PRTG Network Monitor Freeware
Paessler GmbHExternal reviews
215 reviews
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External reviews are not included in the AWS star rating for the product.
Sensor-Based Licensing and Auto-Discovery Make Monitoring Easy to Justify
What do you like best about the product?
The sensor-based licensing actually helped me justify monitoring to management. I could show exactly what each sensor was doing instead of paying for vague “device counts.”
The auto-discovery worked surprisingly well in our mixed environment (VMware + physical switches + a few legacy servers). It didn’t just detect devices — it suggested useful default sensors.
I really appreciate the custom dashboards. I built a live NOC screen in under an hour without touching any complicated scripting.
Notifications are flexible. I was able to set up different alert thresholds for business hours vs after-hours without complex rule logic.
The auto-discovery worked surprisingly well in our mixed environment (VMware + physical switches + a few legacy servers). It didn’t just detect devices — it suggested useful default sensors.
I really appreciate the custom dashboards. I built a live NOC screen in under an hour without touching any complicated scripting.
Notifications are flexible. I was able to set up different alert thresholds for business hours vs after-hours without complex rule logic.
What do you dislike about the product?
When you scale beyond a few thousand sensors, you really start paying attention to probe performance tuning. It’s not “set and forget” at larger scale.
The UI, while functional, still feels slightly dated compared to newer SaaS monitoring tools.
Some advanced configuration settings are buried in menus that aren’t very intuitive.
The UI, while functional, still feels slightly dated compared to newer SaaS monitoring tools.
Some advanced configuration settings are buried in menus that aren’t very intuitive.
What problems is the product solving and how is that benefiting you?
We had intermittent WAN drops between two branch offices that weren’t being logged clearly. By creating custom QoS sensors, I could prove packet loss was happening upstream of our firewall — which saved us weeks of back-and-forth with our ISP.
It gave our small IT team visibility similar to what larger enterprises have, without hiring a dedicated monitoring engineer.
Reduced our average incident diagnosis time from “hours of guessing” to “15–20 minutes of checking historical graphs.”
It gave our small IT team visibility similar to what larger enterprises have, without hiring a dedicated monitoring engineer.
Reduced our average incident diagnosis time from “hours of guessing” to “15–20 minutes of checking historical graphs.”
Review about Paessler features
What do you like best about the product?
The ease of "Python Script" sensors. If a device doesn't support SNMP or REST API, I can just write a quick 10-line script to scrape a status page or check a file timestamp, and PRTG treats it like a native sensor with full alerting and graphing.
What do you dislike about the product?
The Core Server only runs on Windows. In a world where almost every other infrastructure tool has a lightweight Linux appliance or Docker container option, maintaining a dedicated Windows Server instance just for the monitoring core feels like unnecessary overhead and an extra OS license to manage.
What problems is the product solving and how is that benefiting you?
Resolved an "Intermittent Ghost" issue with our ISP. By using the Cloud HTTP sensors from different geographical probes, we gathered 30 days of jitter data that proved the ISP had a routing loop in their backbone. We presented the PRTG PDF report, and they finally escalated the ticket to their Tier 3 engineering.
Fast Setup with Accurate Sensor Templates and an Underrated Map Designer
What do you like best about the product?
What I genuinely like about PRTG is how quickly I could start monitoring without building everything from scratch. I moved from a tool where I had to manually configure every threshold and alert logic. In PRTG, the default sensor templates were surprisingly accurate for our Cisco switches and Windows servers.
Also, the sensor-based licensing model makes me think more carefully about what actually matters to monitor. Instead of monitoring everything blindly, I focus on meaningful metrics.
The map designer is underrated — I built a live NOC dashboard for management in one afternoon, and they loved the visual health indicators.
Also, the sensor-based licensing model makes me think more carefully about what actually matters to monitor. Instead of monitoring everything blindly, I focus on meaningful metrics.
The map designer is underrated — I built a live NOC dashboard for management in one afternoon, and they loved the visual health indicators.
What do you dislike about the product?
The probe architecture is powerful, but when you have multiple remote probes, troubleshooting communication delays between core and probe can get tricky. It’s not hard — just not very intuitive the first time.
Also, once you cross a few thousand sensors, performance tuning becomes necessary. It works well, but you need to understand how interval timing impacts database growth. That learning curve isn’t obvious at first.
Also, once you cross a few thousand sensors, performance tuning becomes necessary. It works well, but you need to understand how interval timing impacts database growth. That learning curve isn’t obvious at first.
What problems is the product solving and how is that benefiting you?
We had random WAN latency complaints from branch offices. Users blamed ISP, ISP blamed us. PRTG helped me correlate bandwidth usage, interface errors, and CPU spikes on the edge router at the exact complaint times.
Turns out nightly backup traffic was saturating the link. We rescheduled the backup window, and complaints dropped almost immediately.
Big benefit: It reduced finger-pointing between teams because we finally had time-stamped evidence.
Turns out nightly backup traffic was saturating the link. We rescheduled the backup window, and complaints dropped almost immediately.
Big benefit: It reduced finger-pointing between teams because we finally had time-stamped evidence.
Client-Friendly Monitoring with Flexible Dashboards, Probes, and Custom Sensors
What do you like best about the product?
It’s very client-friendly — we can create separate dashboards for each client without exposing internal data.
Remote probes are extremely useful for monitoring distributed client environments securely.
Custom sensors using PowerShell scripts allow us to extend monitoring beyond standard templates.
The notification escalation feature helps ensure no alert goes unnoticed.
Remote probes are extremely useful for monitoring distributed client environments securely.
Custom sensors using PowerShell scripts allow us to extend monitoring beyond standard templates.
The notification escalation feature helps ensure no alert goes unnoticed.
What do you dislike about the product?
Initial setup for multiple clients requires structured naming conventions; otherwise, it becomes messy quickly.
The reporting templates are good but require some customization to look polished for executive clients.
Resource usage increases if too many scanning intervals are set too aggressively.
The reporting templates are good but require some customization to look polished for executive clients.
Resource usage increases if too many scanning intervals are set too aggressively.
What problems is the product solving and how is that benefiting you?
One of our clients experienced intermittent VPN failures. Using PRTG monitoring, we traced the issue to ISP packet loss during peak hours.
We provided documented proof from PRTG reports to the ISP, which led to infrastructure correction.
This strengthened client trust because we had measurable data rather than assumptions.
We provided documented proof from PRTG reports to the ISP, which led to infrastructure correction.
This strengthened client trust because we had measurable data rather than assumptions.
All-in-One, Practical IT Monitoring with Flexible Sensors and Time-Saving Auto-Discovery
What do you like best about the product?
What I personally find most impressive about Paessler PRTG is how all-in-one and practical it is for real-world IT monitoring.
Everything in one monitoring platform
Sensor-based monitoring (very flexible)
Auto-discovery saves tons of time
Everything in one monitoring platform
Sensor-based monitoring (very flexible)
Auto-discovery saves tons of time
What do you dislike about the product?
Can get expensive as you scale
Resource-heavy and performance-sensitive
Scalability limits for very large enterprises
Resource-heavy and performance-sensitive
Scalability limits for very large enterprises
What problems is the product solving and how is that benefiting you?
Lack of visibility into IT systems
Unexpected downtime and performance issues
Slow or reactive IT management
Security risks and hidden threats
Unexpected downtime and performance issues
Slow or reactive IT management
Security risks and hidden threats
User-Friendly Real-Time Monitoring with Clear Dashboards and Instant Alerts
What do you like best about the product?
What I like best about Paessler PRTG is its user-friendly interface and real-time monitoring capabilities. It allows easy setup of sensors, provides clear dashboards, and sends instant alerts when issues occur. The centralized monitoring of network devices, servers, and applications helps quickly identify and resolve problems, improving overall system reliability and performance.
What do you dislike about the product?
What I dislike about Paessler PRTG is that it can become expensive as the number of sensors increases, especially for large-scale environments. The licensing model based on sensor count may limit scalability. Additionally, the initial configuration for complex infrastructures can feel overwhelming, and advanced customization options sometimes require deeper technical knowledge.
What problems is the product solving and how is that benefiting you?
PRTG addresses the challenge of limited network visibility and slow issue detection. It helps me by delivering real-time alerts, cutting down on downtime, and strengthening overall system reliability.
Stepping back, monitoring isn’t only about spotting problems after they appear; it’s about catching them early and preventing real business impact.
Stepping back, monitoring isn’t only about spotting problems after they appear; it’s about catching them early and preventing real business impact.
PRTG Auto-Discovery That Actually Works—Saves Hours on New VLANs
What do you like best about the product?
The "Auto-Discovery" that actually works. Most tools claim to do this, but PRTG is the only one I’ve used where I can point it at a new VLAN and it correctly identifies a Dell iDRAC versus a HP printer and assigns the right templates immediately. It saves me hours of manual sensor tagging when we refresh hardware.
What do you dislike about the product?
The lack of a "Global Undo" button. If you accidentally delete a probe or a complex group of sensors because your mouse slipped or you were tired, it’s gone. You better have a configuration backup ready, or you’re spending your afternoon rebuilding that hierarchy from scratch.
What problems is the product solving and how is that benefiting you?
Eliminated "Zombie Services." We had several legacy SQL instances that would "look" up but weren't accepting queries. By using the specific SQL v2 sensor, I caught a memory leak issue that our previous monitoring missed for months. It moved us from reactive "firefighting" to fixing things before the users even noticed the lag.
Fast Setup, Granular Monitoring, and Practical Alerting with PRTG Paessler
What do you like best about the product?
What I like most about PRTG Paessler is how quickly I was able to move from installation to actual visibility. In my previous tools, setup itself took weeks of tuning. With PRTG, I installed it in the morning and by afternoon I already had meaningful traffic graphs and device health metrics.
Another thing I genuinely appreciate is the sensor-based architecture. At first, I thought it was confusing, but once I understood it, I realized how flexible it is. I can monitor specific services on a server instead of just “server up or down.” That granular visibility helped me detect disk latency spikes that would have otherwise gone unnoticed.
The alerting logic is also practical. I like that I can set thresholds with delays (like alert only if CPU is above 90% for 10 minutes). That prevents alert fatigue, which is a real problem in IT teams.
The web interface is clean and not overloaded with unnecessary visual noise. Even junior team members were able to navigate it without much training.
Another thing I genuinely appreciate is the sensor-based architecture. At first, I thought it was confusing, but once I understood it, I realized how flexible it is. I can monitor specific services on a server instead of just “server up or down.” That granular visibility helped me detect disk latency spikes that would have otherwise gone unnoticed.
The alerting logic is also practical. I like that I can set thresholds with delays (like alert only if CPU is above 90% for 10 minutes). That prevents alert fatigue, which is a real problem in IT teams.
The web interface is clean and not overloaded with unnecessary visual noise. Even junior team members were able to navigate it without much training.
What do you dislike about the product?
One thing I didn’t initially like was how licensing is tied to sensors. When you start monitoring more services (especially with WMI sensors), the count grows very quickly. You need to plan sensor usage carefully or you’ll hit limits faster than expected.
The UI, while clean, can feel slightly outdated compared to some modern SaaS monitoring tools. It’s functional, but not “modern-looking.”
Another challenge I faced was with remote probes. While they are powerful, troubleshooting probe connectivity issues can take time if firewall rules are not perfectly configured.
The UI, while clean, can feel slightly outdated compared to some modern SaaS monitoring tools. It’s functional, but not “modern-looking.”
Another challenge I faced was with remote probes. While they are powerful, troubleshooting probe connectivity issues can take time if firewall rules are not perfectly configured.
What problems is the product solving and how is that benefiting you?
Before PRTG, we had multiple isolated monitoring tools — one for bandwidth, one for servers, one for uptime checks. That fragmentation caused delays in root cause analysis.
With PRTG, everything is centralized. For example, we had recurring application slowdowns. Developers blamed the database, the database team blamed the network. Using PRTG historical graphs, I correlated high network latency with specific backup windows. That data ended the blame cycle and we adjusted the backup schedule.
With PRTG, everything is centralized. For example, we had recurring application slowdowns. Developers blamed the database, the database team blamed the network. Using PRTG historical graphs, I correlated high network latency with specific backup windows. That data ended the blame cycle and we adjusted the backup schedule.
Reliable, Scalable Network Monitoring with Flexible Sensors and Easy Auto-Discovery
What do you like best about the product?
PRTG has been incredibly reliable for monitoring our network infrastructure. The custom sensors are flexible enough to track specific applications and devices that are critical to our environment. What stands out the most is the ease of setting up the system with auto-discovery — the initial configuration doesn’t feel like a headache, and it's scalable. The mobile app also gives me peace of mind; being able to monitor everything from my phone while on the go is a game changer.
What do you dislike about the product?
The major downside is the steep learning curve when you want to get into advanced configurations. Initially, the sheer number of features and dashboards can be overwhelming. Additionally, I find that the reports can be a bit clunky to customize compared to other tools. There could definitely be more intuitiveness in how the reports are laid out and shared. It took me some time to figure out how to properly export detailed reports without manually editing them.
What problems is the product solving and how is that benefiting you?
PRTG solved our main issue of keeping track of network health and ensuring that everything was performing optimally. Before PRTG, we were constantly running into performance issues without any real-time visibility into what was causing the slowdown. Now, with the custom thresholds and alerts, I can get notified of issues before they escalate. The benefits are huge in terms of reducing downtime and the time spent diagnosing network problems. Our response time to issues has decreased significantly, and troubleshooting is now much more straightforward.
Fast Setup, Strategic Monitoring, and Graphs That Back Up IT Budgets
What do you like best about the product?
I like how fast I could move from installation to actual monitoring. Within a few hours, I wasn’t just “setting it up” — I was already identifying weak spots in our switches.
The sensor-based licensing forced me to think strategically about what actually matters instead of monitoring everything blindly.
The historical graphs are surprisingly useful during internal meetings. I’ve literally used them to defend IT budget requests.
Remote probes saved us from deploying full monitoring servers in branch offices.
The sensor-based licensing forced me to think strategically about what actually matters instead of monitoring everything blindly.
The historical graphs are surprisingly useful during internal meetings. I’ve literally used them to defend IT budget requests.
Remote probes saved us from deploying full monitoring servers in branch offices.
What do you dislike about the product?
Sensor count management becomes stressful when you're close to the license limit. It makes you constantly evaluate what to disable.
The UI is functional but can feel dated in some sections.
Some advanced alerts require trial and error to avoid notification noise.
The UI is functional but can feel dated in some sections.
Some advanced alerts require trial and error to avoid notification noise.
What problems is the product solving and how is that benefiting you?
Before using it, we were reactive — users reported issues before IT knew.
After implementing it, we identified recurring bandwidth spikes every Monday morning tied to automated backups.
We reduced complaint tickets by about 40% because we started fixing things before users noticed.
Management now trusts IT data because we show actual metrics, not assumptions.
After implementing it, we identified recurring bandwidth spikes every Monday morning tied to automated backups.
We reduced complaint tickets by about 40% because we started fixing things before users noticed.
Management now trusts IT data because we show actual metrics, not assumptions.
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