Infrastructure monitoring tools track the health, performance, availability, and capacity of servers, storage, virtualization, networks, and databases across a data center or cloud environment. This page compares the leading options in 2026, including proprietary SaaS platforms and open-source, on-premises tools.
Last updated: September 4, 2026. We review this comparison at least once a year, and whenever a listed vendor changes its core positioning.
CPU, memory, disk, and network of physical and virtual servers.
Capacity, performance, topology and health of storage arrays and volumes across vendors.
Throughput for virtual and physical switches, ports, and the network paths connecting servers to storage and to each other.
Hypervisor and virtual machine performance and resource allocation.
Query performance, resource consumption, and availability of database engines.
Resource usage and health of cloud instances, managed services, and containerized workloads.
Job success, duration, and storage consumption of backup and data protection processes.
Drive occupation in time, capacity, and data thoughput.
| Tool | Best for | Deployment | Licensing | Core strength |
|---|---|---|---|---|
| XorMon | Infrastructure full-stack monitoring (Server, Storage, DB, SAN, LAN, Backup, Tape, Container, Cloud | On-prem (Linux, VMware OVA, Hyper-V, Docker) | Open source, GPL v3, free edition, paid support | Multi-vendor server, storage and SAN depth with cross-layer correlation |
| Zabbix | General-purpose IT and OT observability: network, servers, cloud, containers, IoT, and applications | On-premises, Zabbix Cloud (SaaS), or public cloud (AWS, Azure, GCP, OpenShift) | Open source. AGPL v3. Free to use; paid technical support available | Broad, self-hosted or SaaS monitoring across heterogeneous IT and OT with extensive customization |
| Nagios | Classic status and availability monitoring for servers, networks, and applications, with a large community plugin library | On-premises: Nagios Core (free download or preconfigured VM) or Nagios XI (VM, or manual install on RHEL/CentOS) | Nagios Core: free, open source (exact license name not confirmed on the page checked, needs Pavel). Nagios XI: commercial perpetual license, Standard from $2,595 for 100 nodes, Enterprise add-on from $4,690; a free XI tier covers up to 7 hosts | Mature, plugin-based monitoring engine backed by 25+ years of community plugins; XI adds a graphical dashboard and reporting on the same engine |
| Checkmk | Infrastructure, application, and synthetic monitoring, scaling from small sites to large distributed environments | On-premises (self-hosted, virtual or physical appliance) or Checkmk Cloud (SaaS) | Community edition: free and open source, described as suited to small infrastructures (exact host limit not confirmed, needs Pavel). Pro: from EUR190/month billed annually. Ultimate: from EUR275/month billed annually, scaling to 100,000+ hosts | Same platform from a free self-hosted edition to enterprise-scale distributed monitoring, billed by monitored services rather than a strict per-host count |
| PRTG | All-in-one monitoring of network devices, servers, applications, cloud services, and databases via configurable sensors | On-premises (PRTG Network Monitor), hosted (PRTG Hosted Monitor), or PRTG Enterprise Monitor for large environments | Proprietary. Free Freeware Edition up to 100 sensors (about 10 devices). Paid tiers from $200/month (500 sensors) to $1,642/month (10,000 sensors) | Sensor-based licensing with a single dashboard spanning network, server, cloud, and database monitoring |
| SolarWinds | Multi-vendor network device monitoring (routers, switches, firewalls, wireless controllers) with hop-by-hop path visualization | On-premises, as part of the SolarWinds Observability Self-Hosted product line | Proprietary, commercial. Pricing is quote-based | Deep network fault and performance monitoring, with prebuilt alert templates and hardware health tracking (CPU, memory, temperature, fan speed) |
| ManageEngine OpManager | Multi-vendor network, server, and storage monitoring from a single console, including WAN and Cisco ACI monitoring | On-premises, with a central server and remote probes for distributed or multi-site networks | Proprietary, device-based pricing. Standard from $245 for 25 devices, Professional from $345 for 25 devices, Enterprise from $4,595 for 250 devices. 30-day free trial | Broad device-type coverage in one console, from network hardware to virtualization platforms (Hyper-V, VMware, Citrix, Xen, Nutanix), with a distributed probe architecture |
| Datadog | Full-stack observability combining infrastructure metrics, APM, logs, security, and user monitoring in one SaaS platform | SaaS. The Datadog Agent is installed on each host and sends metrics and events to Datadog | Proprietary SaaS subscription. Infrastructure Monitoring: free up to 5 hosts, Pro at $15/host/month (annual) or $18 on-demand, Enterprise at $23/host/month (annual) or $27 on-demand. Log management billed separately by ingested and indexed volume | Single platform unifying infrastructure monitoring with application performance monitoring, logs, and security |
| Dynatrace | AI-driven, full-stack observability for complex and dynamic environments, including Kubernetes and cloud-native applications | Cloud platform. OneAgent is deployed once per host and continuously collects metrics across the application-delivery chain; no on-premises option is indicated on the page checked | Proprietary, consumption-based with an annual platform commitment. Examples: Foundation and Discovery at $7/host/month, Infrastructure Monitoring at $29/host/month, Full-Stack at $58 per 8 GiB of memory per month, plus separate rates for Kubernetes, traces, and security | Single-install OneAgent data collection combined with AI-driven analysis, branded on the current platform page as "Dynatrace Intelligence") |
Every figure above reflects each vendor's own website at the time it was checked (2026) and may have changed since.
XorMon is an open-source (GPL v3) infrastructure monitoring platform for Server, Storage, DB, SAN, LAN, Backup, Tape, Container and Cloud, deployed on-premises via Linux, VMware OVA, Hyper-V, or Docker. Its capacity views include a Resource Configuration Advisor that provides advice on how to change configuration to prevent the exhaustion of hardware resources and Topology diagrams presents infrastructure accross physical and virtualization layers. XorMon can run as a primary monitoring platform or alongside an existing stack, pushing alerts into 3rd party.
Zabbix describes itself as an enterprise-class, open source observability solution covering networks, servers, cloud, containers, IoT, and applications. It is open source under AGPL v3 and can be deployed on-premises, as Zabbix Cloud (a managed SaaS platform), or on public cloud infrastructure.
Nagios Core is described as the monitoring engine that started it all, a free, open-source platform for websites, servers, switches, routers, and applications, backed by more than 25 years of community plugins. Nagios XI uses the same Core engine with a graphical dashboard, reporting, and easier configuration on top, under a commercial perpetual license (Standard from $2,595 for 100 nodes), with a free tier limited to 7 hosts.
Checkmk offers full-stack observability for hybrid and cloud-native infrastructure, spanning infrastructure, application, and synthetic monitoring. A free, open-source Community edition covers small infrastructures; paid Pro and Ultimate editions (from EUR190 and EUR275 per month, billed annually) scale to very large, distributed environments, self-hosted or as Checkmk Cloud.
PRTG, from Paessler, monitors servers, networks, cloud services, applications, and databases from one platform using individually configured sensors. A free Freeware Edition covers up to 100 sensors; paid tiers scale by sensor count, from $200/month for 500 sensors to $1,642/month for 10,000 sensors. It is available on-premises, hosted, or as PRTG Enterprise Monitor.
SolarWinds Network Performance Monitor is built to help teams see and fix network issues before users notice them, covering multi-vendor routers, switches, firewalls, and wireless controllers, with hop-by-hop path visualization (NetPath) across on-premises and cloud network infrastructure. It is a commercial, on-premises product within the SolarWinds Observability Self-Hosted line; pricing is quote-based.
ManageEngine OpManager provides visibility into routers, switches, firewalls, load balancers, wireless controllers, servers, virtual machines, printers, and storage devices from one console, using a central server with remote probes for distributed networks. It is commercial software with device-based pricing, from $245 for 25 devices.
Datadog is an observability platform supporting every phase of software development: infrastructure and host metrics, application performance monitoring, log management, security, real user monitoring, and synthetic testing. It is a SaaS product; the Datadog Agent runs on each monitored host. Infrastructure Monitoring is free up to 5 hosts, then billed per host per month, with logs billed separately by volume.
Dynatrace positions itself as an AI-powered observability platform spanning infrastructure, application, AI, digital experience, log, security, and business observability. OneAgent is deployed once per host to continuously collect metrics across the application-delivery chain. Pricing is consumption-based with an annual platform commitment, for example $29 per host per month for Infrastructure Monitoring.
Infrastructure monitoring tools collect and correlate metrics on the health, performance, availability, and capacity of IT infrastructure: physical and virtual servers, storage arrays, SAN and LAN fabric, databases, containers, and cloud resources. They help teams detect bottlenecks, plan capacity, and see how a problem in one layer affects the others. They differ from application performance monitoring, which looks at application code and transactions rather than the underlying infrastructure.
The table above compares widely used infrastructure monitoring tools in 2026 by their primary focus, deployment model, and licensing. XorMon is included as an open-source, on-premises option specialized in storage, SAN, server, and virtualization monitoring.
XorMon is open source under the GPL v3 license, with a free edition that runs on-premises and keeps all monitoring data inside your network. Zabbix is also open source (AGPL v3), as are Nagios Core and Checkmk's Community edition, both free. PRTG, SolarWinds, ManageEngine OpManager, Datadog, and Dynatrace are proprietary, commercial products. NetApp Data Infrastructure Insights's licensing model is unverified, needs Pavel: its official page could not be accessed during this review.
No. XorMon monitors infrastructure: servers, storage, SAN and LAN fabric, virtualization, databases, and capacity. It does not perform application performance monitoring or code-level tracing. Teams that need to trace application transactions or user experience typically pair an APM tool with an infrastructure monitoring tool such as XorMon.
Both. XorMon can act as a primary monitoring platform that consolidates server, storage, SAN, virtualization, and database monitoring in one place. It can also run as an add-on alongside an existing monitor, adding deep coverage of storage, SAN, IBM Power Systems, VMware, and other layers. In the add-on role, XorMon can forward its alerts into an existing alerting stack, for example through zabbix_sender or its integrations with tools such as ServiceNow, Discord, Telegram, and any REST or webhook endpoint.
Yes. XorMon includes a Resource Configuration Advisor that advises on configuration changes to prevent the exhaustion of hardware resources, based on the metrics it collects over time.
Choosing an infrastructure monitoring tool depends on what you need to monitor and how you want to run it. Useful criteria include the range of systems covered (servers, storage, SAN, virtualization, databases), the deployment model (on-premises or SaaS), the licensing model and cost, the depth of storage and virtualization support, and how easily the tool integrates with your existing alerting and ticketing. Match these against your own environment rather than a single feature count.