Side by side

DU Meter vs OpenNMS

Both stand on network monitoring. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

DU Meter

Free trial Windows

DU Meter focuses on traffic visibility, threshold notifications, and an optional connectivity cutoff. Check the processor requirement and choose between the single-computer license and household Family Pack before buying.

Visit DU Meter

OpenNMS

Free plan APILinuxSelf-hosted+1

OpenNMS covers network monitoring across local and remote environments, with Horizon and Meridian serving different release and subscription needs. Consider Horizon’s production-readiness caveat and Meridian’s per-instance subscription limits when selecting a distribution.

Visit OpenNMS

The facts

	DU Meter	OpenNMS
Free plan	A free trial	Yes
Open source	Not published	Not published
Runs on	Windows	API, Linux, Self-hosted, Web
Lowest paid plan	Regular DU Meter license: $8.98, paid once	Basic: $6,000 a year
Plans published	2	6
Maker	Not published	Not published
Website	hageltech.com	opennms.com
On network monitoring	#41 of 55	#19 of 55

DU Meter: what it does well

Shows real-time download and upload graphs
Emails reports after weekly or monthly thresholds
Can block connectivity after an alert
Supports current listed Windows and Server editions
Includes technical support and minor upgrades

What to know first

No free plan
ARM processors are unsupported
Regular license covers one computer at a time
Family Pack is personal use only

OpenNMS: what it does well

Horizon community distribution is free
Monitors remote devices through Minions
Supports multiple traffic-flow formats
Grafana plugin displays alarms, outages, and KPIs

What to know first

Horizon features may not be production-ready
24/7 emergency support costs extra
Support plans exclude several third-party products
Meridian subscriptions are limited per instance

Alternatives to DU Meter Alternatives to OpenNMS The whole list