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Networking · head to head

OPNsense vs ThousandEyes

OPNsense logo

OPNsense

Networking

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

From
Free
Rated
-
Full reviewWebsite
ThousandEyes logo

ThousandEyes

Networking

Internet and network path monitoring, owned by Cisco but still sold as a standalone product on its own annual contracts

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only OPNsense has a free tier, so it costs nothing to try first.
  • Each has a real cost: 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on.; ThousandEyes cisco does not publish a current definitive rate card, so any price a buyer finds online is likely outdated and should be confirmed directly with sales before budgeting
  • They diverge on capability: OPNsense covers Stateful firewall on pf, ThousandEyes covers Path visualisation.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which OPNsense and ThousandEyes actually diverge.

Attributes where OPNsense and ThousandEyes differ
AttributeOPNsenseThousandEyes
Starting priceFreeOn request
Pricing modelOpen source, no licence feequote, unit-based consumption on annual or prepaid contracts
Free tierYesNo
Platformsx86-64 appliances, Virtual machines, Deciso hardwareWeb, API

Identical on both: 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 OPNsense

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

Only in ThousandEyes

  • Path visualisation
  • Cloud, enterprise and endpoint agents
  • Internet Insights
  • Cisco ecosystem integration
  • Unit-based consumption billing

What people use each for

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

OPNsense

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

ThousandEyes

  • A network operations team at a large enterprise needing to diagnose whether a performance problem sits inside their network, with an ISP, or at the destinationnot OPNsense
  • An organisation already standardised on Cisco networking wanting internet path monitoring that integrates with existing Cisco toolingnot OPNsense
  • A company needing endpoint agent testing from real employee devices to reproduce user-reported performance issuesnot OPNsense
  • An SRE team wanting aggregated internet outage and BGP visibility across a wide customer base rather than building that dataset themselvesnot OPNsense

Where each one falls short

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

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.

ThousandEyes

  • Cisco does not publish a current definitive rate card, so any price a buyer finds online is likely outdated and should be confirmed directly with sales before budgeting
  • A 12-month minimum contract removes the option to trial the platform under real production load on a shorter commitment
  • Unit-based consumption billing across different test types is not always intuitive to forecast, and usage can grow unpredictably as more tests and agents are added
  • Since the Cisco acquisition, purchasing now runs through Cisco's broader enterprise sales and licensing process, which can be slower and less transparent than dealing with a smaller standalone vendor
  • Deep Cisco ecosystem integration is a real advantage only for organisations already standardised on Cisco; it offers less differentiated value for a non-Cisco shop
  • Endpoint agent pricing tiers (Essentials versus Advantage) gate meaningfully different capability, and choosing the wrong tier at signup can mean a contract renegotiation to get needed features

Pricing, plan by plan

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

ThousandEyes

On request
  • ThousandEyes$undefined/year
    • Cloud and enterprise agent testing
    • Endpoint agents
    • Internet Insights

Which should you pick?

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

Choose ThousandEyes if

  • You need path visualisation.
  • You work on Web, API.
  • You also want cloud, enterprise and endpoint agents.
ThousandEyes review

Questions people ask

Is OPNsense or ThousandEyes better?
Neither clearly leads. OPNsense starts at Free and ThousandEyes at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OPNsense or ThousandEyes?
OPNsense has a free tier; the other does not. Paid plans start at Free for OPNsense and On request for ThousandEyes.
Does OPNsense or ThousandEyes run on more platforms?
OPNsense runs on x86-64 appliances, Virtual machines, Deciso hardware. ThousandEyes runs on Web, API.
Can I use OPNsense for free?
Yes. OPNsense has a free tier, so you can try it without paying. ThousandEyes starts at On request.
What is OPNsense best used for?
OPNsense is most often used for replacing a small business firewall appliance whose renewal quote exceeded the cost of the hardware, branch offices where the firewall configuration must be produced by ansible rather than by hand, sites that need wireguard and intrusion prevention on the same box without separate feature licences, a homelab or lab network needing vlan routing, multi-wan and dns filtering on one machine. Of those, replacing a small business firewall appliance whose renewal quote exceeded the cost of the hardware and branch offices where the firewall configuration must be produced by ansible rather than by hand are not what ThousandEyes is typically brought in for.
What can OPNsense do that ThousandEyes cannot?
OPNsense covers Stateful firewall on pf, VPN suite, Suricata IDS and IPS, Full configuration API. ThousandEyes covers Path visualisation, Cloud, enterprise and endpoint agents, Internet Insights, Cisco ecosystem integration.

Answered from the vendors’ own pages

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.

ThousandEyes: Is ThousandEyes still sold as a standalone product after the Cisco acquisition?

Yes, it remains a distinct, purchasable product line rather than being merged into another Cisco offering.

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.

ThousandEyes: Is there a published, current price list?

No, Cisco does not publish a definitive current rate card; historical unit prices exist online but should not be treated as confirmed 2026 pricing.

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.

ThousandEyes: What is the minimum contract length?

12 months.

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