VendorStacks vs TheirStack
Job postings describe what a company is hiring for; subprocessor disclosures describe what it has contracted. A company that adopted a vendor two years ago and is not currently hiring is invisible to posting-derived data and present in ours.
Side by side
| VendorStacks | TheirStack | |
|---|---|---|
| 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. | B2B intelligence platform that finds companies by the technologies they use, derived from hiring signals, with buying-intent data alongside. |
| Data source | Parses what companies publish about themselves — subprocessor lists, DPAs and vendor disclosures — and returns the quoted source row behind every match. | Job-posting mining. Tech is detected from a posting's title, description or ATS URL, scored by mention frequency and recency. They state the limitation plainly: a company that uses a technology without mentioning it in postings — or that is not hiring — will not appear under it.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, cancel anytime, no annual commitment.
|
| API access | Public REST API, self-serve key at signup, plus bulk endpoints and completion webhooks. | Public REST API included in every API plan, with an MCP server and webhooks.source |
When TheirStack is the better choice
Hiring and buying-intent signals. If the question is which companies are actively staffing up around a technology, job postings are the right source and we do not collect them at all.
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.
What TheirStack claims about coverage
- Claims tech-stack data for 13M companies across 195 countries and 33k technologies.source
Reported as TheirStack's own published claim. We have not independently audited it.
curl "https://api.vendorstacks.com/v1/check?url=stripe.com" \ -H "Authorization: Bearer vr_live_…"
Facts about TheirStack are quoted from their own public pages, linked above, and were last checked on 2026-08-09. Nothing here is estimated: where TheirStack does not publish something, this page says so. If a detail is out of date, tell us and we will correct it.