PRTG Network Monitor
Sensor-based network and infrastructure monitoring from Paessler.
Freemium Cloud + desktop
- Platforms
- Windows server + web/mobile; also SaaS (Hosted Monitor)
- Licence
- Freemium — free up to 100 sensors
- Price
- Free up to 100 sensors; paid from ~$1,750/yr (PRTG 500)
- Category
- Monitoring & observability
- Updated
- 2026-11-05
What it is
PRTG is a commercial monitoring tool organised around "sensors": the availability and load of servers, links, SNMP devices and traffic. One console gives you maps, dashboards and alerting, and a hosted SaaS edition sits alongside the on-prem Windows server.
Problems it removes
- You want packaged monitoring on Windows without assembling open-source parts.
- Management wants clean dashboards and maps out of the box.
How administrators use it
- Auto-discover a subnet and let PRTG build sensors per device.
- Assemble maps and dashboards for the NOC and route alerts by channel.
Strengths & trade-offs
Strengths
- Quick to deploy.
- Polished dashboards and maps.
- Free tier up to 100 sensors.
Trade-offs
- Sensor-based pricing climbs with scale.
- The on-prem server is Windows-bound.
Common questions
How many sensors are free?
Up to 100 sensors are free; beyond that you buy a licensed tier.
Is there a cloud version?
Yes — PRTG Hosted Monitor is a SaaS edition alongside the on-prem Windows server.