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Networking · head to head

LibreNMS vs OPNsense

LibreNMS logo

LibreNMS

Networking

Free, community-driven network monitoring with commercial support sold by a third-party partner, not the project itself

From
Free
Rated
-
Full reviewWebsite
OPNsense logo

OPNsense

Networking

FreeBSD-based firewall and routing platform with weekly updates and a full configuration API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: LibreNMS there is no official LibreNMS company; commercial support runs through a single designated third-party partner, Config Services Ltd, rather than a broad vendor support market; OPNsense throughput depends entirely on hardware you selected yourself, and intrusion prevention at multi-gigabit rates will saturate a machine that handled plain firewalling fine, with no vendor sizing commitment to fall back on.
  • They diverge on capability: LibreNMS covers SNMP auto-discovery, OPNsense covers Stateful firewall on pf.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which LibreNMS and OPNsense actually diverge.

Attributes where LibreNMS and OPNsense differ
AttributeLibreNMSOPNsense
Pricing modelOpen source, no licence fee; commercial support sold by a third-party partnerOpen source, no licence fee
PlatformsLinux, Webx86-64 appliances, Virtual machines, Deciso hardware

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Networking).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in LibreNMS

  • SNMP auto-discovery
  • Device and OS support
  • Alerting
  • API
  • Distributed polling

Only in OPNsense

  • Stateful firewall on pf
  • VPN suite
  • Suricata IDS and IPS
  • Full configuration API
  • High availability
  • Weekly update cadence

What people use each for

The jobs each tool is most often brought in to do.

LibreNMS

  • A network team wanting SNMP-based device monitoring with zero licence cost and full control over the deploymentnot OPNsense
  • An organisation with in-house Linux and networking expertise that does not need a vendor support contractnot OPNsense
  • A team wanting an alternative to Icinga that is focused specifically on network device polling rather than general infrastructure monitoringnot OPNsense
  • A company wanting SLA-backed support for LibreNMS but without wanting to build that capability in-house, contracting the designated partner insteadnot OPNsense

OPNsense

  • Replacing a small business firewall appliance whose renewal quote exceeded the cost of the hardwarenot LibreNMS
  • Branch offices where the firewall configuration must be produced by Ansible rather than by handnot LibreNMS
  • Sites that need WireGuard and intrusion prevention on the same box without separate feature licencesnot LibreNMS
  • A homelab or lab network needing VLAN routing, multi-WAN and DNS filtering on one machinenot LibreNMS

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

LibreNMS

  • There is no official LibreNMS company; commercial support runs through a single designated third-party partner, Config Services Ltd, rather than a broad vendor support market
  • Self-hosting and maintaining LibreNMS requires real Linux and SNMP expertise, and there is no vendor obligated to fix issues without a separate paid support arrangement
  • Device and OS support quality varies because it is community-contributed, so obscure or newer hardware may have thinner or less accurate polling templates than mainstream vendors
  • The web interface, while functional, is less polished out of the box than commercial tools like PRTG, and dashboard customisation takes more manual configuration
  • Scaling to a very large device count requires manually configuring distributed polling, which is more operational work than a SaaS tool that scales transparently
  • Project direction depends on community and contributor priorities rather than a company roadmap, so feature development pace and priorities can be less predictable than a commercial vendor's

OPNsense

  • Throughput depends entirely on hardware you selected yourself, and intrusion prevention at multi-gigabit rates will saturate a machine that handled plain firewalling fine, with no vendor sizing commitment to fall back on.
  • The weekly update cadence is good for security but means more change events than a team used to annual appliance firmware, and occasional regressions reach production installations.
  • FreeBSD underneath limits driver support compared with Linux, so recent network cards and some virtualisation drivers can be unsupported or slow.
  • The plugin ecosystem is uneven in quality; some plugins are maintained by a single contributor and can lag a major release, breaking a function you depended on.
  • Community support is a forum, so an outage at two in the morning on the free edition is your problem alone unless you bought the business subscription in advance.

Pricing, plan by plan

LibreNMS

Free
  • LibreNMSFree
    • Full functionality
    • No usage limits
    • Community forum and GitHub support

OPNsense

Free
  • OPNsense Community EditionFree
    • MIT licence with no feature restrictions
    • All VPN, IDS and HA features included
    • Weekly updates and two major releases a year
  • OPNsense Business Edition$undefined/year
    • Stabilised update track lagging community releases
    • Commercial support from Deciso
    • Additional enterprise plugins and configuration backup

Which should you pick?

Choose LibreNMS if

  • You need snmp auto-discovery.
  • You want to start without paying.
  • You work on Linux, Web.
  • You also want device and os support.
LibreNMS review

Choose OPNsense if

  • You need stateful firewall on pf.
  • You want to start without paying.
  • You work on x86-64 appliances, Virtual machines, Deciso hardware.
  • You also want vpn suite.
OPNsense review

Questions people ask

Is LibreNMS or OPNsense better?
Neither clearly leads. LibreNMS starts at Free and OPNsense at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, LibreNMS or OPNsense?
LibreNMS starts at Free and OPNsense at Free.
Does LibreNMS or OPNsense run on more platforms?
LibreNMS runs on Linux, Web. OPNsense runs on x86-64 appliances, Virtual machines, Deciso hardware.
Can I use LibreNMS for free?
Both have a free tier, so you can try either at no cost before committing.
What is LibreNMS best used for?
LibreNMS is most often used for a network team wanting snmp-based device monitoring with zero licence cost and full control over the deployment, an organisation with in-house linux and networking expertise that does not need a vendor support contract, a team wanting an alternative to icinga that is focused specifically on network device polling rather than general infrastructure monitoring, a company wanting sla-backed support for librenms but without wanting to build that capability in-house, contracting the designated partner instead. Of those, a network team wanting snmp-based device monitoring with zero licence cost and full control over the deployment and an organisation with in-house linux and networking expertise that does not need a vendor support contract are not what OPNsense is typically brought in for.
What can LibreNMS do that OPNsense cannot?
LibreNMS covers SNMP auto-discovery, Device and OS support, Alerting, API. OPNsense covers Stateful firewall on pf, VPN suite, Suricata IDS and IPS, Full configuration API.

Answered from the vendors’ own pages

LibreNMS: Is LibreNMS really free with no paid tier of the software?

Yes, the software itself has no licence fee; only optional third-party support is paid.

OPNsense: How is it different from pfSense?

It is a 2015 fork with an MIT licence, a fixed weekly release cadence, a complete configuration API and a different interface. Feature coverage is comparable; the release process and API are the real differences.

LibreNMS: Who provides paid support?

Config Services Ltd is the designated partner offering SLA-backed support and consultancy for LibreNMS.

OPNsense: Do I need the Business Edition?

Only if you want commercial support or a slower, stabilised update stream. No features are withheld from the community edition.

LibreNMS: Does LibreNMS require SNMP access to every device?

Yes, its core monitoring approach relies on SNMP polling, so devices must have SNMP enabled and reachable.

OPNsense: Can it handle a gigabit internet connection?

Plain firewalling on modest current hardware, comfortably. With Suricata inspection enabled, expect to need a considerably stronger CPU.

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