Whether you're reverse-engineering a competitor, hunting for a web agency to hire, or just satisfying your curiosity, this guide covers every reliable method to find out who designed, built, created, or developed any website — from a one-click tool to deeper manual techniques.
The fastest method is to run the domain through a free tech stack checker — it instantly reveals the CMS, theme, framework, and hosting provider, which together fingerprint the builder. For a human name or agency, also check the page footer and run a WHOIS lookup on the domain.
People ask this question for a handful of concrete reasons — and the best method to use depends on which one applies to you.
Competitor research. Knowing that a rival is running on Webflow rather than a custom React build tells you their development budget, their time-to-publish speed, and the design constraints they're working within.
Hiring or agency sourcing. You found a website that looks exactly like what you want. Finding out who designed it is the fastest route to hiring the right studio or freelancer.
Migration planning. Before moving your own site to a new platform, checking what stack high-performing sites in your niche use helps you make an informed choice.
Sales prospecting. Web agencies and SaaS vendors often want to know whether a prospect's site is on a platform they can integrate with, migrate away from, or sell adjacent services to.
Security research. Knowing the underlying CMS version or JavaScript framework helps developers and security teams identify vulnerable stacks in their own portfolio or in sites they're auditing.
Reading publicly visible page source code, HTTP response headers, and meta tags on a site you can access normally is entirely legal — no hacking, credential use, or data scraping of private data is involved.
A dedicated tech stack detection tool is the single most reliable method because it analyses dozens of signals simultaneously — HTTP headers, cookie names, JavaScript globals, meta tags, DNS records, and CDN fingerprints — in under five seconds.
It answers not just "who built this?" but "what are they running, who hosts it, what analytics are they using, and what CDN serves their assets?" — a full intelligence picture in one click.
Paste any domain and get the full technology fingerprint — CMS, framework, CDN, analytics, and more — in seconds. No sign-up required.
Run a free tech stack scan →Each detected technology is categorised and explained, giving you context rather than just a list of names.
| Signal type | What it tells you | Example output |
|---|---|---|
| CMS / Builder | The platform the site was built and published on | WordPress 6.5, Webflow, Shopify |
| Theme / Template | The visual framework and sometimes the designer who made it | Divi, Kadence, Flatsome |
| JavaScript framework | The frontend stack, pointing to the dev's skill set | React, Next.js, Vue, Alpine.js |
| Hosting / CDN | Where the site lives and how it's delivered | Cloudflare, Vercel, WP Engine |
| Analytics | What measurement tools the team uses | GA4, Plausible, Mixpanel |
| Marketing stack | CRM, email, chatbot integrations | HubSpot, Intercom, Klaviyo |
If the stack checker returns a premium theme like "Avada" or a niche Shopify theme like "Prestige", searching that theme name on Behance, Dribbble, or the theme author's partner page surfaces the designer or agency who customised it.
Inspecting page source is the manual version of what a tech stack tool does automatically — it takes longer but teaches you to read the signals yourself.
In any browser, navigate to the site and press Ctrl + U on Windows or Cmd + Option + U on Mac. Alternatively, right-click any blank area of the page and select View Page Source.
Press Ctrl + F and search for generator. The generator meta tag — when present — directly names the platform. WordPress inserts <meta name="generator" content="WordPress 6.x">. Drupal, Joomla, and many page builders do the same.
Search for wp-content (WordPress), shopify (Shopify), wixsite (Wix), webflow (Webflow), or squarespace (Squarespace) — these strings appear in asset URLs and script paths and survive even when the generator tag is removed.
Security-conscious WordPress installs and professionally configured sites frequently remove the generator tag with a single line of code. Absence of the tag does not confirm a custom build — use a tech stack checker to look at all signals simultaneously.
A WHOIS lookup queries the public registry record for a domain, which can expose the registrant name, registration date, name servers, and hosting provider — sometimes pointing directly to the developer or agency that set up the account.
Go to who.is, lookup.icann.org, or type whois domain.com in your terminal. Enter the domain without the https:// prefix.
The registrant field shows who registered the domain — sometimes this is the agency that set up the site for the client, especially on older registrations made before GDPR/CCPA privacy shields became standard. The name servers point to the DNS provider and often the hosting platform (e.g., ns1.cloudflare.com = Cloudflare, ns.vercel-dns.com = Vercel).
Limitation: Since GDPR came into effect in 2018, most registrars in Europe and many globally now redact personal registrant data behind privacy proxy services, so the registrant field often returns "Redacted for Privacy" rather than a person's name.
Once you have a company name, CMS, or agency name from the methods above, LinkedIn and portfolio platforms let you find the specific humans who built the site.
Employees often list the companies they built sites for in their experience or featured sections. Searching "[Company Name]" web designer or "[Company Name]" Webflow developer on LinkedIn surfaces past and current contractors and employees.
Designers frequently publish the finished site in their portfolio. Searching the company or brand name on Behance, Dribbble, or Awwwards can directly surface the original design submission along with the studio credit.
Early archived versions of a site at web.archive.org often still contain footer credits, generator tags, and uncleaned asset paths that were later removed — especially useful for custom builds where all traces have since been erased.
Each major platform leaves distinctive traces in the HTML, asset paths, and cookie names — once you learn these, you can identify the builder with a 10-second manual inspection.
Each method has a different cost in terms of time, skill, and the specificity of what it reveals — use this table to pick the right one for your goal.
| Method | Speed | Cost | Reveals platform? | Reveals human/agency? | Skill required |
|---|---|---|---|---|---|
| Tech stack checker | Seconds | Free | ✓ Always | ✓ Via theme/agency | None |
| Footer inspection | Seconds | Free | ✓ Sometimes | ✓ Sometimes | None |
| Page source / DevTools | 2–5 min | Free | ✓ Usually | ✗ Rarely | Basic |
| WHOIS lookup | 1–2 min | Free | ✓ Via nameservers | ✓ Pre-GDPR sites | Low |
| LinkedIn / portfolio | 10–30 min | Free | ✗ Indirect | ✓ Best for this | Low |
| Wayback Machine | 5–15 min | Free | ✓ Historical | ✓ Old credits | Low |
Custom-built sites — those hand-coded in frameworks like Next.js, Nuxt, SvelteKit, or plain HTML/CSS — are the hardest to attribute because they deliberately leave no platform fingerprint.
If the tech stack checker returns no recognised CMS but identifies React, Vue, or Angular as the frontend framework, alongside a cloud provider like Vercel, Netlify, or AWS, the site was almost certainly built by an in-house developer or specialist agency rather than a platform builder.
GitHub. Some companies host their frontend in a public GitHub repository — search the company name on GitHub and look for a repository named after the site or the company's main product.
Code comments. Custom builds sometimes contain developer email addresses, GitHub usernames, or agency names in HTML comments or JavaScript source files — search the page source for <!-- and read any comments present.
Open Graph and Twitter card credits. Some developers include their studio's Twitter handle in the twitter:site or og:site_name tags as a form of quiet attribution.
SSL certificate. The organisation field of the SSL certificate occasionally names the agency that set up TLS — check via your browser's padlock icon → Certificate → Details.
Once you know who built a site, check whether AI systems like ChatGPT, Google AI, and Meta AI actually know about that brand — and what they're saying about it.
Check AI brand awareness → Tech stack checkermysite.webflow.io or mysite.myshopify.com on unmasked subdomains), but a custom domain gives nothing away. A WHOIS lookup on that domain and a tech stack scan are the next steps.Identify the full technology stack in seconds, or check whether AI systems recognise the brand behind it.
Tech stack checker → AI brand awareness check →