PRTG Network Monitor is an all-in-one monitoring platform for networks, servers, applications, and cloud services, licensed by the number of sensors monitored. Teams look for a PRTG alternative when that per-sensor cost grows faster than their environment, often once server, storage, SAN, and virtualization monitoring adds large numbers of sensors on top of the network devices PRTG was chosen for.
XorMon does not replace PRTG. PRTG's core strength is general-purpose network device monitoring: routers, switches, wireless controllers, and other network hardware via SNMP, across an entire network. XorMon's own network coverage is narrow: Cisco LAN and SAN switches only. Where the two overlap is server, storage, SAN, and virtualization monitoring. If that layer is driving up a PRTG sensor count and bill, it can move to XorMon, either alongside PRTG or in place of it for that layer alone, while PRTG keeps handling general network monitoring.
Last updated: September 26, 2026. We review this comparison at least once a year, and whenever PRTG or XorMon changes its pricing or core positioning.
| Outil | Usage privilégié | Déploiement | Modèle tarifaire |
|---|---|---|---|
| XorMon | Server, storage, SAN, and virtualization monitoring without per-sensor licensing | Sur site (Linux, VMware OVA, Hyper-V, Docker) | Free, self-hosted GPL v3 edition. Optional paid commercial support. No per-sensor fee, no per-device count, and no monitoring data leaves your network |
| Zabbix | Observabilité IT et OT généraliste : réseau, serveurs, cloud, conteneurs, IoT et applications | Sur site, Zabbix Cloud (SaaS) ou cloud public (AWS, Azure, GCP, OpenShift) | Gratuit et open source. AGPL v3 à partir de la version 7.0, GPL v2 pour les versions antérieures. Aucun frais de licence ; support technique payant en option |
| Checkmk | Supervision de l’infrastructure, des applications et supervision synthétique, du petit site aux grands environnements distribués | Sur site (auto-hébergé, appliance virtuelle ou physique) ou Checkmk Cloud (SaaS) | Édition communautaire : gratuite et open source, jusqu’à environ 100 hôtes. Pro : à partir de 190 EUR/mois en facturation annuelle. Ultimate : à partir de 275 EUR/mois en facturation annuelle, jusqu’à plus de 100 000 hôtes |
| LibreNMS | Automated network discovery and monitoring via SNMP, CDP, LLDP, OSPF, and BGP, with bandwidth and port-level traffic tracking | Self-hosted (Ubuntu or CentOS, with Apache or Nginx, or via Docker) | Free and open source (GPL v3). No sensor count, no per-device fee, and no official paid tier; community support |
PRTG Network Monitor is an all-in-one platform for network devices, servers, applications, cloud services, and databases, using SNMP, NetFlow, Wi-Fi, and other protocols. It is billed by the number of sensors monitored; as a reference point, the vendor's free tier covers up to 100 sensors for about 10 devices.
PRTG's Freeware Edition is limited to 100 sensors, about 10 devices, and paid tiers then scale from $200 per month for 500 sensors to $1,642 per month for 10,000 sensors (rates published on paessler.com/prtg/pricing, checked September 26, 2026). Teams look for a PRTG alternative when this per-sensor cost grows faster than their environment, particularly once server, storage, SAN, and virtualization monitoring is layered on top of the network devices PRTG already covers.
The table above compares infrastructure monitoring alternatives to PRTG by best fit, deployment, and pricing model, including XorMon.
XorMon moves server, storage, SAN, and virtualization monitoring off a per-sensor licensing model onto a self-hosted, open-source platform: a free GPL v3 edition with no sensor count and no per-device fee, plus optional paid commercial support. Monitoring data stays inside your network rather than being counted and billed sensor by sensor.
No. PRTG's core strength, general-purpose network device monitoring via SNMP across an entire network, has no equivalent in XorMon: XorMon's own network coverage is limited to Cisco LAN and SAN switches. XorMon covers servers, storage, SAN, and virtualization. Teams typically keep PRTG, or a dedicated network monitoring tool, for the wider network, and move server, storage, SAN, and virtualization monitoring to XorMon where cost is the deciding factor.
Yes. XorMon can run alongside PRTG, handling server, storage, SAN, and virtualization monitoring on-premises while PRTG continues to cover general network device monitoring. This reduces the number of sensors PRTG needs to license for that layer without giving up network-wide visibility.
Yes. XorMon has a self-hosted edition released under the GPL v3 license, with optional paid commercial support. All monitoring data stays inside your network; none of it is sent to a third-party service.