PRTG is one of those tools that gets installed once and lives forever. IT teams at SMBs and enterprises have been running it for years — it sits on a Windows server somewhere, it watches the network, and it alerts when something goes wrong internally. It's battle-tested, genuinely capable, and designed for a specific job: monitoring your internal infrastructure from the inside.
Vigilmon is designed for a different job entirely: monitoring your public-facing services from the outside, the way your actual users experience them.
This comparison is honest about where each tool belongs. They're not competitors in the way that two HTTP uptime checkers are. They serve different teams, different environments, and different problems.
What PRTG Is
PRTG Network Monitor is an on-premise infrastructure monitoring platform developed by Paessler AG. It has been in active development since 1997 and is used by thousands of IT departments for internal network and system visibility.
PRTG's core capabilities include:
- SNMP Monitoring: Query network devices (routers, switches, firewalls, printers) using Simple Network Management Protocol to track bandwidth, CPU load, interface status, and error rates
- WMI Monitoring: Reach into Windows servers via Windows Management Instrumentation to track CPU, memory, disk, process health, and Windows event logs
- NetFlow / sFlow / IPFIX: Capture and analyze network traffic flow data to understand bandwidth usage patterns, top talkers, and protocol distribution
- Ping and Packet Loss Monitoring: Measure latency and packet loss between internal network nodes
- VMware and Hyper-V Monitoring: Visibility into virtualization hosts and guest VMs without agents
- Database Sensor: Query SQL databases (MSSQL, MySQL, PostgreSQL, Oracle) for custom metrics
- SNMP Trap Receiver: Catch network device alerts without polling
- Custom Scripts: Execute PowerShell or Python sensors for anything not covered by native sensors
PRTG installs on a Windows Server in your environment. Sensors — each unit of monitoring — are the billing unit. You buy a license for a number of sensors (e.g., 500, 1000, 2500, or unlimited), install the probe on your network, and it monitors everything it can reach from inside your infrastructure.
The important word there is inside. PRTG probes run within your network. They can see your internal servers, switches, printers, and VMs. They cannot independently verify whether your public website is reachable by a user in Tokyo.
What Vigilmon Is
Vigilmon is a cloud-based external uptime monitoring platform. It watches your HTTP endpoints, TCP ports, and SSL certificates from multiple geographic regions simultaneously, and alerts via Slack, email, or webhook when something fails.
The architectural difference that matters most: Vigilmon's probes run in the cloud, outside your infrastructure, simulating the experience of a real user hitting your service over the public internet. This means it catches failures that PRTG never sees — CDN misconfigurations, DNS propagation failures, SSL certificate expiries, regional routing issues, and third-party API dependencies that are invisible from inside your own network.
Vigilmon also uses multi-region consensus alerting: before firing an alert, it requires a quorum of probes from different geographic regions to confirm the failure. A single probe losing connectivity to your server doesn't page your team. Only confirmed, multi-region failures trigger alerts.
Every Vigilmon plan includes a public status page that updates automatically when monitors detect downtime or recovery — no manual process during incidents.
Setup is intentionally minimal: create an account, add a URL, and your first monitor is running in under two minutes. No Windows server required. No sensor license to size.
The Core Distinction: Internal vs. External Visibility
This is the defining difference:
PRTG asks: "Is this router interface up? Is this Windows server using more than 90% RAM? Is this database server responding to my internal ping?"
Vigilmon asks: "Can a user in São Paulo reach this endpoint right now? Is this API returning a 200? Is this SSL certificate expiring in 14 days?"
These questions are not in competition — they're complementary. PRTG tells you the health of your internal infrastructure. Vigilmon tells you whether your users are experiencing that infrastructure correctly. A server can be running fine by every PRTG metric while users are getting 502 errors because of a load balancer misconfiguration. Vigilmon catches that. PRTG doesn't.
Similarly, PRTG can't monitor third-party services your application depends on — payment processors, auth providers, CDNs, email delivery APIs — unless those services are inside your network boundary. Vigilmon can monitor any URL or TCP port, anywhere.
Feature Comparison
| Feature | Vigilmon | PRTG | |---|---|---| | HTTP/HTTPS uptime monitoring | Yes | Yes (via HTTP sensor) | | External monitoring (cloud probes) | Yes — multiple regions | No — probes are on-premise | | TCP port monitoring | Yes | Yes | | SSL certificate monitoring | Yes | Yes (via SSL sensor) | | Multi-region consensus alerting | Yes | No | | SNMP / network device monitoring | No | Yes — core strength | | WMI / Windows server monitoring | No | Yes | | NetFlow / bandwidth analysis | No | Yes | | VMware / VM monitoring | No | Yes | | Internal network visibility | No | Yes | | Status page (public) | Yes, included | No | | On-premise deployment | Open-source self-host option | Yes — required | | Cloud SaaS option | Yes | PRTG Hosted Monitor (extra cost) | | Setup time | Minutes | Hours to days | | Licensing model | Per monitor / subscription | Per sensor count | | Pricing | From ~$10–20/month | From ~$1,750/year (500 sensors) |
Pricing Reality
PRTG
PRTG is licensed by sensor count and sold as an annual license:
| License | Sensors | Annual Price (approx.) | |---|---|---| | Freeware | 100 | $0 | | 500 sensors | 500 | ~$1,750/year | | 1000 sensors | 1000 | ~$3,200/year | | XL1 | 2500 | ~$6,500/year | | Unlimited | Unlimited | ~$13,000+/year |
These are perpetual license + maintenance costs, billed annually. PRTG also offers a cloud-hosted version (PRTG Hosted Monitor) with per-month subscription pricing, but the on-premise edition remains the standard.
There's also a real hidden cost: PRTG requires a dedicated Windows Server to run on. Factor in the infrastructure cost, Windows license, and the IT time needed to administer it.
Vigilmon
Vigilmon's pricing is straightforward:
- Free tier: 5 monitors, 1-minute check intervals, status page included
- Paid plans: Starting from approximately $10–20/month for independent developers and small teams
- No per-sensor licensing, no Windows server requirement, no infrastructure to maintain
For a team running 20 public-facing endpoints, Vigilmon's total cost is a fraction of PRTG's — and requires no server to run it on.
Who Should Use What
Use PRTG when:
- Your team is IT-focused and manages on-premise infrastructure (routers, switches, Windows servers, printers, VMs)
- You need SNMP monitoring for network devices that don't expose HTTP endpoints
- You need internal network visibility (bandwidth analysis, interface errors, internal latency)
- Your environment is primarily internal and not publicly exposed to the internet
- You have a Windows Server environment and an IT admin who will own the PRTG instance
Use Vigilmon when:
- You're a developer or engineering team monitoring public-facing web services, APIs, or SaaS products
- You need external monitoring — checks that simulate real user traffic over the public internet
- You need multi-region redundancy to distinguish real outages from transient probe failures
- You want a public status page included without extra configuration
- You need fast setup without infrastructure overhead
Use both when:
- Your organization has both internal network infrastructure (handled by PRTG) and external web services (handled by Vigilmon)
- You want complete coverage: PRTG for internal health, Vigilmon for external user experience
Practical Example
Suppose you run a web application hosted on AWS. Inside your network (or within your AWS VPC), PRTG would tell you:
- Is the EC2 instance's CPU under 80%?
- Is the RDS database instance responding to internal queries?
- Is the load balancer receiving traffic?
But Vigilmon would tell you:
- Is
https://yourapp.com/api/healthreturning 200 from users in the US, EU, and Asia-Pacific? - Is your SSL certificate expiring soon?
- Is the
/checkoutendpoint responding within 2 seconds? - Is your outbound email delivery API (Postmark, SendGrid) reachable?
A disk failure on your application server would show up in PRTG before it showed up in Vigilmon. But a CloudFront misconfiguration that routes users to a dead origin would show up in Vigilmon immediately while PRTG's internal metrics show nothing unusual.
Migration or Complement?
PRTG users who are also running web services don't need to replace PRTG — they need to add external monitoring alongside it. The two tools complement each other rather than compete.
If your organization is evaluating monitoring tools for the first time and your environment is a publicly-hosted web application rather than an on-premise network, Vigilmon is the right starting point. PRTG's licensing overhead and infrastructure requirements make it a poor fit for cloud-native teams who simply need to know when their endpoints are down.
Bottom Line
PRTG and Vigilmon are not alternatives to each other — they're tools for different monitoring jobs.
PRTG is the right choice for IT teams who manage internal network infrastructure and need SNMP, WMI, and NetFlow visibility. It's proven, deeply capable, and worth the complexity and cost in the environments it was designed for.
Vigilmon is the right choice for developer teams who need to know their public-facing services are reachable, performant, and trustworthy from the user's perspective. It's faster to set up, significantly cheaper for web monitoring use cases, and designed for the external visibility that PRTG architecturally can't provide.
Get started with Vigilmon free — no Windows server required.