Alternatives to OPNsense
The friendlier pfSense fork
OPNsense ranks #7 of 7 in Firewall software, with an Alt Score of 55. It is licensed under BSD-2-Clause, open source with paid hosting from Free and available on the web. 8 of 9 checklist rows are verified against a public source.
System administrators and small-to-medium organizations who need a full-featured network firewall/router without commercial licensing costs, as well as enterprises wanting a supported, open-source alternative to proprietary firewall appliances.
A FreeBSD-based firewall and routing platform with a web management UI, stateful IPv4/IPv6 filtering, multi-WAN load balancing and failover, and NAT/port forwarding. It includes built-in VPN support (IPsec, OpenVPN, WireGuard), Suricata-based intrusion detection/prevention, and traffic shaping, extendable through a plugin system and configuration API.
You install OPNsense on dedicated hardware or a virtual machine and deploy it as the gateway between networks, then configure firewall rules, VPN tunnels, and traffic shaping policies through its web interface. It inspects and filters traffic in real time, logging activity and enforcing the configured security and routing policies.
Where OPNsense stands out
Verified capabilities most alternatives don't have.
Why people leave OPNsense
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
Rows come from the Firewall software checklist (13 rows). Human-verified cells only. ? means the value has not been verified.
| Firewall software checklist | OPNsense | pfSense | NetGuard | LuLu | Little Snitch | GlassWire |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Outbound connection alerts | ||||||
| Per-app rules | ||||||
| Network-wide (router / gateway) | ||||||
| Profiles (home, public) | ||||||
| Open source | ||||||
| One-time purchase option | ||||||
| Traffic monitoring UI | ||||||
| IDS/IPS | ||||||
| Low overhead |
Every fact and feature listed for OPNsense is verified against its own pages. Each alternative is sourced on its own page.
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Starts at Free verified 2026-07-09
Community Edition free; Business Edition starts around €399 (3-year license).
Download the best open source firewall today
https://opnsense.org/download/ -
License BSD-2-Clause verified 2026-07-09
Simplified" license"
OPNsense is available under the BSD 2-Clause
https://docs.opnsense.org/legal.html -
Status active verified 2026-07-09
Deciso is thrilled to announce the release of OPNsense® 25.1, aptly called 'Ultimate Unicorn'… January 29, 2025
https://opnsense.org/thriving-tiger/ -
Pricing model OSS + paid hosting verified 2026-07-09
Community Edition free/OSS; paid Business Edition adds features and support.
Download the best open source firewall today
https://opnsense.org/download/ -
Platforms Web verified 2026-07-09
FreeBSD-based OS installed on dedicated hardware/VMs; administered via a web UI.
Install method: ISO installer image with live system capabilities running in VGA-only mode
https://opnsense.org/get-started/ -
Outbound connection alerts Partial verified 2026-07-09
IDS/IPS (Suricata) alerts on outbound traffic matching signatures; no per-connection desktop popups.
An Intrusion Detection System (IDS) watches network traffic for suspicious patterns and can alert operators when a pattern matches
https://docs.opnsense.org/manual/ips.html -
Per-app rules No verified 2026-07-09
Rules are IP/port/protocol at the network level; no per-application process filtering.
OPNsense contains a stateful packet filter, which can be used to restrict or allow traffic from and/or to specific networks
https://docs.opnsense.org/manual/firewall.html -
Network-wide (router / gateway) Yes verified 2026-07-09
OPNsense contains a stateful packet filter, which can be used to restrict or allow traffic from and/or to specific networks as well as influence how traffic should be forwarded
https://docs.opnsense.org/manual/firewall.html -
Profiles (home, public) No verified 2026-07-09
No home/public profile switching; it is a fixed network appliance.
OPNsense contains a stateful packet filter, which can be used to restrict or allow traffic from and/or to specific networks
https://docs.opnsense.org/manual/firewall.html -
Open source Yes verified 2026-07-09
Simplified" license"
OPNsense is licensed under an Open Source Initiative approved license … BSD 2-Clause
https://docs.opnsense.org/legal.html -
Traffic monitoring UI Yes verified 2026-07-09
Under Reporting ‣ Traffic you will find a traffic monitor which show the current amount of data flowing through your firewall, measured in bps (bits per second)
https://docs.opnsense.org/manual/reporting_traffic.html -
IDS/IPS Yes verified 2026-07-09
The Intrusion Prevention System (IPS) system of OPNsense is based on Suricata and utilizes Netmap to enhance performance and minimize CPU utilization. This deep packet inspection system is very powerf
https://docs.opnsense.org/manual/ips.html -
Low overhead No verified 2026-07-09
Runs as a dedicated full-OS appliance; not a minimal-footprint host agent.
Recommended specifications to run all OPNsense® standard features: 1.5 GHz multi core cpu, ≥ 4 GB RAM, 120 GB SSD
https://opnsense.org/get-started/
FAQ
Yes. NetGuard, GlassWire and Portmaster have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
pfSense, NetGuard and LuLu — every license claim links its source.