LibreNMS is for teams with Linux skills that want free, self-hosted monitoring with basic topology visualization. Observium is for teams that want autodiscovering SNMP monitoring across mixed vendors and can treat mapping as a per-device view. The table below sets them side by side on the protocols each uses to discover a network, the topology views each produces, licensing, and pricing.
LibreNMS and Observium compared
Discovery protocols, the topology views each tool produces, service detection, pricing and licensing. Scanopy is in the table as a third option, and it is our product.
| ToolProduct name and link to vendor site | DiscoveryProtocols used to find devices and map connections | Network ViewsWhich topology views the tool produces from discovery. L2 Physical switch ports and links L3 Subnets, VLANs, routing Workload VM/container host nesting Application Service-dependency / app grouping Yes supported Tag ? unverified Greyed not supported | ServicesNo No service awareness Basic Common port detection Yes Application-level fingerprinting | PricingStarting price or pricing model | Open SourceOSI OSI-approved open source license Source available Source code available, restricted license No Proprietary |
|---|---|---|---|---|---|
| LibreNMS | SNMP CDP LLDP [10] | No | Free | OSI GPL-3.0 | |
| Observium | SNMP CDP LLDP [50] | No | Free (Community); Professional subscription [51] | OSI QPL | |
| Scanopy | SNMP LLDP CDP ARP ICMP mDNS TCP/UDP | Yes260+ types | Starts at $79.99 monthly, unlimited hosts | OSI AGPL-3.0 |
Scanopy is our product. Vendor details are sourced from official documentation, published pricing, and community reports as of June 2026. Features, pricing, and capabilities may have changed since publication. Check each vendor's website for the latest information.
Where each fits
LibreNMS. Teams with Linux server management skills that want free monitoring with some topology visualization. If you're already running LibreNMS for monitoring, the weathermap plugin adds basic mapping without another tool.
Observium. Teams already committed to SNMP polling across a mixed-vendor estate who want device health, interface graphs, and neighbour data in one place, with Linux administration in-house.
Head-to-head against Scanopy: Scanopy vs LibreNMS and Scanopy vs Observium. Looking more broadly: LibreNMS alternatives,Observium alternatives. For every tool side by side, see the full network diagram tools comparison.
Sources
Started as a homelabber, now deep in SNMP MIBs, Layer 3 topology, and service fingerprinting - building the network documentation tool I wished existed.