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Nessus has a high entry cost: the published pricing lists $399.17 from and a $4,790 entry license. But the six products below are not presented in the published material as vulnerability scanners, so none is a proven like-for-like replacement. They may be worth comparing if your real goal is changing firewall, network access, or DDI tooling. If you need vulnerability scans, confirm scanning coverage, asset support, reporting, and total price with any vendor before switching.
01Why people leave Nessus
The entry license is expensive
The published pricing puts Nessus at $4,790 for an entry license. Reddit commenters also raised cost as a reason to compare other tools.
You need different asset coverage
In a Reddit discussion, commenters questioned whether Microsoft Defender would cover external scans and network hardware, while others favored it for Windows-heavy environments.
Reporting needs more scrutiny
One Reddit commenter called Nessus reporting difficult for assigning issues to asset owners without substantial data cleanup. Vet reporting before you commit.
02The alternatives, ranked by fit
- Broader security platform
Zscaler Cloud IPSZscaler Cloud IPSConsider Zscaler Cloud IPS if you are already weighing Zscaler or want a broader security platform. That may make it relevant when the reason for leaving Nessus is a wider security-platform decision, rather than scan coverage alone. The published information does not establish that Cloud IPS replaces Nessus vulnerability scanning, so ask Zscaler to define scope and scanning capabilities in writing.
Trade-off: Pricing is not published; confirm scope and get a quote.
5.5/10from
Custom - Enterprise firewall
Check Point Quantum Security GatewaysCheck Point Quantum Security GatewaysCheck Point Quantum Security Gateways may suit enterprises seeking hardware firewalls across hybrid on-premises and cloud environments. Compare it if your change is about firewall infrastructure, not simply replacing Nessus scans. The published information describes it as a feature-rich firewall option, but does not establish vulnerability-scanning parity or publish enough detail to assess the full fit.
Trade-off: Quote-only pricing and limited public detail.
6.5/10from
Custom - Network functions
pfSense PluspfSense PluspfSense Plus is aimed at Netgate appliance buyers, AWS or Azure firewall deployments, and teams needing VPN and VPC connectivity. Its listed starting price is $10.75, with a free plan noted. It may be relevant if you are changing network controls alongside Nessus, but the published description does not present it as a vulnerability scanner.
Trade-off: Check the full bill and upgrade terms.
6.7/10from
$10.75/mofree plan - Commercial firmware
OPNsense Business EditionOPNsense Business EditionOPNsense Business Edition is aimed at teams wanting a commercial firmware repository, businesses needing included security features, or operators considering OPNcentral for multiple installations. The listed starting price is $11.08. It could fit a network-platform change, but the published details do not establish that it can replace Nessus vulnerability scanning.
Trade-off: Weigh the upfront cost against your needs.
7.3/10from
€11.08/mo - Zero-trust controls
Zscaler Zero Trust ExchangeZscaler Zero Trust ExchangeZscaler Zero Trust Exchange is positioned for organizations consolidating zero-trust controls, securing private-app access, or protecting AI deployments. It is worth considering if the Nessus decision is part of a wider access-security change. The published information does not describe it as a vulnerability scanner, so do not treat it as a direct substitute without confirming capabilities.
Trade-off: Pricing is not published; access limits matter.
6.3/10from
Custom - DDI management
BlueCat EdgeBlueCat EdgeBlueCat Edge targets teams managing DDI across cloud and on-premises, connecting remote branches, or automating DDI through APIs. It may belong in a broader infrastructure review if Nessus is prompting a stack change, but it is not presented here as a scanning alternative. Ask for limits and pricing before comparing its value with a Nessus license.
Trade-off: Pricing and limits are opaque.
5.8/10from
Custom
03Side by side
| Tool | Score | From | Free plan | Best for |
|---|---|---|---|---|
 Nessus Nessus (current) | 6.5 | $399.17/mo | No | Teams needing unlimited vulnerability scans |
| Zscaler Cloud IPS Zscaler Cloud IPS | 5.5 | Custom | No | Organizations already considering Zscaler |
| Check Point Quantum Security Gateways Check Point Quantum Security Gateways | 6.5 | Custom | No | Enterprises seeking hardware firewalls |
| 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 |
| Zscaler Zero Trust Exchange Zscaler Zero Trust Exchange | 6.3 | Custom | No | Organizations consolidating zero trust controls |
| BlueCat Edge BlueCat Edge | 5.8 | Custom | No | Teams managing DDI across cloud and on-premises |
Questions people ask
Which listed option is the closest Nessus replacement?
None is established as a direct vulnerability-scanning replacement in the published product information. The options cover firewalls, security platforms, zero-trust access, and DDI. If vulnerability scanning is the requirement, confirm scan types, asset coverage, reporting, and licensing with vendors before treating any of these as a substitute.
Why do teams consider leaving Nessus?
The published Nessus summary lists a $4,790 entry license. In Reddit discussions, commenters also raised cost, questioned coverage for external scans and network hardware, and flagged reporting work as an evaluation concern. Those are reasons to compare products, not proof that another tool will fit better.
What should we verify before switching?
Confirm that the product actually performs the vulnerability scans you need, including coverage for your assets and environments. Check reporting and how findings reach asset owners. Ask for the full price, plan limits, and any upgrade terms in writing; the published details leave pricing or product scope unpublished for several options.