AgentData vs TheirStack (2026): websites or job posts, compared

Disclosure: We make AgentData. Every TheirStack fact below is from TheirStack’s own pages, read on 28 October 2026 and footnoted.

At a glance

Why teams choose AgentData

On the list because the product is there

TheirStack sources its technology data from job postings, and its own documentation is candid about the limit: “A technology that is not mentioned is not a technology that is absent.” A company that uses a tool without naming it in a job ad, or is not hiring, does not show up under it.^[3] We read the company’s own website and domain records, so a help desk widget or an email platform’s record counts whether or not anyone is hiring.

A flat price instead of paying per company

AgentData Pro is $99 a month for 10 customer lists and 100,000 records to download a month, and downloading a company again does not count.^[6] TheirStack spends one company credit per company you reveal or export, then lets you view or export it again for 90 days, and searching uses no credits: $109 buys 1,000 and $749 buys 100,000.^[1]

The new customers, every week

We flag a company as soon as we see it start using a product, on a live feed of new customers and in a weekly email on Pro. We track 4,281 technologies across 34 million company websites, with CRMs, help desks, email, payments and chat first.^[5]

Open the customer list for the product you sell against. The first 25 companies show with no account.Start 7-day trial →

Pricing: a flat $99 a month, or TheirStack credits per company

Plan	Price	What it covers
AgentData trial	7 days, no card	Everything in Pro, with up to 1,000 records to download
AgentData Pro	$99 a month ($990 a year)	Customer lists for 10 technologies, 100,000 records to download a month, weekly new-customer alerts
AgentData Business	$299 a month ($2,990 a year)	Unlimited technologies, 1,000,000 records a month, CRM integration, unlimited users
TheirStack, 1,000 credits	$109	Jobs, technologies and firmographics for 1,000 companies
TheirStack, 10,000 credits	$299	The same, for 10,000 companies
TheirStack, 100,000 credits	$749	The same, for 100,000 companies
TheirStack monthly subscription	From $98 a month	1,000 companies a month (10% off the pack price)
TheirStack API	From $49 a month	1,500 API credits, webhooks and the MCP server

TheirStack from its pricing page on 28 October 2026^[1]: app credits are one-off packs whose unused credits roll over for 12 months, or a monthly subscription at 10% off. AgentData from our pricing page.

Proof on every row

A list is only useful if your team believes it. Every company on an AgentData list shows how we know it uses the product, and when we first and last saw it. Some tools show up in a website’s code; others only in the domain’s email and verification records, which is how we find help desks, email platforms and sign-in tools that a job ad may never mention.

Where TheirStack is stronger

TheirStack tracks 33k technologies from the analysis of 257M job postings in over 195 countries, which reaches tools that rarely show on a company’s website: programming languages, databases, ERPs.^[2] It adds hiring and buying-intent signals from the text of job ads, links every technology to the job posts behind it with a confidence score, and sells credits you can buy once and keep for 12 months, with unlimited team members.^[3][1] If you sell developer or data tools, or want to know who is hiring for what, it is the better fit.

Verdict

TheirStack reads the job ads. AgentData reads the company’s own website and domain records: the customers of the B2B products you sell against, with proof, and the new ones every week, for a flat $99 a month.

Which to choose

Choose AgentData if

• you sell against B2B products companies run every day, such as help desks, CRMs, email and payments;
• you want companies on the list whether or not they are hiring;
• you want to reach companies as soon as they start using a product;
• you want customer lists inside Claude, ChatGPT or Cursor;
• you want a flat monthly price instead of paying per company.

Choose TheirStack if

• the tools you care about are internal, such as languages, databases and data platforms;
• you want hiring and buying-intent signals from job ads;
• you would rather buy credits once and use them over a year.

Comparing more tools? Our roundup of tools that find the companies using a technology covers nine, from free extensions to enterprise data.

Moving from TheirStack

1. 01List the products you trackWrite down the technologies in your TheirStack searches. Each becomes one of your customer lists in AgentData; Pro covers 10.
2. 02Open each customer listLook up each product's customer list in AgentData and check it against your TheirStack export on companies you know.
3. 03Get the weekly new-customer emailPro emails you every week with the companies that just started using the products on your lists.
4. 04Keep job data for what only job posts showTheirStack sells credits as one-off packs as well as subscriptions, so you can keep it for internal tools and hiring signals without a monthly plan.

Start a 7-day trial with no card, download up to 1,000 companies, then compare them with your TheirStack export.Start 7-day trial →

curl -s "https://agentdata.run/api/v1/lookup?domain=basecamp.com" | jq -c '.technologies[] | select(.detection_method | startswith("dns")) | {name, detection_method, first_seen: .first_seen[:10], last_seen: .last_seen[:10]}'

{"name":"Atlassian","detection_method":"dns_txt","first_seen":"2026-04-14","last_seen":"2026-09-29"}
{"name":"Google Search Console","detection_method":"dns_txt","first_seen":"2026-04-14","last_seen":"2026-09-29"}
{"name":"Mailchimp","detection_method":"dns_spf","first_seen":"2026-04-09","last_seen":"2026-09-29"}

claude mcp add --transport http agentdata https://mcp.useagentdata.com/mcp

TheirStack pages read on 28 October 2026; screenshot taken on 28 October 2026. We did not use any page that asked for a bot check. AgentData and TheirStack are trademarks of their owners. Spotted something out of date? Tell us at hello@useagentdata.com.