Vulnerability scanners for small business, compared

Vulnerability scanners for small business: seven options compared

The table lists one entry-level offer from each option: the lowest-priced plan we could find published on the vendor’s own page. Security Ready, the service we operate, is one row among the others.

Prices and limits are as published on each vendor’s official page on 11 November 2026, in the currency shown there. They exclude taxes, change often and may differ by country. The pages we read are listed under Sources at the bottom. Product names are trademarks of their owners and are used here only to identify the products.

Hosted vulnerability scanning services: when they are the right choice

A hosted service scans from the vendor’s systems on a schedule. You give it your addresses, and results arrive in a dashboard or by email.

Where the others are stronger than Security Ready: testing behind a login, API testing, cloud-account checks, integrations with other tools, and human-led testing. If you need any of those, choose a service that lists it.

Which scanners can check inside your servers and PCs (internal scanning)?

An outside scan sees what an attacker on the internet sees. It cannot see missing updates or risky settings inside a machine. Some services add an internal scan for that, usually on a higher plan. Here is what each vendor's own page showed on 11 November 2026.

The methods differ, so compare what you need rather than the label. Network-based internal scanning (Tenable Nessus, and services that offer internal network scans) can sweep every device connected to an office network, including printers and network equipment. Security Ready does not scan a network: it checks only the machines where you run its program, listing installed software and update status, checking settings, and looking for signs of compromise (counts and locations only).

If you need every device on an internal network scanned, choose a tool built for that. If you need to know whether a handful of servers, PCs and WordPress sites are missing updates, a per-machine check is enough and costs less.

A scanner licence or a free open-source tool: cheap if you have the skills

Tenable Nessus is a scanner you install and run yourself. One licence of Nessus Professional is listed at $4,790 for a year and is not priced per server, so the cost per machine falls as you scan more. Tenable maintains its own library of checks and research. Nessus Essentials is free, but Tenable’s page limits it to 5 IPs and to non-commercial use, so it is for learning, not for a business.

ZAP is a free, open-source tool for testing web applications. It sits between your browser and your site and can send test attacks. It does not scan servers or networks, and you need to host, schedule and interpret it yourself.

Only scan systems you own or have written permission to test. ZAP’s own guide warns that its active attacks can damage a site’s functions or data. Try it on a test copy first.

The real cost of these two is time: setting up, keeping the tool updated, and sorting a long technical output into what matters.

Website clean-up and firewall services: a different job

Sucuri is not a server vulnerability scanner. Its platform watches a website for malware, blocklisting and unwanted changes, puts a firewall in front of the site, and removes malware by hand when a site is infected. Its page lists unlimited manual clean-ups on every platform plan.

Choose this kind of service when your site has already been hacked, or when you want a firewall and someone to call. Security Ready does not remove malware or restore hacked sites. For WordPress sites, see our guide to checking WordPress for vulnerabilities.

How to choose a vulnerability scanner in 5 questions

1. 1

   What do I need checked?

   Write a list: website addresses, servers, office PCs, cloud accounts, and any application with a login. Cross off every option in the table that does not cover your list.

2. 2

   Who will read the results?

   If that person is not a specialist, ask for a sample report before paying and check that it says what to do, not only what was found. If the terms are new, read what a vulnerability scan is first.

3. 3

   What will my setup actually cost?

   Count your targets and price each option for that number over a year. For three servers, a $39 plan that covers five targets and a plan at $19 plus $9 for each extra server cost about the same.

4. 4

   How often is it scanned?

   Entry plans often limit frequency, for example to a few scans a month. Check the limit on the pricing page, and ask whether newly published vulnerabilities trigger an alert between scans.

5. 5

   Can I try it on my own site first?

   Use the free plan, trial or free first scan on one real server. Judge the result by one thing: could you fix the top three findings from what it told you?

What no vulnerability scanner replaces

Every option on this page is software running a list of checks. Software does not notice that a customer can change a price in the basket, or see another customer’s order. Finding that takes a person testing by hand. If you handle payments or personal data behind a login, or a contract asks for it, budget for a penetration test as well. Our guide to vulnerability scan and penetration test costs gives typical prices.

A clean scan is not a guarantee of safety. It means nothing was found within the scope, by those checks, on that day.

Where Security Ready is not a fit

• You need deep testing behind a login, API testing or checks of business logic. Security Ready does not do these.
• You need a person to test your systems. We do not offer penetration testing.
• Your site is already infected. We do not remove malware or restore hacked sites.
• You need a vendor based in the United States or Europe, with support in your time zone, or one that holds a specific security certification or compliance report. We operate from Japan; ask each vendor what it holds.
• You need every device on an office network scanned, including printers and network equipment. Our internal scan covers only the machines where you run its program.
• You want to connect the scanner to many other tools. Other services list far more integrations.

Where it does fit: a company website, WordPress and a few servers, looked after by someone who is not a security specialist, or a web agency watching client sites. You can try it with a free first scan of one server.