FortiNAC vs Tenable Nessus Comparison: Reviews, Features, Pricing & Alternatives in 2026

Detailed side-by-side comparison to help you choose the right solution for your team

Updated Apr 2026 8 min read

FortiNAC

0.0 (0 reviews)

FortiNAC is a network access control solution that provides visibility, control, and automated response for every device connecting to your multi-vendor network environment.

Starting at --
Free Trial NO FREE TRIAL
VS

Tenable Nessus

0.0 (0 reviews)

Nessus is a vulnerability assessment solution providing deep-point-in-time scans to identify security flaws, misconfigurations, and malware across your modern IT infrastructure, including cloud, containers, and traditional assets.

Starting at Free
Free Trial 7 days

Quick Comparison

Feature FortiNAC Tenable Nessus
Website fortinet.com tenable.com
Pricing Model Custom Freemium
Starting Price Custom Pricing Free
FREE Trial ✘ No free trial ✓ 7 days free trial
Free Plan ✘ No free plan ✓ Has free plan
Product Demo ✓ Request demo here ✓ Request demo here
Deployment on-premise saas saas on-premise desktop
Integrations FortiGate Cisco Switches Aruba Wireless ServiceNow Microsoft Active Directory Okta Splunk HP ProCurve Juniper Networks Extreme Networks ServiceNow Splunk AWS Microsoft Azure Google Cloud Platform Jira Slack IBM QRadar
Target Users mid-market enterprise small-business mid-market enterprise
Target Industries healthcare education manufacturing
Customer Count 0 0
Founded Year 2000 2002
Headquarters Sunnyvale, USA Columbia, USA

Overview

F

FortiNAC

FortiNAC gives you complete visibility and control over everything on your network. As your environment grows with IoT devices, BYOD, and guest users, you can automatically identify and profile every single endpoint the moment it tries to connect. You no longer have to wonder what is on your wire or in your air; the system sees it all and applies your security policies instantly.

You can implement micro-segmentation to ensure devices only access the specific resources they need, significantly reducing your attack surface. If a device starts behaving strangely or becomes compromised, the platform can automatically quarantine it or kick it off the network without you lifting a finger. It works across your existing switches and wireless access points, making it a flexible choice for securing complex, multi-vendor infrastructures.

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Tenable Nessus

Nessus helps you identify and fix security vulnerabilities before attackers can exploit them. You can scan your entire environment—including cloud instances, web applications, and traditional network hardware—to find missing patches, software flaws, and configuration errors. It provides a clear view of your attack surface so you can prioritize the most critical risks to your business.

You can choose between different versions depending on your needs, ranging from a free version for educators and students to professional and expert versions for security consultants. It simplifies the complex task of vulnerability assessment with pre-built templates and automated reporting. Whether you are securing a small office or a complex hybrid-cloud environment, you can rely on its extensive plugin library to stay protected against the latest threats.

Overview

F

FortiNAC Features

  • Agentless Visibility Scan and identify every device on your network without installing software on the endpoints themselves.
  • Dynamic Segmentation Assign devices to specific network segments automatically based on their role, type, and security posture.
  • Automated Response Set up triggers to automatically isolate or quarantine devices that show signs of compromise or policy violations.
  • IoT Security Profile and secure headless IoT devices that cannot run traditional security agents or antivirus software.
  • Guest Onboarding Provide a secure self-service portal for visitors to access your Wi-Fi without compromising your internal data.
  • Multi-Vendor Support Manage security policies across hundreds of different third-party switches and wireless access points from one interface.
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Tenable Nessus Features

  • Pre-Built Scan Templates. Start scanning immediately using over 450 pre-configured templates for common audits like PCI-DSS and HIPAA compliance.
  • Live Results. Perform offline vulnerability analysis against your scan history to find new threats without running a new scan.
  • Cloud Infrastructure Scanning. Assess your cloud-native assets and identify misconfigurations in AWS, Azure, and Google Cloud environments easily.
  • Customizable Reporting. Create tailored reports in multiple formats like HTML or PDF to share critical security findings with your stakeholders.
  • Web Application Scanning. Identify vulnerabilities in your web applications and APIs to prevent common attacks like SQL injection and cross-site scripting.
  • External Surface Discovery. Find and map your internet-facing assets to understand what an attacker sees when looking at your organization.

Pricing Comparison

F

FortiNAC Pricing

T

Tenable Nessus Pricing

Nessus Essentials
$0
  • Scan up to 16 IP addresses
  • High-speed accurate scanning
  • Community support access
  • Standard vulnerability assessment
  • Free for educators and students

Pros & Cons

M

FortiNAC

Pros

  • Excellent visibility into unmanaged IoT and BYOD devices
  • Broad compatibility with diverse third-party networking hardware
  • Powerful automation rules for instant threat containment
  • Granular control over network access policies and segments

Cons

  • Initial configuration and setup can be quite complex
  • User interface feels dated compared to modern SaaS tools
  • Documentation can be difficult to navigate for new users
A

Tenable Nessus

Pros

  • Extremely high accuracy with very low false-positive rates
  • Massive library of plugins updated daily for new threats
  • Easy to set up and run your first scan quickly
  • Detailed remediation instructions help you fix issues faster

Cons

  • Annual subscription cost is high for small businesses
  • Interface can feel dated compared to newer cloud platforms
  • Reporting customization requires a learning curve to master
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