VendorStacks vs BuiltWith
Same structural limit as any fingerprinting approach: it sees the browser-visible stack. We read the disclosed vendor list, which is where the back-end sits.
Side by side
| VendorStacks | BuiltWith | |
|---|---|---|
| What it is | A vendor-stack and subprocessor-disclosure API: give it a domain and it returns the vendors that company publicly discloses; give it a vendor and it returns the companies that disclose it. | Website technology profiler and lead-list tool: look up one site's stack, or list the sites using a given technology. |
| Data source | Parses what companies publish about themselves — subprocessor lists, DPAs and vendor disclosures — and returns the quoted source row behind every match. | Crawling and fingerprinting of public web pages. BuiltWith does not publish a detailed methodology page, so the specifics beyond that are not verifiable.source |
| Pricing | 1 credit per lookup, flat. Packs at $10 / $50 / $250. 25 free credits on signup, 5 free live scans a day, no annual contract and no sales call. | Published and self-serve; all plans cancel anytime, annual is a discount not a requirement.
|
| API access | Public REST API, self-serve key at signup, plus bulk endpoints and completion webhooks. | A large separate API product line — Domain, Lists, Relationships, Live Feed and more — with two endpoints marked free. How API quota maps to the plan tiers is not published.source |
When BuiltWith is the better choice
Historical depth and breadth on front-end technology, and relationship data across sites. Their index goes back years, which ours does not.
When VendorStacks is
When the vendor you care about is behind the product rather than in front of it, and when you need the evidence rather than a confidence score. Every match we return carries the sentence the company published, so it can be checked rather than trusted. And when you want to try it without a call: 25 free credits at signup, $10 for 1,100 lookups after that.
curl "https://api.vendorstacks.com/v1/check?url=stripe.com" \ -H "Authorization: Bearer vr_live_…"
Facts about BuiltWith are quoted from their own public pages, linked above, and were last checked on 2026-08-09. Nothing here is estimated: where BuiltWith does not publish something, this page says so. If a detail is out of date, tell us and we will correct it.