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Cybersecurity · head to head

Fortinet FortiGate vs OPNsense

Fortinet FortiGate logo

Fortinet FortiGate

Cybersecurity

Next-generation firewall with AI-powered threat protection

From
$500/year
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

  • Only OPNsense has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fortinet FortiGate security services are sold as separate FortiGuard subscription bundles, so ATP, UTP and ENT determine which protections are actually active; 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: Fortinet FortiGate covers Next-generation firewall, OPNsense covers Stateful firewall on pf.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Fortinet FortiGate and OPNsense actually diverge.

Attributes where Fortinet FortiGate and OPNsense differ
AttributeFortinet FortiGateOPNsense
Starting price$500/yearFree
Pricing modelsubscriptionOpen source, no licence fee
Free tierNoYes
PlatformsHardware, Virtual, Cloudx86-64 appliances, Virtual machines, Deciso hardware
CategoryCybersecurityNetworking
Founded2000Unknown

Identical on both: user rating (Not yet rated).

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 Fortinet FortiGate

  • Next-generation firewall
  • Intrusion prevention
  • SSL/TLS inspection
  • Application control
  • Web filtering
  • SD-WAN
  • Zero-trust network access
  • AI-powered threat detection

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.

Fortinet FortiGate

  • Next-generation firewalling at data centre, campus and branch scalenot OPNsense
  • Secure SD-WAN across distributed sitesnot OPNsense
  • Zero trust network access to internal applicationsnot OPNsense
  • Virtual firewalls in AWS, Azure, Google Cloud and Oraclenot OPNsense
  • Ruggedised deployments in industrial environmentsnot OPNsense

OPNsense

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

Where each one falls short

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

Fortinet FortiGate

  • Security services are sold as separate FortiGuard subscription bundles, so ATP, UTP and ENT determine which protections are actually active
  • Throughput is tied to the appliance model, from 500 Mbps on the FortiGate 30G to 520 Gbps on the 7121F, so capacity planning is a hardware purchase
  • Pricing is not published and goes through partners

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

Fortinet FortiGate

$500/year
  • FortiGate Entry$500/year
    • Basic firewall
    • VPN support
    • Threat protection
  • FortiGate Enterprise$2500/year
    • Advanced threat protection
    • SSL inspection
    • Application control
  • FortiGate Ultimate$10000/year
    • All Enterprise features
    • Zero-trust access
    • AI-powered analytics

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 Fortinet FortiGate if

  • You need next-generation firewall.
  • You work on Hardware, Virtual, Cloud.
  • You also want intrusion prevention.
Fortinet FortiGate 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 Fortinet FortiGate or OPNsense better?
Neither clearly leads. Fortinet FortiGate starts at $500/year and OPNsense at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fortinet FortiGate or OPNsense?
OPNsense has a free tier; the other does not. Paid plans start at $500/year for Fortinet FortiGate and Free for OPNsense.
Does Fortinet FortiGate or OPNsense run on more platforms?
Fortinet FortiGate runs on Hardware, Virtual, Cloud. OPNsense runs on x86-64 appliances, Virtual machines, Deciso hardware.
Can I use OPNsense for free?
Yes. OPNsense has a free tier, so you can try it without paying. Fortinet FortiGate starts at $500/year.
What is Fortinet FortiGate best used for?
Fortinet FortiGate is most often used for next-generation firewalling at data centre, campus and branch scale, secure sd-wan across distributed sites, zero trust network access to internal applications, virtual firewalls in aws, azure, google cloud and oracle. Of those, next-generation firewalling at data centre, campus and branch scale and secure sd-wan across distributed sites are not what OPNsense is typically brought in for.
What can Fortinet FortiGate do that OPNsense cannot?
Fortinet FortiGate covers Next-generation firewall, Intrusion prevention, SSL/TLS inspection, Application control. OPNsense covers Stateful firewall on pf, VPN suite, Suricata IDS and IPS, Full configuration API.

Answered from the vendors’ own pages

Fortinet FortiGate: What are the FortiGate security bundle options?

Fortinet offers three FortiGuard AI-Powered Security Services bundles: ENT Bundle (ultimate security for networks, web, file, SaaS, data, and devices), UTP Bundle (advanced web and network protection), and ATP Bundle (protection against network intrusions and malware with IPS, antivirus, and application control).

Source
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.

Fortinet FortiGate: How do I get pricing for FortiGate?

Pricing is not published on the product page. To obtain a quote, you can request a free product demo or connect with a security expert through the contact options on the site.

Source
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.

Fortinet FortiGate: Is there a free trial for FortiGate?

The product page does not mention a free trial. However, Fortinet offers a free product demo that allows you to evaluate the solution before committing to a purchase.

Source
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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