Best network monitoring tools in 2026
Devices, links, latency and traffic: SNMP polling, flow analysis and path monitoring. This list has the top 11 of 29 network monitoring tools, ranked by a published score. Of these, 6 are open source, 9 have a free plan and 11 can be self-hosted. Checked by hand on 30 September 2026.
How this list is ranked
Each active tool gets a score out of 100. Archived, end-of-sale and maintenance-only tools are left out.
- Capabilities: up to 75 points for the share of the category checklist that the tool's own documentation confirms. A tool meeting 8 of 10 items gets 60.
- Free to start: 15 points for a free plan or a free edition.
- Open or self-hostable: 10 points if it is open source or can be self-hosted.
Each category has a fixed checklist of capabilities (shown in the table below and on every tool page). An item counts only when the tool's own documentation confirms it; anything we could not confirm counts as not met. How long a tool has existed is deliberately not scored, so a new tool is not ranked below an older one for being new. Tools with the same score share a rank (shown as =), are listed A to Z within it, and the list never cuts between them. Nobody pays for a position.
- =1
LibreNMS
Network monitoring system with automatic SNMP discovery, graphs and alerting, supporting a long list of network hardware vendors.
100 10 of 10 capabilities (75), free 15, open 10 - =1
ManageEngine OpManager
On-premises network and server monitoring for routers, switches, firewalls, Windows and Linux hosts and virtual machines.
100 10 of 10 capabilities (75), free 15, open 10 - =3
Observium
Network monitoring platform with SNMP auto-discovery of devices; a free Community Edition and a paid Professional edition with faster updates.
93 9 of 10 capabilities (68), free 15, open 10 - =3
PRTG Network Monitor
Windows-based network and server monitoring from Paessler built around sensors for SNMP, WMI, flows, ping and HTTP, with maps and dashboards.
93 9 of 10 capabilities (68), free 15, open 10 - =5
Cacti
Network graphing tool built on RRDtool: polls devices over SNMP or scripts and draws long-term graphs of traffic and system metrics.
85 8 of 10 capabilities (60), free 15, open 10 - =5
OpenNMS
Network management platform for fault and performance monitoring at scale; Horizon is the open source edition and Meridian the supported one.
85 8 of 10 capabilities (60), free 15, open 10 - =5
SolarWinds
Suite of network, server, database and application monitoring products, sold as self-hosted software and as the SaaS SolarWinds Observability.
85 10 of 10 capabilities (75), free 0, open 10 - =5
WhatsUp Gold
Progress network monitoring for devices, servers and applications, with layer 2/3 discovery and interactive network maps.
85 10 of 10 capabilities (75), free 0, open 10 - =9
Checkmk
Infrastructure monitoring for servers, networks, cloud and containers with automatic service discovery; the base edition is open source and paid editions add more.
78 7 of 10 capabilities (53), free 15, open 10 - =9
ntopng
Web-based network traffic monitor that analyses packets or flows to show top talkers, applications, hosts and alerts. Open source Community edition with paid Pro and Enterprise versions.
78 7 of 10 capabilities (53), free 15, open 10 - =9
Zabbix
Open source monitoring for networks, servers, VMs, applications and cloud, using agents, SNMP and templates with trigger-based alerting; Zabbix Cloud is the hosted option.
78 7 of 10 capabilities (53), free 15, open 10
Side by side
| Tool | Pricing | Free plan | Open source | Self-hosted | SNMP polling | Flow analysis | Device discovery | Topology maps | Latency and path | Bandwidth graphs | Syslog and traps | Configuration backup | Alerting | Wireless |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LibreNMS | Free | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| ManageEngine OpManager | Free plan | Free edition: 3 devices | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Observium | Free plan | Yes | No | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| PRTG Network Monitor | Free plan | Freeware edition: 100 sensors | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | - | Yes | Yes |
| Cacti | Free | Yes | Yes | Yes | Yes | Yes | Yes | Yes | - | Yes | Yes | Yes | Yes | - |
| OpenNMS | Free plan | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | - | Yes | - |
| SolarWinds | Paid | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| WhatsUp Gold | Paid | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Checkmk | Free plan | Yes | Yes | Yes | Yes | - | Yes | Yes | - | Yes | Yes | - | Yes | Yes |
| ntopng | Free plan | Yes | Yes | Yes | Yes | Yes | Yes | - | Yes | Yes | Yes | - | Yes | - |
| Zabbix | Free plan | Yes | Yes | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes | - | Yes | - |
Yes: confirmed in the tool's documentation. No: documented as not offered. -: not confirmed. Plans and prices change; check each tool's own site before you decide.
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- Open source network monitoring tools in 2026 13
- Network monitoring tools with a free plan in 2026 18
- Self-hosted network monitoring tools in 2026 23
- Best monitoring tools in 2026 28
- Best uptime monitoring tools in 2026 10
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- Best server monitoring tools in 2026 14
- Best database monitoring tools in 2026 12
- Best Kubernetes monitoring tools in 2026 14
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