We may earn a commission if you buy through links on this page. It never changes a score or a ranking. How we make money
Security Onion Pro is a feature-rich, self-hosted security platform, but its Pro pricing is quote-based and hard to compare. The six options below are not direct substitutes: they range from firewalls and cloud security to vulnerability scanning. The published material gives no Reddit departure reasons, so we frame these as practical switching triggers—not claims about what users said. If on-premises monitoring is a must, confirm coverage and deployment details with each vendor before treating an alternative as a replacement.
01Why people leave Security Onion Pro
Quote-based Pro pricing
The available listing says Pro pricing is quote-based and hard to compare, making a clear cost check a reasonable trigger to evaluate alternatives.
Looking beyond self-hosting
Security Onion is self-hosted. Buyers considering a cloud security option can compare Zscaler Cloud IPS, but should get its scope and quote in writing.
A narrower security task
If the requirement is vulnerability scanning rather than a broad security platform, Nessus is listed for unlimited vulnerability scans and web app scans.
02The alternatives, ranked by fit
- Network firewall deployments
pfSense PluspfSense PluspfSense Plus is a closer fit if you are evaluating network functions rather than seeking a like-for-like Security Onion replacement. The listing names Netgate appliances, AWS or Azure firewall deployments, VPN and VPC connectivity. It starts at $10.75 and has a free plan. The source does not establish monitoring-feature parity, and it advises checking the full bill and upgrade terms.
Trade-off: The listing does not establish equivalent security monitoring coverage.
6.7/10from
$10.75/mofree plan - Commercial firmware control
OPNsense Business EditionOPNsense Business EditionOPNsense Business Edition is worth considering if controlled firmware and business features matter more than matching Security Onion’s broader platform description. It starts at $11.08 and is listed for multi-installation operators considering OPNcentral. The source does not say it matches Security Onion’s monitoring coverage, so verify the functions you need before switching.
Trade-off: The source does not confirm feature parity with Security Onion.
7.3/10from
€11.08/mo - Enterprise firewall buyers
Check Point Quantum Security GatewaysCheck Point Quantum Security GatewaysCheck Point Quantum Security Gateways may fit enterprises looking for a hardware firewall option across hybrid on-premises and cloud environments. That is a different buying decision from adopting a self-hosted security platform, so confirm which monitoring requirements it covers. Pricing is quote-only, and the listing notes limited public detail; ask for subscription scope and costs in writing.
Trade-off: Quote-only pricing and limited public detail make comparison harder.
6.5/10from
Custom - Cloud IPS evaluation
Zscaler Cloud IPSZscaler Cloud IPSZscaler Cloud IPS is relevant if you are already considering Zscaler or want to assess a broader security platform. It offers a cloud-oriented alternative to Security Onion’s self-hosted deployment, but the listing does not establish equivalent monitoring scope. Get the Cloud IPS scope and a written quote before deciding whether it covers the work you need.
Trade-off: Pricing is not published, and scope needs written confirmation.
5.5/10from
Custom - Vulnerability scanning teams
NessusNessusNessus is a narrower choice if your main requirement is vulnerability scanning, not a broad self-hosted security platform. The listing includes unlimited vulnerability scans and web app scans, with pricing from $399.17. It also flags a $4,790 entry license as a serious commitment, so check the license cost and fit before switching.
Trade-off: A $4,790 entry license is a substantial commitment.
6.5/10from
$399.17/mo - Zero trust access controls
Zscaler Zero Trust ExchangeZscaler Zero Trust ExchangeZscaler Zero Trust Exchange is worth evaluating if the goal is to consolidate zero trust controls, secure private app access or protect AI deployments. Those are distinct needs from Security Onion’s self-hosted security monitoring description. The listing flags meaningful access limits and no published pricing, so confirm the limits and obtain a quote before comparing costs.
Trade-off: No published pricing; the listing flags meaningful access limits.
6.3/10from
Custom
03Side by side
| Tool | Score | From | Free plan | Best for |
|---|---|---|---|---|
| Security Onion Pro Security Onion Pro (current) | 6.7 | Free | Yes | Organizations needing on-premises security monitoring |
| pfSense Plus pfSense Plus | 6.7 | $10.75/mo | Yes | Netgate appliance buyers |
| OPNsense Business Edition OPNsense Business Edition | 7.3 | €11.08/mo | No | Teams wanting a commercial firmware repository |
| Check Point Quantum Security Gateways Check Point Quantum Security Gateways | 6.5 | Custom | No | Enterprises seeking hardware firewalls |
| Zscaler Cloud IPS Zscaler Cloud IPS | 5.5 | Custom | No | Organizations already considering Zscaler |
| Nessus Nessus | 6.5 | $399.17/mo | No | Teams needing unlimited vulnerability scans |
| Zscaler Zero Trust Exchange Zscaler Zero Trust Exchange | 6.3 | Custom | No | Organizations consolidating zero trust controls |
Questions people ask
Which alternative is closest to Security Onion Pro?
The published descriptions do not identify a direct, feature-equivalent replacement. pfSense Plus and OPNsense Business Edition cover network functions and business features, while Check Point is a hardware firewall option. Compare each against your required monitoring functions and deployment model before switching.
How much does Security Onion Pro cost?
The pricing page says Security Onion Pro pricing is quote-based and hard to compare; it does not publish a price. Several alternatives also lack published pricing. The listed starting prices include $10.75 for pfSense Plus, $11.08 for OPNsense Business Edition and $399.17 for Nessus.
Which option should I consider for on-premises use?
Security Onion is described as self-hosted. The alternatives list identifies Check Point Quantum Security Gateways for hardware firewalls in hybrid on-premises and cloud environments, and pfSense Plus for Netgate appliance buyers. The published descriptions do not confirm either as a full replacement for Security Onion’s monitoring coverage.