What Claude (Anthropic) with web search answered for vulnerability scanning tools (small businesses) on 2026-10-14

Claude (Anthropic) with web search claude-opus-5 asked 2026-10-14

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 - My default recommendation for most small businesses.
2. Tenable recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
3. Tenable Nessus recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
4. Tenable Nessus Essentials recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
5. Nessus Essentials recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
6. Nessus Professional recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
7. Professional recommended
   Tenable Nessus Essentials (free) → Nessus Professional - Nessus is the industry-standard scanner with the deepest vulnerability check library.
8. Astra recommended
   (Astra (https://www.getastra.com/blog/dast/vulnerability-scanning-for-smbs/), G2 (https://www.g2.com/compare/qualys-was-vs-tenable-nessus))
9. Astra Security recommended
   Astra Security - Worth a look specifically if you need a compliance report (SOC 2, ISO 27001, PCI) to hand a customer or auditor.
10. Snyk recommended
    Snyk - Different category, but if you ship software, add this rather than substituting it.
11. OpenVAS / Greenbone recommended
    OpenVAS / Greenbone - The free open-source option.
12. Linux recommended
    I'd only pick this over Nessus Essentials if you have more than 16 IPs and someone who enjoys Linux administration.
13. Qualys VMDR mentioned
    Who I'd skip: Qualys VMDR and Tenable Security Center.

Sources the engine cited

The answer, as recorded

Here's what I'd actually recommend, roughly in the order I'd suggest you look at them: **1. Intruder** - My default recommendation for most small businesses. It's built for exactly your situation: cloud-based, no appliance to run, continuous external scanning with alerts when a new critical CVE affects something you own. It's the only major player in this space where small business is the *primary* customer base (~59% of its reviews), not an afterthought, and it has the highest satisfaction rating of the commercial options at 4.8/5. Starts around $149/month. ([intruder.io](https://www.intruder.io/blog/the-top-vulnerability-scanning-tools), [G2 comparison](https://www.g2.com/compare/intruder-vs-qualys-vmdr)) **2. Tenable Nessus Essentials (free) → Nessus Professional** - Nessus is the industry-standard scanner with the deepest vulnerability check library. Essentials is free for up to 16 IPs, which genuinely covers a lot of small offices, and it's the fastest way to get real data without spending anything. The upgrade to Pro is ~$3,390/year, which is where it gets expensive for a small shop - but you'll know by then whether you need it. Caveat: it's a tool, not a service. You get a long list of findings and no help prioritizing them. ([Astra](https://www.getastra.com/blog/dast/vulnerability-scanning-for-smbs/), [G2](https://www.g2.com/compare/qualys-was-vs-tenable-nessus)) **3. Astra Security** - Worth a look specifically if you need a compliance report (SOC 2, ISO 27001, PCI) to hand a customer or auditor. They pair automated scanning with human-assisted pentesting, which is the gap most pure-SaaS scanners leave open. Good fit when you have no security person on staff and need someone to interpret results. ([Astra](https://www.getastra.com/blog/dast/vulnerability-scanning-for-smbs/)) **4. Snyk** - Different category, but if you ship software, add this rather than substituting it. It scans your dependencies and code for known vulnerabilities and opens auto-fix PRs. Free tier is generous. Network scanners won't catch a vulnerable npm package; Snyk will. **5. OpenVAS / Greenbone** - The free open-source option. Genuinely capable, but budget real time for setup and tuning. I'd only pick this over Nessus Essentials if you have more than 16 IPs and someone who enjoys Linux administration. ([eSecurity Planet](https://www.esecurityplanet.com/networks/smb-vulnerability-scanner/)) **Who I'd skip:** Qualys VMDR and Tenable Security Center. Both are excellent enterprise platforms, both won't publish pricing, and both assume you have a dedicated security team to operate them. You'd be buying complexity you can't use. **One practical note:** whatever you choose, the scanner is the cheap part. The thing that actually reduces your risk is having a person who looks at the output every week and patches things. If nobody owns that, buy a managed service (Astra, or an MSP) instead of a tool. Sources: - [Intruder - top vulnerability scanning tools](https://www.intruder.io/blog/the-top-vulnerability-scanning-tools) - [Astra - vulnerability scanning for SMBs](https://www.getastra.com/blog/dast/vulnerability-scanning-for-smbs/) - [G2 - Intruder vs Qualys VMDR](https://www.g2.com/compare/intruder-vs-qualys-vmdr) - [G2 - Qualys WAS vs Tenable Nessus vs Intruder](https://www.g2.com/compare/qualys-was-vs-tenable-nessus-vs-intruder) - [eSecurity Planet - best SMB vulnerability scanning tools](https://www.esecurityplanet.com/networks/smb-vulnerability-scanner/) - [G2 - vulnerability scanners for small business](https://www.g2.com/categories/vulnerability-scanner/small-business)

Near this answer

The same question, recorded on other dates: 2026-10-11, 2026-10-09, 2026-10-06, 2026-10-03, 2026-10-01, 2026-09-29, 2026-09-27, 2026-09-25, 2026-09-23, 2026-09-21, 2026-09-16.

vulnerability scanning tools, asked for other audiences: remote teams (asked 2026-10-14).

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

Markdown edition · JSON record · the question page, with every recording · Answer Watch · 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.