Server Monitoring Tools: 9 Platforms Compared on Metrics, Alerting and Pricing Model

A server monitor collects metrics at a fixed interval, compares them with thresholds and raises alerts through email, SMS or webhooks. It also stores history so you can plan capacity. Without it, teams learn about a full disk or a stalled service from an angry ticket.

Monitoring is also a control, not just a convenience. NIST describes the practice in NIST SP 800-137 on information security continuous monitoring, and most device data arrives through SNMP, defined in IETF RFC 3411. Alerts should feed your ITSM or help desk so incidents become tracked tickets.

The tools below come from SaaSPodium's network monitoring software category. Several started life as network monitors and now cover servers, which is common in this market. Listings do not yet carry user ratings, so we ordered the tools by breadth of server and infrastructure coverage. Prices are SaaSPodium's listed starting figures as of November 2026 where available; many vendors quote by sensor, device or node.

What Server Monitoring Tools Should Track

A good monitor tracks availability, CPU, memory, disk, network throughput, running services and hardware health, and keeps history for trend analysis. Coverage of processes and logs matters as much as raw metrics.

Metrics and protocols

• Resource metrics: CPU load, memory pressure, disk capacity and I/O, temperature and RAID state where exposed.
• Protocols: SNMP, WMI, ICMP ping and agents; agentless collection is faster to deploy, agents give deeper data.
• Alerting: thresholds, dependencies to suppress alert storms, and escalation chains.
• Reporting: capacity trends, availability and SLA reports.

Availability formula

Report uptime consistently so teams compare like with like:

Uptime and downtime are measured over the same period, for example one month; 99.9% availability allows about 43 minutes of downtime in a 30-day month.

1. Nagios XI

Nagios XI is an enterprise monitoring product with a SaaSPodium starting price of $1,995, built on the long-running Nagios core. It suits teams that want deep customization through plugins and have the skills to tune it.

• Architecture: server-based engine with a plugin ecosystem; see Nagios XI.
• Integrations: plugin and add-on model covers many devices and applications.
• Pricing model: paid license; verify tiers with the vendor.

2. Zabbix

Zabbix is an open-source monitoring platform listed as free on SaaSPodium. It fits organizations willing to self-host, tune templates and operate the platform themselves in exchange for no license fee.

• Architecture: self-hosted server with agents, SNMP and proxy collection; see Zabbix.
• Integrations: templates and APIs for common systems.
• Pricing model: free software; the vendor sells support and services separately.

3. Paessler PRTG

PRTG Network Monitor is a freemium, sensor-based monitoring product that covers network, server and application checks from one console. It suits small and mid-size IT teams that want fast setup.

• Architecture: on-premises core server with probes; see PRTG Network Monitor.
• Integrations: SNMP, WMI, flow and API-based sensors.
• Pricing model: licensed by sensor count; check the free tier limit on the vendor site.

4. ManageEngine OpManager

ManageEngine OpManager offers unified network and infrastructure monitoring and appears on SaaSPodium as freemium. It fits teams that want servers, switches and virtual hosts in one view.

• Architecture: self-installed server with discovery and templates; see ManageEngine OpManager and our OpManager review.
• Integrations: SNMP, WMI and flow-based sources.
• Pricing model: free edition plus paid editions; request a quote.

5. Progress WhatsUp Gold

WhatsUp Gold from Progress is a freemium monitoring product described as seeing everything connected to your network. It suits mixed on-premises and cloud environments that need maps and alerts together.

• Architecture: server software with discovery and topology maps; see Progress WhatsUp Gold.
• Integrations: monitors servers, applications and network devices.
• Pricing model: tiered licensing; confirm current editions.

6. LogicMonitor

LogicMonitor is a cloud-based platform for monitoring hybrid infrastructure. It suits teams that prefer a SaaS-delivered monitor with collectors rather than hosting the monitoring server themselves.

• Architecture: SaaS portal with lightweight collectors; see LogicMonitor.
• Integrations: broad coverage across data center and cloud resources.
• Pricing model: quote-based, usually by resource count.

7. SolarWinds Network Performance Monitor

SolarWinds NPM is listed from $1,700 on SaaSPodium and focuses on network fault and performance. Use it beside a server-oriented product when your priority is switches, routers and links rather than host internals.

• Architecture: on-premises platform; see SolarWinds NPM.
• Integrations: part of a wider SolarWinds product family.
• Pricing model: paid license; check module and node counts.

8. Auvik

Auvik positions itself as network management made simple, with automated discovery and mapping. It is a fit for IT teams and service providers who want network visibility more than deep server metrics.

• Architecture: cloud-delivered with on-site collectors; see Auvik.
• Integrations: check the current catalog for PSA and ticketing connectors.
• Pricing model: quote-based.

9. Datadog Network Monitoring

Datadog Network Monitoring unifies cloud and on-premises network visibility inside the broader Datadog observability platform. It suits teams already using Datadog for application and infrastructure telemetry.

• Architecture: SaaS platform with host agents; see Datadog Network Monitoring.
• Integrations: ties into Datadog's wider monitoring products.
• Pricing model: usage-based with a freemium entry; model costs at your scale.

How to Choose a Server Monitor

Choose by environment and skills. Self-hosting teams can use open-source or on-premises tools, lean teams prefer SaaS or sensor-based products, and large enterprises should test scale, role-based access and integrations before committing.

• Count servers, devices and services to estimate sensors or licenses.
• Decide agentless versus agent-based collection for each OS.
• Test alert routing into your help desk, chat and on-call tools.
• Pilot with ten real servers and tune thresholds for two weeks.

For adjacent reading, see our guides to system monitoring software and Linux monitoring software, and compare vendors at Zabbix if you want an open-source baseline.

Frequently Asked Questions

What is the best free server monitoring tool?
Zabbix is listed as free on SaaSPodium, and PRTG and OpManager have free tiers or editions with limits. Free options trade license cost for setup time, so budget for administration effort.

Agent-based or agentless server monitoring?
Agentless monitoring uses SNMP or WMI and deploys quickly. Agents add deeper process and log data and work better across firewalls, but require installation and updates on every server.

How much does server monitoring cost?
SaaSPodium lists starting prices of $1,700 and $1,995 for two paid products as of November 2026, while others are free or quote-based. Many vendors price by sensor, node or resource, so model your server count first.