds Network Performance Monitor

Keep your network performing at its best.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.5

210 verified reviews

Add to compare

What is SolarWinds Network Performance Monitor?

SolarWinds Network Performance Monitor (NPM) provides a powerful and budget friendly solution for network monitoring. Detect and resolve network performance issues and outages without delay. An ideal choice for both online and onsite monitoring scenarios. Get the best of both worlds for an ...

Read more about SolarWinds Network Performance Monitor
Free TrialTry Free →·

SolarWinds Network Performance Monitor offers custom pricing plan

8.1

SpotScore

Nagios Network Analyzer - Network Monitoring Software

Nagios Network Analyzer

Maximize uptime with Nagios network monitor.

Best for: SMB teams · Mid-market · Enterprise

Start Free Trial

4.2

28 verified reviews

Add to compare

What is Nagios Network Analyzer?

Nagios network monitor, is a network monitoring software, has become the standard for reducing downtime and improving the reliability of IT infrastructures. Used by tens of thousands of organizations, across all industries, Nagios network monitor is an open source system that monitors hardware ...

Read more about Nagios Network Analyzer
Free TrialTry Free →
NinjaOne - Remote Monitoring and Management Software

NinjaOne

Automate the hardest parts of IT

Best for: SMB teams · Mid-market · Enterprise

Try for Free

4.8

967 verified reviews

Add to compare

watch-demo

Watch Demo

What is NinjaOne?

NinjaOne, the automated endpoint management platform, delivers visibility, security, and control over all endpoints for more than 30,000 customers in 130+ countries. The cloud-native NinjaOne platform simplifies endpoint management, patching, and visibility for environments at any scale. It is ...

Read more about NinjaOne
Free TrialTry Free →·

NinjaOne offers custom pricing plan

Why each tool made the shortlist

ManageEngine OpManager9.6Best for teams of all sizes

Monitors the full network and server environment from a single view.

Watch for: New users face a steep learning curve and require training to use all features effectively.

Nagios XI9.5Best for teams of all sizes

Highly effective in monitoring large network end-to-end, providing detailed information on uptime, downtime, and device failures.

Watch for: Occasional app hangs affecting user experience.

ManageEngine OpManager MSP8.8Best for teams of all sizes

Tracks 2000+ metrics

Watch for: Can be overwhelming for new users

OP5 Monitor8.6Best for teams of all sizes

Non-intrusive monitoring

Watch for: Steeper learning curve

SolarWinds ipMonitor8.2Best for teams of all sizes

User-friendly interface

Watch for: Limited advanced features

SolarWinds Network Performance Monitor8.2Best for teams of all sizes

Powerful network monitoring

Watch for: May require technical expertise

Nagios Network Analyzer8.1Best for teams of all sizes

Open source and customizable

Watch for: Steep learning curve

NinjaOneBest for teams of all sizes

Automates IT management tasks, reducing manual effort.

Watch for: Learning curve for comprehensive features may be challenging initially.

Why teams look for a PRTG Network Monitor alternative

Before comparing options, it helps to name why teams leave PRTG Network Monitor in the first place:

  • New users may need significant time to learn the full feature set without formal training.
  • Marketplace has limited options for additional apps and connectors, restricting advanced customization.

What to look at before switching from PRTG Network Monitor

Here's the data-driven picture across all 8 network monitoring software free alternatives: 8 offer a free tier; paid plans run $1.5–$795, with NinjaOne the cheapest entry point; and NinjaOne is the highest rated at 4.76★ across 967 reviews.

Behind the order.

Frequently Asked Questions (FAQs)

Stuck on something? We're here to help with all the questions and answers in one place.

The top-rated alternatives to PRTG Network Monitor are NinjaOne (4.8★), ManageEngine OpManager (4.7★), SolarWinds ipMonitor (4.5★). Compare all 8 alternatives side-by-side above.

When evaluating alternatives to PRTG Network Monitor, prioritize: Resource Management, Bandwidth Monitoring, Baseline Manager, Diagnostic Tools, Internet Usage Monitoring, transparent pricing, free trial availability, and integrations with your existing tools. Use the filters above to compare by feature, budget, and team size.

Migration difficulty depends on how deeply PRTG Network Monitor is integrated into your workflows. Most alternatives offer data export/import tools and dedicated onboarding support. We recommend shortlisting 2–3 options, running a free trial, and checking each vendor's migration guides before committing.

Choosing the best PRTG Network Monitor alternative for your goals

The switch from PRTG Network Monitor

A low-stress switch from PRTG Network Monitor starts with exporting your data and confirming the new tool imports it. Check feature parity for your real workflows, run a short pilot, and keep PRTG Network Monitor active until the move is finished. The free tiers above let you trial first.

Disclaimer: This research has been collated from a variety of authoritative sources. We welcome your feedback at [email protected].