A job-posting data API that reads 231 million ads to work out which companies use which technology and who is hiring for what, delivered through the app, an API or Clay.
What is
TheirStack
TheirStack has read 231 million job postings since 2021, and that pile of job ads is the entire product. It turns hiring text into two answers, which companies use a given technology and who is hiring for what right now, across 195 countries and roughly 13 million companies. The difference from a website scanner is where the evidence comes from. BuiltWith and Wappalyzer read a site's code and report what the browser can see, while TheirStack parses the ad for a Snowflake engineer or a NetSuite admin and reaches warehouses, ERPs and internal systems no crawler will ever find. It tracks around 33,000 technologies and pulls from more than 355,000 sources, the big boards plus Greenhouse, Lever, Ashby and raw career pages. Postings get deduplicated, salaries and locations normalized, and most carry firmographics and a hiring manager. You reach it through the app, a REST API, webhooks, flat files or an official MCP server. TheirStack answers a different question than the technographic tools we already use, and for trigger work it is the better question. BuiltWith proves a stack exists, while a job ad says a team is being built around it this month. We have not tried it, so we would pilot it against our hiring-signal workflows first.
Integrations and the modern GTM stack
TheirStack is a data source before it is an app, so its integrations are mostly about getting rows out of it and into something that can act on them. There is no CRM connector, and the route from a hiring signal to a rep goes through Clay, an automation platform or your own code.
Clay | Two Clay-built actions ship on every Clay plan, Find Jobs with TheirStack and Search for Companies with TheirStack, and both bill to Clay credits or to your own TheirStack key. For a team already building lists in Clay this is the shortest path from a job ad to an enriched and verified row. |
REST API | Job search, company search and technology lookup are behind one key with more than 25 filters across job, company and hiring-manager fields. Paid accounts get 4 requests per second and 500 results per page, while the free tier is held to 2 per second and 5 pages of 25 results. |
Webhooks | Four events trigger off a saved search, job.new, job.closed, company.new and tech.new, with tech.new gated behind an access request. Each delivery spends credits exactly as a query does, 1 for the job events and 3 for the company and technology events. |
Zapier, Make and n8n | Documented as webhook destinations rather than full published apps, which is enough to drop matching jobs into Airtable, Google Sheets or a Slack channel. Anything shaped like a CRM update you assemble yourself in the automation step. |
MCP server | An official MCP server exposes job and company search to an agent, so a model can query the dataset directly instead of you writing endpoint calls around it. It's on the API plans alongside webhooks. |
LinkedIn Audiences | Listed as a push destination, so a company list built from technology or hiring filters can be sent across as a matched audience for ads. It is the one activation route in the product that needs no code at all. |
Datasets and flat files | Full history back to 2021, history only, or updates only, delivered as flat files for a warehouse and priced by a conversation with sales. This is the route when you want the data joined against your own tables rather than queried live. |
What is missing | No native HubSpot, Salesforce or Pipedrive app, so nothing reaches a CRM record without work on your side. There is also no contact data in the product at all, so every list still needs an email and phone layer before anyone can send anything. |
Pro’s
Because the evidence is a job ad, it reaches the back end, so warehouses, ERPs, CI/CD pipelines and security tooling all show up where a website crawler only ever sees the front end.
A hiring signal carries timing that a website scan cannot, since an ad for a Snowflake engineer says a team is being built around that tool this quarter rather than at some unknown point in the past.
TheirStack publishes its own freshness numbers, claiming 90 percent of new technology postings are found within 24 hours and 73 percent the same day, drawn from more than 355,000 sources including Greenhouse, Lever, Ashby and raw career pages.
The plumbing is properly built out, with a REST API, four webhook events including job.closed and tech.new, flat-file datasets for a warehouse and an official MCP server for agents.
Pricing is public and cheap for this category, starting at $49 a month for 1,500 API credits with a permanent free tier, against BuiltWith at $295 a month and enterprise technographics that costs five figures a year.
Clay ships two native TheirStack actions on every plan and both accept your own API key, so the signal lands in the table where the enrichment and verification already happen.
Cons
The signal only exists where a company hires in public, so small teams, hiring freezes and companies that recruit through their own network return nothing at all.
A tool named in a job ad is a requirement a recruiter typed, so it is evidence rather than proof, and migration ads name the system being replaced while agencies post on behalf of clients they never name.
There is no contact data anywhere in the product, no emails and no phone numbers, so TheirStack goes in front of an enrichment and verification layer instead of replacing one.
API credits burn per row returned, one credit per job posting and three per company lookup, so a wide country-level query can cost thousands of credits before you have filtered it down to anything you would send to.
Nothing pushes into a CRM natively, with no HubSpot, Salesforce or Pipedrive app, and the parser is most confident on English postings, so non-English markets read thinner than the country count suggests.
Pricing
Free
$0/month 50 company credits and 200 API credits every month, only for accounts that have never bought credits
Job search, company search and technographics
Capped at 5 pages of results, 25 per page
2 requests per second on the API
No credit card required
App credits
$109 one-time 1,000 company credits, one-time purchase, credits roll over for 12 months
5,000 for $199 and 10,000 for $299
20,000 for $399 and 50,000 for $549
100,000 for $749 and 200,000 for $999
CSV and Excel export, email alerts
500 results per page, unlimited team members
API plans
$49/month 1,500 API credits a month, around 10 percent cheaper per credit than one-time purchases
5,000 for $100 and 10,000 for $169
20,000 for $240 and 50,000 for $400
100,000 for $600 and 200,000 for $900
Scales to 5,000,000 credits at $5,500 a month
4 requests per second, webhooks and MCP server
Datasets
Custom Talk to sales, priced per scope
Full history plus ongoing updates
History only or updates only
Flat file delivery for a warehouse
Built for analytics and model training
How it fits your stack
Alternatives
At a glance
231M job postings analyzed since 2021
33,000 technologies read out of job ads
195 countries and 355,000+ sources
90% of new tech postings found in 24 hours
Job search, company search and technology lookup
REST API, webhooks, flat files and MCP server
Native Clay actions on every Clay plan
Free tier with 50 company and 200 API credits
Read some of our client stories
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