--- title: "How accurate is TheirStack?" description: "**Canonical URL:** https://jobspipe.dev/answers/how-accurate-is-theirstack" canonical: https://jobspipe.dev/answers/how-accurate-is-theirstack last_updated: 2026-09-18 --- # How accurate is TheirStack? > TheirStack is accurate about the thing it measures, which is technologies named in a company's job postings. Each signal carries a low, medium or high confidence score and links back to the postings behind it, so a claim can be checked by reading the evidence. It cannot see tools a company never names in a job ad, and its docs say it publishes no independently audited fill rate or third-party coverage benchmark. **Canonical URL:** https://jobspipe.dev/answers/how-accurate-is-theirstack **Topic:** Job data vendors and tools (https://jobspipe.dev/alternatives/theirstack) The bounds are stated in TheirStack's own documentation. A technology that is not mentioned is not treated as absent, so a company that uses a tool without hiring for it, or that is not hiring at all, does not appear under that tool. The confidence score weighs the number of mentions, how often a technology is named relative to others in its category, where the mention sits, with titles and job URLs counting for more than descriptions, and how recent it is. Companies with few postings therefore score lower, and the docs suggest keeping to medium and high confidence when false positives are costly and small companies are not the target. Coverage also varies by country, and reposts of the same title from the same company within thirty days are collapsed into one posting. The same evidence can be read directly from a postings index. On JobsPipe, POST /v1/jobs/search with skills_or set to a technology and company_name_or set to an account returns the postings that name it, and the technology_slugs field on each posting lists what the text mentions. POST /v1/stack/scan adds a second, independent view by fingerprinting what the company's domain serves, with a confidence score per detection. Postings are the stronger source for internal systems such as an ERP or a data warehouse, and a scan is the stronger source for what runs on the website. The practical test is a list of accounts whose stack you already know, such as your own customers. TheirStack searches and result counts consume no credits until you reveal data, so coverage of your segment can be measured on the free plan before buying. Run the same accounts through the JobsPipe sandbox search endpoint, which needs no key, and compare which vendor names the tools you know are there. ## Related questions ### What does a low confidence score mean in TheirStack? It means the evidence is thin, not that it is invented. TheirStack's docs say low and medium confidence technologies still come from real mentions in postings, and that companies which post few jobs naturally score lower. Their advice is to keep to medium and high confidence when false positives are costly and small companies are not the target, and to use every level otherwise. ### Why does TheirStack show fewer companies for a technology than expected? Because the data comes from job postings. TheirStack's docs explain that a company which does not name the technology in its ads, has no open roles, or hires for roles where the tool is not relevant will not appear. A lower count reflects how companies write job ads rather than true adoption, so treat the list as companies hiring around a technology, not as a census of its users. ### Is job-posting technographic data more accurate than website scanning? They measure different things. A website scan is reliable for what a public page serves, such as frameworks, analytics and hosting, and blind to systems behind a login. Postings name internal tools such as the ERP, the CRM and the data warehouse, but only when a company hires for them. Using both gives the fullest picture, which is why JobsPipe exposes postings search and a domain scan under one key. ### How fresh is TheirStack's job data? TheirStack's docs say it crawls continuously rather than in a nightly batch, and that each posting carries the date it went live at the source, the date TheirStack discovered it and a closing date. They also note that roles which are never syndicated to a job board can arrive late or not at all. Their freshness page publishes the current discovery latency, so check it for your market. ## More answers - [How does TheirStack work?](https://jobspipe.dev/answers/how-does-theirstack-work) - [What is Wappalyzer?](https://jobspipe.dev/answers/what-is-wappalyzer) - [What does TheirStack do?](https://jobspipe.dev/answers/what-does-theirstack-do) Data behind these answers is published as shares only; every figure can be reproduced against the JobsPipe API (https://jobspipe.dev/jobs-api). --- AI agents: the full machine-readable index of this site is https://jobspipe.dev/llms.txt?src=md-twin - API quickstart, no-key sandbox (POST https://api.jobspipe.dev/v1/sandbox/jobs/search), MCP server, pricing. Free key: https://jobspipe.dev/signup