What does AI recommend for vulnerability scanning tools (small businesses)? Checked 2026-10-24

Claude (Anthropic) with web search claude-opus-5 asked 2026-10-24

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best vulnerability scanning tools for small businesses. This page records one answer on one date. It is a measurement, not a ranking and not a recommendation.

Brands named, in the order the engine gave

1. Intruder mentioned
   Intruder - Best default for most small businesses.
2. CISA mentioned
   CISA Cyber Hygiene Scanning - Do this one regardless of what else you buy, because it's free.
3. Tenable Nessus mentioned
   Tenable Nessus - The industry reference scanner, and what an auditor or pentester will recognize.
4. Nessus mentioned
   Tenable Nessus - The industry reference scanner, and what an auditor or pentester will recognize.
5. Nessus Essentials mentioned
   Two caveats: Nessus Essentials is free but capped at 16 IPs (fine for a very small office, not a real program), and Nessus Professional runs roughly $3,400-$4,800/year depending on term and source.
6. 16 IPs mentioned
   Two caveats: Nessus Essentials is free but capped at 16 IPs (fine for a very small office, not a real program), and Nessus Professional runs roughly $3,400-$4,800/year depending on term and source.
7. Nessus Professional mentioned
   Two caveats: Nessus Essentials is free but capped at 16 IPs (fine for a very small office, not a real program), and Nessus Professional runs roughly $3,400-$4,800/year depending on term and source.
8. Professional mentioned
   Two caveats: Nessus Essentials is free but capped at 16 IPs (fine for a very small office, not a real program), and Nessus Professional runs roughly $3,400-$4,800/year depending on term and source.
9. Greenbone OpenVAS mentioned
   Greenbone OpenVAS Community Edition - The free, self-hosted option with no host cap, which is its big advantage over Nessus Essentials.
10. Greenbone OpenVAS Community Edition mentioned
    Greenbone OpenVAS Community Edition - The free, self-hosted option with no host cap, which is its big advantage over Nessus Essentials.
11. OpenVAS mentioned
    Greenbone OpenVAS Community Edition - The free, self-hosted option with no host cap, which is its big advantage over Nessus Essentials.
12. Community Edition mentioned
    Greenbone OpenVAS Community Edition - The free, self-hosted option with no host cap, which is its big advantage over Nessus Essentials.
13. Astra Security mentioned
    Astra Security - Worth a look if you have a web app or SaaS product and need to hand a clean report to a customer or auditor.
14. Snyk mentioned
    Snyk - Only if you write software.

Sources the engine cited

The answer, as recorded

## My shortlist, in the order I'd actually suggest them **1. Intruder** - Best default for most small businesses. Cloud-based, external + internal scanning, genuinely good at surfacing the handful of things that matter instead of a 400-page PDF. No appliance to maintain, and it's the one tool on this list whose customer base is actually majority small business (~57% of reviews). Entry pricing starts around **$149/month**, with the fuller plan around $199/month. ([G2 comparison](https://www.g2.com/compare/intruder-vs-tenable-nessus-vs-insightvm-nexpose), [Intruder](https://www.intruder.io/blog/the-top-vulnerability-scanning-tools)) **2. CISA Cyber Hygiene Scanning** - Do this one regardless of what else you buy, because it's **free**. CISA continuously scans your internet-facing IPs and sends weekly reports with remediation guidance; setup is an email and some paperwork, scanning starts within ~72 hours. Many cyber-insurance carriers accept these reports in place of a paid annual third-party scan, which is a real money-saver. US organizations only. ([CISA](https://www.cisa.gov/resources-tools/services/free-cybersecurity-services-and-tools-cyber-hygiene-vulnerability-scanning-archive), [FTC](https://www.ftc.gov/business-guidance/blog/2019/12/free-vulnerability-scanning-your-business)) **3. Tenable Nessus** - The industry reference scanner, and what an auditor or pentester will recognize. ~430,000 plugins covering ~146,000 CVEs, fastest scan times in head-to-head benchmarks, low false positives. Two caveats: **Nessus Essentials is free but capped at 16 IPs** (fine for a very small office, not a real program), and Nessus Professional runs roughly **$3,400-$4,800/year** depending on term and source. Pick it if you need compliance evidence; skip it if you just want to know what's exposed. ([ethicalhacking.ai](https://ethicalhacking.ai/compare/nessus-vs-openvas), [Capterra](https://www.capterra.co.uk/software/130577/nessus)) **4. Greenbone OpenVAS Community Edition** - The free, self-hosted option with **no host cap**, which is its big advantage over Nessus Essentials. 160,000+ vulnerability tests. The cost is your time: it's materially slower (roughly 5x on authenticated scans, much worse unauthenticated) and you own the maintenance. Right call if you have someone technical and no budget. ([ethicalhacking.ai](https://ethicalhacking.ai/compare/nessus-vs-openvas)) **5. Astra Security** - Worth a look if you have a web app or SaaS product and need to hand a clean report to a customer or auditor. Combines automated DAST with human-assisted pentesting and compliance-mapped reporting - that human layer is what you're paying for. ([Astra](https://www.getastra.com/blog/dast/vulnerability-scanning-for-smbs/)) **6. Snyk** - Only if you write software. It scans dependencies, containers and IaC rather than your network, and auto-opens fix PRs. It's a complement to everything above, not a substitute. ([Xygeni](https://xygeni.io/blog/top-vulnerability-scanning-tools/)) ## What I'd actually do Sign up for CISA scanning today (free, covers your perimeter), and put Intruder on a trial. That combination covers the large majority of realistic small-business exposure for under $2k/year. Add Nessus Pro only when a compliance framework or a customer contract forces the issue, and add Snyk only if you ship code. One thing worth flagging: scanning is the easy half. The tools will find more than you can fix, so decide up front who owns remediation and on what cadence - otherwise you're buying a report nobody reads.

Recorded 2026-10-24 through Claude (Anthropic) with web search, model claude-opus-5. Permanent address: /answers/s/vulnerability-scanning-tools-small-businesses-2026-10-24

Sources cited across the 21 recorded answers to this question

Alphabetical. A domain with a dated record links to it; the record says how often and when. Is one of these your site? Its record lists every recorded answer that cited it and carries the alert for the next citation.

beaglesecurity.com · blueheadline.com · capterra.co.uk · checkmarx.com · cipherssecurity.com · cisa.gov · cybersectools.com · cybersecuritynews.com · cybersecuritypricing.org · datamation.com · decryptiondigest.com · esecurityplanet.com · ethicalhacking.ai · ftc.gov · g2.com · getapp.com · getastra.com · github.com · greenbone.net · heimdalsecurity.com · helpnetsecurity.com · ifeeltech.com · infosectrain.com · intruder.io · invicti.com · learn.microsoft.com · luniq.io · microsoft.com · ninjaone.com · pcicompliance.com · penetrify.cloud · rapid7.com · secably.com · secrails.com · selecthub.com · tech-insider.org · tenable.com · toolradar.com · tuxcare.com · upguard.com · xygeni.io

Earlier recordings of this question

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Markdown edition · all recorded answers · weekly source index · AEO Watch

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.