What is that website built with? And what is missing?
Tools like Wappalyzer tell you what a site runs. For an agency the more valuable question is what it does not run. No chatbot, no CRM, no email platform, no booking tool means a business with an obvious problem you can solve. Paste a URL and read the stack and the gaps.
- Method
- Public markup fingerprinting
- Reads
- CMS, pixels, CRM, chat, booking, email
- Honesty
- "Not detected" never means "not present"
Stack + gaps report
Paste any URL. We read the public markup and report the detected tools and the prospecting gaps.
Paste a URL above to read the stack and the gaps. Detected tools are listed first, then the prospecting gaps.
Eight categories that map to services you sell
Each detected tool, and each one missing, is read from the page itself.
WordPress, Shopify, Webflow, Squarespace and more.
Storefront platforms and checkout providers.
GA4, Plausible and other measurement tools.
Meta, Google and other retargeting tags.
Live chat and helpdesk widgets, or their absence.
Embedded CRM and marketing automation forms.
Calendar and appointment scheduling tools.
Newsletter and email marketing platforms.
Paste. Fingerprint. Read the gaps.
No setup. Three steps from a plain URL to a prospect-ready gap report.
Paste a URL
Drop in any website. Nothing to install on the target site, no login, no probing. We read only what the page already serves to every visitor.
We fingerprint the stack
CMS, ecommerce, analytics, ad pixels, chat widgets, CRM, booking tools and email platform, all read from the public markup, headers and scripts.
Read the gap report
The report leads with what is missing, ranked by how obvious the pitch is. No chat widget, no CRM, no pixel: each gap maps to a service you sell.
Built for agencies prospecting for clients
The checker turns a website's public stack, and its gaps, into a qualified prospecting signal. These are the patterns agencies reach for most.
Qualify leads by stack
WordPress plus no CRM is an automation pitch waiting to happen. Sort prospects by the tools they run, and the tools they obviously do not, before you ever reach out.
Find users of a specific platform
Looking for Shopify, ClickFunnels or GoHighLevel users for a niche offer? Detect the platform first, then pitch the businesses already living in the tool you specialize in.
Spot missing ad pixels
No Meta pixel, no Google tag, no retargeting. Flag the businesses running ads with nothing measuring them before you pitch paid media management.
One-glance pre-call research
Pull a stack report before a discovery call and walk in knowing what they run, what they are missing, and which of your services fits. No guesswork on the call.
Segment scraped lead lists
Split a raw list of businesses by the technology each one runs. Pairs naturally with the Google Maps and social scrapers: scrape the list, then sort it by stack.
Competitive teardowns
Show a client exactly what their competitors run and where their own stack falls short. A clean technology breakdown makes reporting and upsells concrete.
See the stack, then grade the funnel
The technology checker reads what a site runs. The 12-point audit scorecard grades whether that site can actually capture and follow up with a lead.
Frequently asked questions
How does technology detection work?
Every page a website serves carries fingerprints of the tools behind it: meta generator tags, script URLs, cookie names, response headers and characteristic file paths. We read those publicly served signals and match them to known platforms, the same information any visitor receives.
How is this different from Wappalyzer or BuiltWith?
Wappalyzer and BuiltWith are excellent at listing what a site runs, and we are not pretending otherwise. The difference is the angle: this checker is built around what is absent, and it scores those gaps for agency prospecting. The missing CRM, the missing pixel, the missing chat widget are the pitch, so we lead with them.
How accurate is detection?
Accuracy is high for client-side tools, the ones whose code is served to the browser, because their fingerprints are right there in the page. Server-side, custom or heavily proxied stacks can hide, and in those cases we report "not detected" rather than guessing. We would rather be honest than overclaim.
Is it free, and do you store anything?
Yes, the checker is free, and there is no account. We fetch the public markup, match it against a self-hosted fingerprint database, and return the result. Results are briefly cached to keep the tool fast and cheap, and the scan reads public pages only.
How does this fit with the website audit scorecard?
The technology checker reads the stack a site runs; the 12-point audit scorecard grades whether that site can actually capture and follow up with a lead. Run the checker to see what is installed, then run the scorecard to grade the conversion layer around it.
The rest of the audit stack
Free tools that pair well with the scorecard, from list building to list cleaning. For the full picture, see the agency audit stack roundup.