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Government · head to head

Citizen vs Tenable Nessus

Citizen logo

Citizen

Government

Real-time Safety Alerts

From
Free
Free plan
Yes
Full reviewWebsite
Tenable Nessus logo

Tenable Nessus

Cybersecurity

Network vulnerability scanner

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Citizen no premium or paid features mentioned; Tenable Nessus nessus Professional is $4,790 for one year, sold as an annual licence rather than a per scan or usage based fee
  • They diverge on capability: Citizen covers Real-time Alerts, Tenable Nessus covers Network scanning.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Citizen and Tenable Nessus actually diverge.

Attributes where Citizen and Tenable Nessus differ
AttributeCitizenTenable Nessus
Pricing modelfreemiumsubscription
PlatformsIos, AndroidWindows, Linux, Macos, Cloud
CategoryGovernmentCybersecurity
Founded20162002

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Citizen

  • Real-time Alerts
  • 911 Monitoring
  • Live Video
  • Safety Map
  • Personal Safety
  • Emergency Services
  • Social Media
  • Location Services

Only in Tenable Nessus

  • Network scanning
  • Vulnerability detection
  • Configuration assessment
  • Malware detection
  • Compliance checking
  • Cloud security assessment
  • Mobile scanning
  • API access

What people use each for

The jobs each tool is most often brought in to do.

Citizen

  • Citizen Servicesnot Tenable Nessus
  • Records Managementnot Tenable Nessus
  • Public Safetynot Tenable Nessus
  • Civic Engagementnot Tenable Nessus

Tenable Nessus

  • Vulnerability scanning of servers, network devices and web applicationsnot Citizen
  • Configuration and compliance auditing against hardening benchmarksnot Citizen
  • Point in time assessments by consultants and penetration testersnot Citizen

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Citizen

  • No premium or paid features mentioned
  • App is completely free with no monetization model disclosed
  • No in-app purchases or premium tier mentioned
  • Subscription or paid features may exist but not disclosed

Tenable Nessus

  • Nessus Professional is $4,790 for one year, sold as an annual licence rather than a per scan or usage based fee
  • Support beyond the base entitlement costs an extra $400 per year for Advanced Support with 24x365 phone and chat access
  • The on demand training course is a separate $275 purchase for a single person for one year
  • Multi year discounts require paying for two or three years up front

Pricing, plan by plan

Citizen

Free
  • BasicFree
    • Real-time Alerts
    • Incident Feed
    • Safety Map

Tenable Nessus

Free
  • Nessus EssentialsFree
    • Up to 16 ips
    • Network scanning
    • Vulnerability assessment
  • Nessus Professional$2600/year
    • Unlimited targets
    • Enterprise features
    • Advanced analytics
  • Nessus Expert$5200/year
    • All Professional features
    • Cloud integration
    • Advanced reporting

Which should you pick?

Choose Citizen if

  • You need real-time alerts.
  • You want to start without paying.
  • You work on Ios, Android.
  • You also want 911 monitoring.
Citizen review

Choose Tenable Nessus if

  • You need network scanning.
  • You want to start without paying.
  • You work on Windows, Linux, Macos, Cloud.
  • You also want vulnerability detection.
Tenable Nessus review

Questions people ask

Is Citizen or Tenable Nessus better?
Neither clearly leads. Citizen starts at Free and Tenable Nessus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Citizen or Tenable Nessus?
Citizen starts at Free and Tenable Nessus at Free.
Does Citizen or Tenable Nessus run on more platforms?
Citizen runs on Ios, Android. Tenable Nessus runs on Windows, Linux, Macos, Cloud.
Can I use Citizen for free?
Both have a free tier, so you can try either at no cost before committing.
What is Citizen best used for?
Citizen is most often used for citizen services, records management, public safety, civic engagement. Of those, citizen services and records management are not what Tenable Nessus is typically brought in for.
What can Citizen do that Tenable Nessus cannot?
Citizen covers Real-time Alerts, 911 Monitoring, Live Video, Safety Map. Tenable Nessus covers Network scanning, Vulnerability detection, Configuration assessment, Malware detection.

Answered from the vendors’ own pages

Citizen: How much does Citizen cost?

Citizen is available as a free app download for iOS and Android. The app includes core safety and alert features at no cost.

Source
Tenable Nessus: What are the three Nessus offerings?

Nessus Essentials is a free introductory offering for educators, students, and career starters, limited to 16 IPs for scanning. Nessus Professional is designed for consultants and SMBs, providing unlimited IT scans across any location. Nessus Expert is the premium offering extending Professional with web application scanning, infrastructure-as-code scanning, and external attack surface assessment up to 5 domains.

Source
Citizen: Are there paid features or premium subscriptions in Citizen?

Citizen's website does not mention paid features, premium subscriptions, or in-app purchases. All advertised features appear to be included in the free app.

Source
Tenable Nessus: What OS platforms does Nessus support?

Nessus runs on Debian/Kali Linux, Fedora, FreeBSD, Mac OS X, Red Hat/CentOS, SUSE Linux, Ubuntu, and various Windows versions including Server 2008, 2012, and Windows 7-10.

Source
Tenable Nessus: Can I use Nessus to scan third-party networks as a consultant?

Yes, Tenable permits you to use Nessus to scan third-party networks. Nessus Professional is ideal for consultants.

Source
Tenable Nessus: Can Nessus perform PCI external scanning?

Yes, you can use Nessus Professional to perform external network scans as required by the PCI DSS 11.2.2 requirement.

Source
Tenable Nessus: What additional features does Nessus Expert provide?

Web application scanning, which is dynamic application security testing (DAST) providing comprehensive visibility and insight into web application security issues; scanning code repositories for vulnerabilities; and assessing external attack surface with subdomain discovery.

Source
Tenable Nessus: What support options exist for Nessus Professional?

Standard Support includes software upgrades, patches, plugin access, and 24x7 support via chat and community portal. Advanced Support adds 24x7 phone access and committed SLAs: P1 less than 2 hours, P2 less than 4 hours, P3 less than 12 hours, P4 less than 24 hours.

Source
Tenable Nessus: How frequently are Nessus plugins updated?

Nessus plugins are updated daily, based on when vendors and security research sites publish new vulnerabilities.

Source
Tenable Nessus: How does licensing work in virtual machine environments?

Whether you are using Nessus in a physical or a virtual environment, the IP addresses or hosts that you are scanning from must be licensed.

Source
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