Both are free, open source firewall and router platforms built on FreeBSD and run from a web interface, so either can protect a small office or a home lab. Pick pfSense if you want the option of Netgate's appliances, cloud images and paid support behind it. Pick OPNsense if you want a fixed twice-a-year release rhythm, a simple 2-clause licence and intrusion prevention with Suricata built into the feature list.
I read the pfSense documentation and download page, Netgate's pfSense Plus pages, and the OPNsense home, features and release pages. The short version: these two do the same job, and the differences that matter are who stands behind each one and how updates reach you.
pfSense and OPNsense side by side
| pfSense | OPNsense | |
|---|---|---|
| How the project describes itself | A customised FreeBSD distribution for use as a firewall and router | An open source firewall and routing platform with commercial-grade features |
| Editions | pfSense CE (community) and pfSense Plus from Netgate | Community releases plus a Business Edition |
| Current versions named | CE 2.8.1 on the download page; Plus 26.07 in the docs | 26.7, codenamed Xenial Xenops, on FreeBSD 15.1 |
| VPN options | IPsec, OpenVPN and WireGuard in the docs | IPsec, OpenVPN and WireGuard, with Tinc as a plugin |
| Intrusion prevention | IDS/IPS capabilities listed in the docs | Inline prevention with Suricata and Emerging Threats Open rules |
| Hardware and cloud | Netgate appliances, plus pfSense Plus images for AWS and Azure | DEC appliances sold through the official OPNsense shop |
| Free option (as of October 2026) | Yes, pfSense CE is free open source software | Yes, the whole platform is free to download |
Where pfSense comes from
The pfSense docs say the project was forked from m0n0wall in 2004 and grew from a small embedded firewall into a full platform for routing, VPN and intrusion detection. You don't need to know FreeBSD to run it; the documentation says most users have never touched FreeBSD outside pfSense. It claims millions of downloads and hundreds of thousands of active installations, from single home networks to large universities.
One change worth knowing if you used it years ago: CE and Plus downloads now go through the Netgate Installer, which you reach via Netgate's online store rather than a plain image link. Netgate also sells TAC support subscriptions, professional services and what it calls the only official pfSense training, which matters if a business wants someone to call.
What OPNsense puts on the front page
OPNsense leads with features. Its home page lists a stateful firewall for IPv4 and IPv6 with a live view of blocked and passed traffic, multi WAN load balancing and failover, hardware failover with CARP state sync, NetFlow reporting, and inline intrusion prevention with Suricata. It also says it's the only open source security platform with a simplified 2-clause licence.
The release rhythm is easy to plan around. The OPNsense release notes show two community series a year, one ending .1 and one ending .7, going all the way back to 15.1, with the Business Edition on its own .4 and .10 schedule. Under the hood there's a Model View Controller framework with an API, which helps if you want to automate changes.
The sign-in side of security is covered in my comparison of Okta and Duo.
How to choose between them in five steps
- List what you need on day one: VPN type, number of internet lines and whether you want intrusion prevention.
- Decide whether you want vendor hardware. Netgate builds pfSense appliances; the OPNsense shop sells DEC boxes.
- Check the update style you prefer: OPNsense's two named releases a year, or pfSense's CE and Plus tracks.
- If you run in AWS or Azure, note that Netgate offers pfSense Plus virtual appliances there.
- Install your pick on a spare machine or VM, copy your rules across and run it for a week before it guards anything important.
If you're also weighing remote access for staff, read how VPNs work and what they protect, and these signs a business takes information security seriously.
My advice on pfSense or OPNsense
For a small business with no network specialist, I'd lean towards whichever one your IT person already knows, because the firewall you understand is the one you'll keep patched. If you're starting fresh and like predictable releases, OPNsense's twice-yearly cycle and clear feature list make it easy to live with. If you'd rather buy a box with support from the people who build the software, pfSense on Netgate hardware is the more natural route. Either way, it's free to try, so test before you switch.
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Frequently asked questions
Is pfSense free?
pfSense CE is free open source software. Netgate's pfSense Plus runs on its appliances and cloud images, and Netgate sells support subscriptions.
Is OPNsense based on pfSense?
The OPNsense pages I read describe it as an open source firewall and routing platform based on FreeBSD; they don't describe its origins, so I won't guess.
What is the latest OPNsense version?
The OPNsense site shows version 26.7, Xenial Xenops, powered by FreeBSD 15.1.
Does pfSense support WireGuard?
Yes. The pfSense documentation has WireGuard alongside IPsec, OpenVPN and L2TP in its VPN section.
Can OPNsense run intrusion prevention?
Yes. It lists inline intrusion prevention with Suricata and Proofpoint's Emerging Threats Open rules, with ET PRO as an optional commercial feed.
