The question usually arrives from an agency that has specialised. "We only take WordPress work. Can you find me businesses using WordPress?" Or the reverse: a designer who rebuilds do-it-yourself sites wants a list of every business whose website was made on Wix or Squarespace, on the theory that those owners have outgrown the tool. Either way, the instinct is the same. If you can see the platform from the outside, you can stop pitching people you cannot help.
The short answer is yes, mostly. The platform a website is built on is usually detectable from its public code, and there are free tools that will name it in seconds. The longer answer is that platform is a weaker prospecting signal than it looks. It tells you a fair amount about how a site was built and almost nothing about whether the owner wants it rebuilt, and a filter built on it alone tends to cut the list in the wrong places.
This article covers what you can genuinely detect, how reliable each read is, what the platform actually says about the business behind it, and how a web design or SEO agency should use it: as a way to exclude and to shape the conversation, stacked on top of signals that mean something, rather than as the list itself.
Yes, you can usually tell what a website is built on
Website platforms leave fingerprints. They load their files from recognisable paths and hostnames, they add characteristic markup, and many of them announce themselves in a "generator" tag in the page's source. You do not need special access to read any of it; it is the same public code your browser downloads to show the page.
There are three practical ways to read those fingerprints, and they scale very differently.
Look at the source yourself
Open a page, view its source, and search for the obvious markers. A WordPress site typically loads files from folders named wp-content and wp-includes. Shopify stores pull assets from a Shopify-hosted content network. Wix, Squarespace and Webflow sites load from their own platform hostnames and usually say so in a generator tag or a code comment. This costs nothing and teaches you what the tools are looking at, which matters when they disagree. It does not scale past a handful of sites.
Use a lookup tool or browser extension
Technology-detection services such as BuiltWith and Wappalyzer do the same pattern-matching automatically and return a breakdown: content management system, ecommerce platform, page builder, analytics, hosting, and more. The free versions are built for checking one site at a time. They are excellent for qualifying a prospect you are already looking at, and for confirming a guess before you mention anything in a message.
Run detection in bulk
The same services sell list access and APIs, and developers write their own detectors against a spreadsheet of domains. This is the version people imagine when they say "find me every business on WordPress," and it is the one where the limits below start to bite, because nobody is looking at the edge cases one at a time anymore.
Where detection goes wrong
Detection is pattern-matching, and patterns can be hidden, borrowed or missing. Before you build a campaign on it, know the five ways a read comes back wrong.
- Hidden signatures. Security plugins and careful developers strip the generator tag and rename folders. A professionally maintained WordPress site can read as "unknown," which means the best-run sites on the platform are the ones most likely to drop out of your list.
- Headless and hybrid builds. A site whose content lives in one system and whose front end is built in another may show the front-end framework and hide the content system completely.
- Several platforms on one domain. A home page on a site builder, a shop on Shopify, a blog on WordPress in a subfolder. Tools report what they find on the URL you gave them, which may not be where the business actually lives.
- The website is not the website. Many small businesses point their domain at a booking page, a directory profile or a social page. Detection will happily report the booking platform's technology, which tells you nothing about a rebuild.
- Stale records. Bulk databases are crawled on a cycle. A business that rebuilt last month may still be listed on the old platform, and that is the one prospect you least want to call about a redesign.
None of this makes detection useless. It means a platform label should be treated as a probability with a known error pattern, and confirmed on any prospect before you say it out loud.
What the platform tells you about the business behind it
This is where most platform-based prospecting goes wrong. A platform is a record of a past decision: who built the site, how, and with what budget at the time. It is a reasonable proxy for some things and silent on the ones that decide whether you get a meeting.
| What you see | What it usually suggests | What it cannot tell you | The conversation it implies |
|---|---|---|---|
| A hosted site builder (Wix, Squarespace, GoDaddy's builder) | The owner or someone close to them probably built it; low past spend on the site; the owner can edit it themselves | Whether they are proud of it, embarrassed by it, or never think about it | Outgrowing the tool: what it now costs them in leads, speed or search visibility |
| WordPress | Anything from a ten-year-old theme to a custom agency build; someone may already maintain it | Whether there is an agency of record, and how old or healthy the install is | Rescue, maintenance or redesign on the same platform, or a rebuild if it is badly neglected |
| Shopify or another ecommerce platform | Online sales matter to the business; there is recurring spend on apps and the store | Revenue, margin, or whether they want services beyond the store | Conversion and store performance rather than "a new website" |
| Webflow or a modern custom build | Recent, deliberate investment, often by a designer | Whether that designer is still involved | Usually none about a rebuild; sometimes SEO or content |
| No detectable site, or a booking or social page instead | The business has never invested in a site, or has given up on one | Whether that is a choice or a gap they would pay to close | A first site, which is a different sale with a different buyer mood |
Read the "cannot tell you" column carefully, because it contains everything that predicts a sale. Platform does not tell you whether the owner is unhappy, whether they have budget now, whether they are the person who decides, or whether a nephew or an agency is already attached to the site. Those are the facts a meeting turns on, and you will need other signals to get at them.
Three ways a platform-specialist agency actually uses it
When a WordPress-only agency asks for "businesses using WordPress," it is usually asking for one of three different things, and they produce different lists.
Same-platform work: rescue, maintenance, redesign
If what you sell is care for existing sites on your platform (updates, security, speed, a redesign that keeps the content system), then a platform match is genuinely a requirement, and detection is the right first filter. The catch is pool size. WordPress is the most widely used content management system on the web, so "uses WordPress" barely narrows a local business list; you will still need signals that separate a neglected install from one an agency maintains carefully. A plain platform match is the start of the filter, not the end of it.
Migration in: from a site builder to your platform
Here is the irony. A WordPress agency whose real growth market is owners who have outgrown a site builder should be excluding WordPress sites and targeting Wix and Squarespace ones. Filtering for your own platform removes precisely the buyers whose pain your platform solves. Decide which business you are in before you set the filter, because the two lists barely overlap.
Exclusion: platforms you cannot or will not touch
The quietest and most reliable use is negative. If you do not work on Shopify, remove Shopify stores. If you will not inherit someone else's custom build, remove those. Exclusion uses detection where it is strongest, on clear positive matches, and avoids relying on it where it is weakest, on sites that hide their signature. An exclusion list rarely costs you a good prospect; an inclusion list built on detection quietly drops the best-maintained sites on your platform.
Stack platform with signals that actually mean something
A platform match becomes useful when it sits under other evidence. The combinations below are the ones worth building, because each pairs "what kind of job" with "is there a reason to call now."
- Platform plus visible age. An old theme, a footer copyright several years out of date, or a design that predates phones. On a site builder, this is the owner who built it once and stopped. On WordPress, it often means nobody is maintaining the install.
- Platform plus a functional defect. A form that errors, a page that fails on mobile, no way to book or call from the first screen. Defects are observable, specific, and make an opener that does not sound like a template, which is the whole argument of how to get web design clients by referencing something real.
- Platform plus a reputation mismatch. A business with a strong Google rating and many reviews behind a site that undersells it has customers and a reason to care. The reverse pattern, covered in finding reputation management clients, is a different offer.
- Platform plus proof of spend. A site-builder business that is already running paid ads is sending paid traffic to a page it built itself. That is the clearest version of "this site is costing you money" available from outside.
- Platform plus industry. Industry decides whether the business can afford you; platform decides what the job looks like. Combining them lets you say something specific to, say, a dental practice on a builder template, rather than to "a business with a website."
Every one of these filters shrinks the pool, and a local market only holds so many businesses in a niche. Before you stack four of them, it is worth a pass through which qualifying filters are worth what they cost, and a rough count of how many businesses you can actually reach.
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Once you know a prospect built their site on Wix, it is tempting to lead with it. "I noticed your site is on Wix" feels like personalisation. To the owner who built it themselves, on a weekend, it reads as two things at once: that a stranger has been examining their business, and that the thing they made is being judged by the tool they used. Neither starts a conversation.
Lead with the consequence instead, the thing a customer would notice. "Your booking form throws an error on a phone" or "your homepage doesn't show your phone number until halfway down" is specific, checkable and about their customers rather than their technology. If they reply, the platform becomes useful in the second message, where it lets you be concrete about the fix: "On Wix that's a template limitation; on a rebuild we'd fix it like this." At that point it signals expertise rather than surveillance.
The same rule applies when an AI drafts the opener. Detail that is true and relevant to the reader lands; detail that only proves you looked tends to make the message feel processed, which is the failure mode described in signs your outreach looks automated. If you are personalising at volume, how AI personalisation actually works covers which details survive the trip from data to message.
How the second message changes by platform
- Site builder, owner-built. Respect the effort, name what the tool now limits, and keep the next step small. The buyer's worry is losing control of something they can currently edit themselves, so say early whether they will still be able to.
- WordPress, possibly maintained. Ask before assuming. "Is someone looking after the site at the moment?" both qualifies and avoids insulting a colleague's work in front of their client.
- Ecommerce. Talk about the store's job, not its looks: checkout, speed, product pages, search. "New website" is the wrong noun for a store owner.
Doing it at list scale without losing a week
The expensive mistake is the order of operations. Agencies start with a bulk platform list ("every WordPress site in my state"), then try to find out who each business is, whether it is in a niche they serve, and how to reach the owner. Most of the list fails at the second or third step, and the platform data you paid for is spent on businesses you were never going to contact.
Reverse it. Build the pool from business data first: the industries you serve, the places you sell into, and a reachable decision-maker. Then run the platform and defect checks only on that pool, as a scoring layer. You check far fewer sites, and every one you check is a business you could actually message. This is the same reason ad-spend checks work better on a pool than as a pool, and it is how a list stays fresh rather than becoming a stale export.
Reachability deserves its own line. A beautiful platform-qualified list of businesses with only a generic info@ address or an office landline will produce very few conversations with owners. When TaskBlink builds a list, it starts from real-time business data and Google Business Profile signals for the client's ideal customer and validates that every phone number is a real working cell before any outreach goes out, because a qualified business you cannot reach is not a prospect. If you are doing this yourself, check reach before you spend time on qualification, not after.
Finally, keep the read honest when you use it. Confirm the platform on any prospect before you reference it, re-check anything older than a few months, and treat "unknown" as unknown rather than as a no.
When platform is the wrong filter
There are situations where the platform read should be ignored entirely.
- Your offer is not platform-specific. If you sell SEO, paid search or lead generation, the platform matters only as a technical footnote. Filtering on it cuts your pool for no reason. Build your SEO or marketing list on industry, geography and visible need instead.
- The business has no real site. For a web designer, these are often the most motivated buyers of all, and a platform filter excludes them by construction. Treat "no site" as its own segment with its own opener.
- The site belongs to someone else. Franchise locations and members of large brokerages or networks often have pages on a parent-company platform they cannot change. The platform is real; the local owner's authority over it is not.
- You are early and still finding proof. Until you have results to show, speed to a first client matters more than a perfect match. If you are deciding how narrow to go, whether to niche down is a better question to answer first, and platform is a poor stand-in for a niche.
The short version
You can find businesses by the platform their website runs on, and the free tools are good enough to qualify any single prospect. At list scale, detection misses the best-maintained sites and lags behind rebuilds, so it works best as an exclusion filter and a conversation-shaping detail rather than as the list itself. Decide whether you sell same-platform work or migrations before you filter, because the two lists point in opposite directions. Stack platform with signals that show a problem and a reason to call now. Build the reachable pool first, check platform on that pool, and never open a cold message by naming the tool the owner used. For a web design agency, that is the difference between a clever list and a full pipeline.
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See your list →Frequently asked questions
How can I tell if a business's website is built on WordPress?
Check the page source for files loading from folders named wp-content or wp-includes, or run the address through a free detection tool such as BuiltWith or Wappalyzer. Some well-maintained WordPress sites hide these signatures, so an "unknown" result does not mean the site is not WordPress.
Can I get a list of every business in my area using Wix or Squarespace?
Technology-detection services sell bulk lists by platform, but they are built from periodic crawls, miss sites that hide their signature, and say nothing about whether a business is in your niche or reachable. Building a pool from business data first and checking platform on that pool is usually faster and wastes less.
Is a business on a site builder a good web design prospect?
Sometimes. A site builder suggests the owner built the site and spent little on it, which can mean they have outgrown it or simply that they are content with it. Pair the platform with a visible defect, an out-of-date design, or proof they spend on marketing before treating it as a reason to reach out.
Should I mention a prospect's website platform in a cold message?
Not in the first message. Naming the tool can read as judging the owner's work and as evidence you were examining their business. Lead with a specific consequence their customers would notice, and bring the platform in after they reply, when it helps explain the fix.