pfSense vs OPNsense (2026): Which Open Source Firewall to Choose

For most new builds in 2026, choose OPNsense: it is fully open source (2-Clause BSD), ships a major release every six months with frequent updates in between, and has a REST API built in. Choose pfSense if you are buying a Netgate appliance (it comes with pfSense Plus and support) or your team already relies on pfSense and its packages. pfSense CE is still free, but Netgate's newest features, such as Nexus and Snort 3, are Plus only. Both run on FreeBSD with the pf packet filter.

The rest of this guide explains where each one is ahead, using only figures from the vendors' own release notes, price lists and documentation, checked on October 16, 2026.

pfSense vs OPNsense at a glance

Every cell comes from the vendor sources listed with this post. The 2026 release counts are our tally from Netgate's versions page and the OPNsense 26.1 and 26.7 release notes; they exclude release candidates.

Is pfSense still free in 2026?

Yes, pfSense CE is still free. Netgate's subscription table lists pfSense CE at "No Charge" with an open source license, and the pfSense source repository on GitHub carries the Apache License 2.0. Netgate released CE 2.9.0 on August 20, 2026, describing it as including "over 150 new features, enhancements, and fixes."

The confusion comes from pfSense Plus. Netgate's FAQ says Plus is "a Netgate product, separate and distinct from pfSense Community Edition" and that it "is closed source." Plus is offered at no charge on Netgate appliances, and Netgate's appliance listings say each one includes "pfSense Plus SW w/lifetime upgrades" and TAC Lite support. To run Plus on your own hardware you need a TAC Lite subscription, which Netgate lists at $129 per year per instance. TAC Pro is $399 per year and TAC Enterprise is $799 per year.

Two things matter for the long term:

• The two editions have diverged. Netgate's FAQ says Plus started as a fork of CE 2.5 in February 2021 and that "over time they will diverge in terms of architecture, feature set, performance and manageability."
• New features land in Plus. The Plus 26.07 release notes list CoreDNS, ThreatGate and Snort 3 as "exclusive to Netgate Nexus," the new management layer for Plus. Netgate's own CE 2.9.0 announcement says, "We encourage users to migrate from pfSense CE software to pfSense Plus software."

So pfSense CE is free and maintained, but if you want everything Netgate is building, you are looking at Plus.

What OS is OPNsense built on, and how did it start?

OPNsense is built on FreeBSD. The 26.7 "Xenial Xenops" release notes list FreeBSD 15.1-RELEASE-p1 along with OpenSSL 3.5.7, OpenVPN 2.7.5 and PHP 8.5. pfSense is FreeBSD-based too: Netgate's versions table shows CE 2.9.0 and Plus 26.07 on FreeBSD 16.0-CURRENT.

OPNsense started as a fork of pfSense. The project's history page says that "back in 2014, after having sponsored pfSense® for years," Deciso forked it, and that "currently less than 10% of the original legacy code base remains." The fork page cites code quality, separating GUI logic from tasks that need root access, and openness of the build tools as reasons. OPNsense's code is under the 2-Clause BSD license, which the release notes describe as "clear and stable."

Release cadence: which gets updates faster?

This is where the two projects differ the most.

OPNsense runs to a published calendar. Its roadmap states, "We use a 6 months major release cycle with firm release dates." Version 26.1 "Witty Woodpecker" shipped on January 28, 2026, version 26.7 "Xenial Xenops" on July 15, 2026, and 27.1 is planned for January 2027. Between those majors come frequent point releases: the 26.1 series reached 26.1.11 on July 1, 2026, and the 26.7 series reached 26.7.7 on October 13, 2026. By our count, that is 20 community releases in 2026 so far.

pfSense Plus follows a year.month scheme. Netgate's FAQ says Plus customers can plan "around three releases per year." The versions table shows 25.11.1 (January 26), 26.03 (April 1), 26.03.1 (May 27) and 26.07 (August 13) in 2026, with the next Plus version still marked "TBD."

pfSense CE releases less often. The versions table lists 2.8.0 on May 28, 2025, 2.8.1 on September 4, 2025, and 2.9.0 on August 20, 2026. Between releases, Netgate ships some security fixes through the Recommended System Patches feature of the System Patches package, according to the 2.9.0 release notes, so CE users should install that package and check it regularly.

More releases are not automatically better. OPNsense's 26.7.7 notes say it was mainly for Hyper-V users who had kernel panics "since 26.7," fixed in 26.7.6 "only to cause segmentation faults for others." If you prefer a slower pace on OPNsense, the paid Business Edition exists for that. Deciso describes it as "a more selective upgrade path (lags behind the community edition)." Its 26.4 release shipped on April 15, 2026.

Which is more secure?

Neither has a clear security advantage you can measure from public sources. Both use FreeBSD and the pf packet filter, and both publish their fixes.

What you can compare is how fixes reach you:

• pfSense CE 2.9.0 added post-quantum SSH key exchange algorithms, removed older ones, and now regenerates a weak or expired GUI certificate during the upgrade. Netgate's announcement also mentions "critical security updates for WireGuard (CVE-2026-58085)." The Plus 26.07 notes list security advisories from pfSense-SA-26_06 to pfSense-SA-26_21.
• OPNsense ships fixes in its frequent point releases. Its fork page says the project offers "weekly security updates for all components" (that is OPNsense's own description).

In practice, the most secure firewall is the one you keep patched and configure carefully. Block lists help too: on pfSense, our guide to pfBlockerNG recommended feeds covers a sensible starting set. On OPNsense, version 26.1 added Unbound block list source selection to the community edition. If you are deciding between DNS services there, see OPNsense Dnsmasq vs Unbound, since 26.1 switched to Dnsmasq for default IPv6 support.

Which has the better web interface and API?

OPNsense has spent years moving pages to its MVC framework, and every page it moves gets API support. Its API documentation says, "All components that are using the full architecture of OPNsense automatically receive API capabilities," authenticated with per-user key and secret pairs. Release 26.7 moved interface assignments and gateway groups to MVC/API, made the MVC/API firewall rules the default, and moved the old PHP rule pages into an optional os-firewall-legacy plugin. It also added an opnsense-auto theme that follows your browser's dark mode setting.

pfSense is going through a bigger change. Netgate calls Netgate Nexus "the future of the pfSense GUI," with "a new updated GUI" and "a powerful, full-featured API." There are some catches:

• Nexus is a pfSense Plus feature. Netgate's FAQ says the controller ships with Plus version 25.11 or later.
• Netgate says "virtual machines as well as some third-party platforms may not support the new GUI." Its FAQ adds that "air-gapped, offline, virtual and some hardware systems without serial numbers" cannot be managed through multi-instance management.
• A controller manages its own instance by default. Managing more devices needs per-device entitlements, each valid for one year.

If you automate firewall changes with scripts, Ansible or an RMM tool, OPNsense gives you an API on any hardware at no cost. On pfSense, the official API path today is Plus with Nexus.

Hardware and performance

OPNsense supports x86-64 (amd64) processors only. Its documentation gives three sizing levels for the full feature set:

• Minimum: 1 GHz dual-core CPU, 3 GB RAM, installed to an SD or CF card of at least 4 GB (features that write to disk, such as a caching proxy or the IDS alert database, are excluded).
• Reasonable: 1 GHz dual-core CPU, 4 GB RAM, 40 GB SSD.
• Recommended: 1.5 GHz multi-core CPU, 8 GB RAM, 120 GB SSD.

The same page notes that each state table entry takes about 1 kB of RAM, so very busy networks need memory accordingly. Deciso also sells official appliances. The DEC677 in its DEC600 series, for example, lists 4 GB of RAM, four 2.5 GbE ports, 5000 Mbps of firewall throughput and one free year of the Business Edition.

pfSense on non-Netgate hardware needs a 64-bit amd64 CPU, 1 GB or more of RAM and an 8 GB or larger disk, according to Netgate's minimum requirements. Netgate notes that these minimums "are not suitable for all environments." Netgate appliances come with Plus preinstalled. The Netgate 1100 ($289) and Netgate 2100 ($599) use 2-core ARM64 CPUs, and the Netgate 4200 ($829) uses a 4-core Intel Atom. Netgate rates the 1100 at 607 Mbps of firewall throughput (iperf3, 10k ACLs) and the 2100 at 964 Mbps.

Throughput figures from each vendor are measured in different ways, so do not compare them directly. On the same x86 box, the deciding factor is usually which features you enable (IDS/IPS and proxies are the heavy ones), not which of the two you install.

One upgrade note for homelab boxes: Netgate warns that "some Celeron J devices" may hit a kernel panic booting CE 2.9.0, and gives a loader tunable to set before upgrading. On the OPNsense side, the 26.7 notes advise Hyper-V users to snapshot first.

Plugins and packages

Both have healthy add-on catalogs, and most homelab favorites exist on both.

pfSense packages listed by Netgate include pfBlockerNG, Snort, Suricata, HAProxy, ACME (Let's Encrypt certificates), FreeRADIUS, ntopng and WireGuard. pfBlockerNG is one of the main reasons people stay on pfSense. Netgate's FAQ says package support in Plus will be evaluated over time "based on customer demand and technology progression," and Snort 3 is already exclusive to the Nexus GUI on Plus.

OPNsense plugins documented by the project include nginx, Caddy, ClamAV, FreeRADIUS, Netbird, a Wazuh agent, Cloudflare Tunnel and ntopng. Suricata is part of the core system rather than a plugin, and 26.1 added an inline inspection mode. Zenarmor, which adds application-aware filtering, is listed among the third-party plugins (its vendor supports it, not the OPNsense project). We cover it in bringing intelligence to open source NGFW with Zenarmor. If you feed firewall logs into a SIEM, see our guide to installing Wazuh on Ubuntu Server 24.04.

Support, licensing and price

Prices are Netgate's and Deciso's list prices as shown on their sites on October 16, 2026. Deciso prices in euros. Check the vendor pages before you buy.

Which should you choose?

Homelab users

Choose OPNsense if you run your firewall on a mini PC or in Proxmox and want every feature for free, plus an API to experiment with. The six-month cycle and frequent point releases keep it current, and the free Community Edition gets new releases before the paid Business Edition does.

Choose pfSense CE if you are learning for a job that uses pfSense, or you depend on pfBlockerNG. pfSense also has a lot of community tutorials, including our own guides to netboot.xyz on pfSense with Docker and network access control on pfSense. Disclosure: SyncBricks sells a pfSense course, pfSense Network Security and Firewall Management on Udemy. We still recommend OPNsense for many new homelabs, for the reasons above.

Small businesses

Choose pfSense Plus on a Netgate appliance if you want hardware, software and a support contract from one vendor with a US price list. The appliance includes Plus and TAC Lite, and you can upgrade to TAC Pro for a 24-hour response target.

Choose OPNsense on a Deciso appliance, or on your own x86 hardware with the Business Edition, if you prefer open source code and a slower, more selective update path.

MSPs

Choose OPNsense if you manage many clients on mixed hardware, including virtual machines. The API works on any install, and the Business Edition includes OPNcentral for central upgrades and status monitoring.

Choose pfSense Plus with Netgate Nexus if your clients run Netgate appliances or AWS and Azure instances. Nexus gives you one GUI and a REST API across "one, or hundreds of pfSense Plus instances." Keep in mind that it is licensed per managed device per year and is limited on virtual and some third-party hardware.

If you are still comparing beyond these two, our list of the top 5 best free NGFW firewalls covers other options.

How to migrate between them

None of the vendor documentation we read describes a tool that converts a configuration from one to the other, so plan the move as a rebuild:

1. Back up and document. Export the current configuration and record interfaces, VLANs, aliases, firewall and NAT rules, VPN settings, DHCP reservations and DNS overrides.
2. Build in parallel. Install the new firewall on spare hardware or a virtual machine and recreate the configuration by hand, section by section.
3. Read the release notes. OPNsense 26.7 moved the legacy rule pages to a plugin and merged outbound NAT into source NAT. pfSense CE 2.9.0 tightened SSH algorithms and TLS certificate rules, which can break older clients.
4. Test, then cut over. Swap the WAN and LAN connections in a maintenance window and keep the old box ready to roll back.

Moving from pfSense CE to pfSense Plus is simpler. Netgate documents an in-place upgrade and says CE 2.6.0 and later include the registration changes needed to do it.

Whichever you pick, both are mature FreeBSD firewalls. The choice comes down to licensing, update rhythm, hardware and who will support you when something breaks.