Look up any website's technology stack for free — then build lead lists combining as many technologies as you want. One plan. Credits that never expire.
Enter any domain. We fetch the site live and fingerprint its stack — no signup, no card.
Pick up to three technologies here (the product itself has no combination cap), and optionally narrow by SEO and marketing signals. You see the match count and first results free — exporting asks for an email, free exports are capped, and the full list unlocks on Pro. Counts come from our starter index of 14,305 fingerprinted websites, sampled from the Tranco top sites — growing daily. Marketing data (from public GTM containers) currently covers 3,301 sites.
Funnel types are classified from the event names each site's public GTM container publishes — a heuristic from public data, not the site's internal funnel.
Combine as many technologies as your targeting needs, then narrow the list by SEO and marketing signals. Build the list, see the count, export it.
Every indexed site carries its schema types, canonical and hreflang setup, meta robots and the SEO plugin it runs — so an agency can find, say, WordPress sites missing Product schema.
A site's Google Tag Manager container is a public file its own visitors download. We read the setup it publishes there — Google Ads conversions, funnel event names, analytics ids and ad pixels — and make it filterable. We also classify each site's funnel type (ecommerce, lead-gen / demo, or content-only) from those published event names.
Public DNS records reveal each domain's email stack — Google Workspace, Microsoft 365, Mimecast, Proofpoint and more — plus SPF presence and DMARC policy. Filter lists by email provider, or find every site in a stack with no DMARC record.
Full CSV exports of every list you build, and credits that never expire — use them when you need them, not before a 60-day deadline takes them away.
| StackScope Pro | BuiltWith Basic | Wappalyzer (entry) | |
|---|---|---|---|
| Price | $99/mo | $295/mo (was $199) | $250/mo (was $149) |
| Technologies per list | Uncapped | Capped at 2 | Capped at 2 |
| Credits | Never expire | Plan allowances | Expire after 60 days |
| CSV export | Included | Included | Included |
Prices in USD. Cancel anytime. Validation preview: the index currently covers 14,305 websites. Subscribing supports the build-out and locks in the $99 launch price.
Yes. Single-site lookups are free with no account and no card — enter a domain and we fetch and fingerprint the site live. The list builder is free to run too: you see the match count and the first results before anything asks for an email.
Exporting a list to CSV asks for an email, and free exports are capped at the first matches. Pro unlocks the full export of every list you build. That's the whole gate — no account is needed to look sites up or to test the builder.
Never. Wappalyzer's included API credits expire after 60 days (their pricing page says so); ours stay in your account until you use them.
Price and caps. BuiltWith Basic is $295/mo and caps list building at 2 technologies; Wappalyzer's $250/mo entry plan slices a single technology and reaches unlimited combinations only at $450/mo. StackScope Pro is $99/mo with no combination cap — and adds two signal layers neither leads with: per-site SEO signals, and marketing signals read from each site's public GTM container.
Public web pages, fingerprinted with the open web-technologies dataset maintained by HTTP Archive; the starter index samples the Tranco top-sites list and grows daily. Marketing signals come from the Google Tag Manager container file each site publishes to every visitor. Conversion values are shown only where a container publishes a static value — most set values at runtime, and we never estimate them.
Yes. Pro is a plain monthly subscription — cancel whenever you like and you keep access until the end of the paid month.
Join the founding list — one email when the full index launches, no spam.