What Claude (Anthropic) with web search answered for vulnerability scanning tools (small businesses) on 2026-09-08

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-08

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

The question asked, verbatim: best vulnerability scanning tools for small businesses

Brands named, in the order the engine gave

1. Intruder recommended
   Intruder - The default recommendation if you have a handful of internet-facing assets and no dedicated security person.
2. OpenVAS mentioned
   Worth knowing what you're paying for: Essential runs OpenVAS under the hood, Cloud adds Nuclei, and Pro is where you get the Nessus engine - so the cheap tier is largely a managed wrapper around free tooling, which is fine if you value not running it yourself.
3. Nuclei mentioned
   Worth knowing what you're paying for: Essential runs OpenVAS under the hood, Cloud adds Nuclei, and Pro is where you get the Nessus engine - so the cheap tier is largely a managed wrapper around free tooling, which is fine if you value not running it yourself.
4. Tenable Nessus mentioned
   Tenable Nessus Professional - The deepest, most credible scanner pedigree, and the one auditors and pentesters recognize.
5. Tenable Nessus Professional mentioned
   Tenable Nessus Professional - The deepest, most credible scanner pedigree, and the one auditors and pentesters recognize.
6. Nessus Professional mentioned
   Tenable Nessus Professional - The deepest, most credible scanner pedigree, and the one auditors and pentesters recognize.
7. Microsoft mentioned
   Microsoft Defender for Business - Check this before buying anything.
8. Microsoft Defender mentioned
   Microsoft Defender for Business - Check this before buying anything.
9. Defender mentioned
   Microsoft Defender for Business - Check this before buying anything.
10. Check mentioned
    Microsoft Defender for Business - Check this before buying anything.
11. Microsoft 365 mentioned
    If you're on Microsoft 365 Business Premium, it's already included at no extra cost, and its vulnerability management module gives you software inventory, patch status, and per-device vulnerability findings with remediation guidance for up to 300 users.
12. Microsoft 365 Business mentioned
    If you're on Microsoft 365 Business Premium, it's already included at no extra cost, and its vulnerability management module gives you software inventory, patch status, and per-device vulnerability findings with remediation guidance for up to 300 users.
13. Microsoft 365 Business Premium mentioned
    If you're on Microsoft 365 Business Premium, it's already included at no extra cost, and its vulnerability management module gives you software inventory, patch status, and per-device vulnerability findings with remediation guidance for up to 300 users.
14. Greenbone Community Edition / OpenVAS mentioned
    Greenbone Community Edition / OpenVAS - The free, self-hosted option.
15. Nmap mentioned
    Nmap - Not a replacement for the above, but free, lightweight, and its NSE scripts do basic vulnerability checks.
16. Qualys VMDR mentioned
    Skip for now: Qualys VMDR and Rapid7 InsightVM.
17. Rapid7 mentioned
    Skip for now: Qualys VMDR and Rapid7 InsightVM.
18. Rapid7 InsightVM mentioned
    Skip for now: Qualys VMDR and Rapid7 InsightVM.

Sources the engine cited

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The answer, as recorded

## For most small businesses, in the order I'd actually try them **1. Intruder** - The default recommendation if you have a handful of internet-facing assets and no dedicated security person. It's SaaS, so nothing to host; it does continuous external attack-surface scanning and emails you when something new appears. Plans run roughly $99/mo (Essential), $180/mo (Cloud), $240/mo (Pro), with a free trial. Worth knowing what you're paying for: Essential runs OpenVAS under the hood, Cloud adds Nuclei, and Pro is where you get the Nessus engine - so the cheap tier is largely a managed wrapper around free tooling, which is fine if you value not running it yourself. **2. Tenable Nessus Professional** - The deepest, most credible scanner pedigree, and the one auditors and pentesters recognize. Unlimited assessments, CVSS v4, plus config/compliance audits (CIS benchmarks), which matters if you're chasing SOC 2 or cyber insurance requirements. List is $4,790/yr, dropping to ~$4,546/yr effective on a 3-year term. It's more hands-on - it scans, it doesn't manage the remediation workflow for you. **3. Microsoft Defender for Business** - Check this *before* buying anything. If you're on Microsoft 365 Business Premium, it's already included at no extra cost, and its vulnerability management module gives you software inventory, patch status, and per-device vulnerability findings with remediation guidance for up to 300 users. For a Windows-centric shop, this may cover your endpoint side entirely, leaving you to buy only external/network scanning. **4. ManageEngine Vulnerability Manager Plus** - Best pick if your real problem is that nobody patches things. It combines scanning with actual patch deployment in one workflow, which is a better fit than a pure scanner when you don't have staff to translate findings into action. There's a free tier for a small number of endpoints. **5. Greenbone Community Edition / OpenVAS** - The free, self-hosted option. Genuinely full-featured network scanning with severity scoring and remediation reports, no license cost. Only choose this if someone on your team is technical and willing to own the maintenance - the community feed is rate-limited and slower than commercial feeds, and the admin overhead is real. It's a false economy if it means scans quietly stop running. **6. Nmap** - Not a replacement for the above, but free, lightweight, and its NSE scripts do basic vulnerability checks. Useful as a first look at what's actually exposed on your network before you spend money. **Skip for now:** Qualys VMDR and Rapid7 InsightVM. Both are excellent but priced per asset for enterprise scale (~$17-33 and ~$25-35 per asset/year respectively) and assume a security team to operate them. Rapid7 undercuts at the mid-market end, so it becomes worth a look once you're past ~100 assets. **Practical shape of a good setup:** Defender for Business (already paid for) for endpoints + Intruder for anything internet-facing. That's under $1,500/yr for most small businesses and covers the two things attackers actually use. Sources: - [Best Vulnerability Scanners For Small Businesses In 2026 - Blue Headline](https://blueheadline.com/cybersecurity/best-vulnerability-scanners-small-business/) - [7 Best Vulnerability Scanning Tools & Software in 2026 - eSecurity Planet](https://www.esecurityplanet.com/networks/vulnerability-scanning-tools/) - [Intruder pricing 2025: Is it worth it? - Beagle Security](https://beaglesecurity.com/blog/article/intruder-pricing.html) - [Tenable vs Qualys vs Rapid7: best pick for 2026 - Luniq](https://www.luniq.io/en/resources/blog/qualys-vs-tenable-vs-rapid7-best-vulnerability-scanner-for-engineering-firms-in-2026) - [Tenable Alternatives (2026): 7 Vulnerability Scanners Compared - Secably](https://secably.com/blog/tenable-alternatives/) - [What is Microsoft Defender for Business? - Microsoft Learn](https://learn.microsoft.com/en-us/defender-business/mdb-overview) - [Microsoft Defender Suite for Microsoft 365 Business Premium - Microsoft](https://www.microsoft.com/en-us/security/small-medium-business/microsoft-defender-suite-business-premium) - [Nessus Alternatives 2026 - Ciphers Security](https://cipherssecurity.com/nessus-alternatives-2026/)

Near this answer

The same question, recorded on other dates: 2026-10-24, 2026-10-21, 2026-10-19, 2026-10-18, 2026-10-16, 2026-10-14, 2026-10-11, 2026-10-09, 2026-10-06, 2026-10-03, 2026-10-01, 2026-09-29.

vulnerability scanning tools, asked for other audiences: remote teams (asked 2026-10-24).

Other categories with a recorded answer: backup and recovery software, cloud hosting providers, compliance automation software, data loss prevention software.

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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.