PRTG Network Monitor Freeware
Paessler GmbHExternal reviews
220 reviews
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External reviews are not included in the AWS star rating for the product.
PRTG Keeps Monitoring Focused on What Matters
What do you like best about the product?
What stood out for me is how PRTG lets you think in terms of “what matters” instead of just raw metrics. I didn’t have to monitor everything blindly—I could create sensors that actually reflect business impact (like whether our ERP is reachable or if WAN latency crosses a threshold during peak hours).
What do you dislike about the product?
The biggest frustration for me is that sensor planning becomes a hidden complexity over time. Initially it feels simple, but as your environment grows, you start hitting limits—not just licensing limits, but also mental overhead in managing hundreds of sensors logically.
What problems is the product solving and how is that benefiting you?
Before using PRTG, we had a reactive setup—users would report issues before we even knew something was wrong. After implementing it, the biggest benefit wasn’t just alerts—it was predictability.
Fast Network Visibility with Flexible, Customizable Sensors
What do you like best about the product?
What stood out to me is how quickly I could move from “no visibility” to actually understanding what’s happening in my network. The auto-discovery is decent, but what I really liked is the flexibility of sensors — especially when I started creating custom ones for specific services.
What do you dislike about the product?
Another thing is that the UI, while functional, can feel a bit dated when you’re working on it for long hours. Some deeper configurations (like dependencies and inheritance) are not very intuitive and took me some trial and error to fully understand.
What problems is the product solving and how is that benefiting you?
One specific benefit I saw was during a storage issue — PRTG showed a gradual increase in disk queue length over days, which helped us fix it before it became a full outage.
Overall, it reduced firefighting and gave us more confidence in system stability. Instead of guessing, we now rely on actual data trends to make decisions, which made a big difference in how we handle incidents.
Overall, it reduced firefighting and gave us more confidence in system stability. Instead of guessing, we now rely on actual data trends to make decisions, which made a big difference in how we handle incidents.
PRTG’s Smart Auto-Discovery and Sensor Suggestions Make Monitoring Easy
What do you like best about the product?
The way PRTG auto-discovers devices is genuinely helpful, but what stood out for me is how it suggests relevant sensors based on device type. For example, when I added a firewall, it didn’t just dump generic sensors—it actually recommended traffic, CPU, and session-based sensors that made sense.
The sensor-based licensing model initially felt confusing, but once I understood it, it gave me flexibility to monitor only what actually matters instead of entire bulky devices
The sensor-based licensing model initially felt confusing, but once I understood it, it gave me flexibility to monitor only what actually matters instead of entire bulky devices
What do you dislike about the product?
The initial setup can become messy if you don’t plan your sensor structure properly. I had to redo my device groups after a week because everything became cluttered.
The UI feels slightly outdated in some sections (especially the desktop console). The web interface is better, but still not very modern compared to newer tools.
The UI feels slightly outdated in some sections (especially the desktop console). The web interface is better, but still not very modern compared to newer tools.
What problems is the product solving and how is that benefiting you?
Before using PRTG, we had blind spots in network monitoring—especially with branch office devices. After implementation, I was able to detect intermittent WAN drops that users complained about but we couldn’t prove earlier.
It helped reduce downtime significantly because we now get alerts before users start reporting issues (like high CPU on core switches or storage nearing capacity).
It helped reduce downtime significantly because we now get alerts before users start reporting issues (like high CPU on core switches or storage nearing capacity).
User-Friendly, Powerful Real-Time Monitoring with Paessler PRTG
What do you like best about the product?
Paessler PRTG stands out thanks to its user-friendly interface and its powerful real-time monitoring capabilities.
What do you dislike about the product?
Paessler PRTG’s sensor-based licensing model can cause costs to rise quickly.
What problems is the product solving and how is that benefiting you?
Paessler PRTG helps address key network issues, such as undetected failures and bandwidth bottlenecks,
Auto-Discovery Delivers Accurate Network Maps Fast
What do you like best about the product?
The "Auto-Discovery" isn't just a gimmick. It actually maps out dependencies better than some expensive AI tools. I love that I can point it at a subnet, grab a coffee, and come back to a 90% complete network map with the correct OIDs already assigned to my Cisco gear
What do you dislike about the product?
The licensing model is based on "sensors," not devices. If you want to monitor 10 different metrics on a single core switch (CPU, RAM, and 8 high-traffic ports), that’s 10 sensors gone. It makes you feel like you have to "ration" your monitoring, which is a stressful way to manage a network
What problems is the product solving and how is that benefiting you?
It eliminated the "Is it the ISP or us?" argument. By setting up an external ping sensor alongside internal gateway monitoring, I can prove to management within 5 seconds where the packet loss is happening
Fast, Flexible Monitoring with Powerful Auto-Discovery and Alerting
What do you like best about the product?
What I like most about PRTG is how quickly I could get meaningful monitoring without spending weeks in configuration. The auto-discovery actually worked well in our environment, and the sensor-based approach made it easy to monitor very specific things (like one service on a VM instead of the entire server).The remote probes are very helpful for segregated networks. I also like that it doesn’t feel overly complicated compared to some enterprise monitoring tools.The alerting system is flexible — I configured escalation rules so night alerts go to only one on-call engineer instead of the entire team.
What do you dislike about the product?
The licensing model based on sensors can get confusing when your environment grows. In the beginning it felt affordable, but once we started monitoring more granular metrics, we hit the sensor limit faster than expected.Also, when monitoring across multiple remote sites, troubleshooting probe disconnections sometimes takes longer than it should.
What problems is the product solving and how is that benefiting you?
Before PRTG, we were mostly reactive — users told us when something was down. Now we get alerts before the helpdesk phone even rings. It helped us identify a bandwidth bottleneck caused by nightly backups overlapping with office hours.This allowed preventive maintenance instead of emergency shutdowns. Downtime incidents reduced noticeably, and production managers now trust IT more because we prevent problems instead of reacting to them.
Authentic, Experience-Based Reviews for PRTG Paessler
What do you like best about the product?
The absolute standout for me is how effortlessly I can spin up custom EXE sensors that pull live Modbus data straight from our legacy PLCs on the factory floor and correlate it with power draw on individual CNC machines. No other tool I’ve tried lets me do that without fighting through three layers of middleware or writing a full-blown agent. Last quarter I had one sensor flagging a 12% spike in vibration on a milling station at 2 a.m.—turned out to be a bearing starting to go. Fixed it during the next shift window instead of losing half a day of production.
What do you dislike about the product?
The hierarchical grouping for OT devices is still pretty manual. Every time maintenance swaps a sensor or adds a new actuator I have to go rebuild the tree structure by hand, and if you forget one sub-group the maps look like a jigsaw with missing pieces. It’s not a deal-breaker, but after a busy shutdown week it feels like busywork that should be smarter by now.
What problems is the product solving and how is that benefiting you?
We used to fly blind on predictive maintenance—machines would just fail and we’d scramble. Now PRTG gives us trending curves I can actually show the maintenance guys in plain English. We cut unplanned downtime by roughly 40 % on the critical lines and shaved about 18 % off our quarterly energy bill because we finally saw which machines were idling at full power overnight. The ROI showed up in the first six months.
Auto-Discovery That Actually Works—Deep Hardware Health via SNMP
What do you like best about the product?
When I drop a new core switch or a hypervisor onto the network, PRTG’s "Auto-discovery" finds about 90% of what I need (CPU, traffic, disk) without me having to manually look up OIDs or hunt for templates. It’s the "lazy man’s" dream that makes me look like I’m working much harder than I am.
What do you dislike about the product?
Paessler counts every single metric as a sensor. Want to monitor one switch? That’s not 1 license; that’s 20 (one for ping, one for CPU, one for every active port). You hit your license limit way faster than you’d expect, which forces you to be stingy about what you monitor.
What problems is the product solving and how is that benefiting you?
We used to have constant finger-pointing between the app devs and the net-ops team. By setting up a PRTG dashboard in the main office, I can prove in 5 seconds that the latency is at the database level, not the switch. It’s saved us countless hours of "ghost-chasing."
PRTG Easy to Implement and Use
What do you like best about the product?
We implemented Paessler PRTG in our production network to monitor our core and edge infrastructure, including Juniper MX routers, QFX switches, server infrastructure, and WAN circuits. We are using a mix of SNMP, NetFlow, and custom sensors to monitor interface utilization, BGP/OSPF status, CPU/memory, temperature, power supplies, and environmental sensors in our MDF/IDF locations.
Deployment was straightforward on a Windows Server VM, and adding devices via auto-discovery significantly reduced setup time. We’ve also built custom sensors for specific use cases, which has been very flexible. Updates have been smooth with no downtime issues, and the mobile app allows our team to receive alerts and acknowledge incidents while on call.
We did have one issue polling a Juniper MX router via SNMP due to configuration specifics, but Paessler support responded quickly, reviewed our logs, and helped us adjust the configuration so polling worked correctly. Overall, support has been responsive and knowledgeable.
Deployment was straightforward on a Windows Server VM, and adding devices via auto-discovery significantly reduced setup time. We’ve also built custom sensors for specific use cases, which has been very flexible. Updates have been smooth with no downtime issues, and the mobile app allows our team to receive alerts and acknowledge incidents while on call.
We did have one issue polling a Juniper MX router via SNMP due to configuration specifics, but Paessler support responded quickly, reviewed our logs, and helped us adjust the configuration so polling worked correctly. Overall, support has been responsive and knowledgeable.
What do you dislike about the product?
There are no major complaints. As our environment grows, sensor count management and licensing tiers require some planning to ensure we stay within limits. However, this is more of a scaling consideration than a product issue.
What problems is the product solving and how is that benefiting you?
PRTG provides centralized visibility into all aspects of our network infrastructure, including core routing, switching, WAN links, and critical services. Before implementing PRTG, troubleshooting often required logging into individual devices to diagnose issues. Now we receive proactive alerts for link degradation, device resource thresholds, and routing adjacency changes.
This has reduced mean time to detect (MTTD) and mean time to resolve (MTTR), improved uptime, and given management better reporting on bandwidth utilization and system health. It has become a key operational tool for maintaining network reliability and performance across our organization.
This has reduced mean time to detect (MTTD) and mean time to resolve (MTTR), improved uptime, and given management better reporting on bandwidth utilization and system health. It has become a key operational tool for maintaining network reliability and performance across our organization.
PRTG Delivers Fast, Script-Free Monitoring Visibility
What do you like best about the product?
What I genuinely like about PRTG is how fast it goes from zero to useful. Within a couple of hours of installation, we had visibility into our VMware hosts, core switches, Windows servers, and even SSL expiry monitoring without writing any custom scripts.
The auto-discovery feature is surprisingly practical. It’s not perfect, but it gives a solid starting baseline. Also, the sensor-based model makes you think in terms of "what exactly do I want to monitor?" rather than just adding machines blindly.
The auto-discovery feature is surprisingly practical. It’s not perfect, but it gives a solid starting baseline. Also, the sensor-based model makes you think in terms of "what exactly do I want to monitor?" rather than just adding machines blindly.
What do you dislike about the product?
Sensor licensing can get confusing as environments grow. You start small, but once you begin monitoring disk, CPU, services, processes, ports, and custom checks — sensors increase rapidly.
Also, advanced customization sometimes feels Windows-centric. If you're heavily Linux/cloud-native, you will rely more on SSH sensors and custom scripts.
Also, advanced customization sometimes feels Windows-centric. If you're heavily Linux/cloud-native, you will rely more on SSH sensors and custom scripts.
What problems is the product solving and how is that benefiting you?
We caught disk saturation issues before they caused outages.
We identified high CPU patterns during nightly batch jobs.
SSL certificate expiration alerts saved us twice from production outages.
We identified high CPU patterns during nightly batch jobs.
SSL certificate expiration alerts saved us twice from production outages.
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