ThomsonData and TheirStack both help you find companies using specific technologies — but they take fundamentally different approaches. ThomsonData sells pre-built static data lists. TheirStack provides a real-time API and platform for live technology and job data intelligence.
Quick Decision Guide
Choose TheirStack if
- ✓You need real-time, continuously updated data — not a static snapshot
- ✓You want an API for programmatic access with 40+ filters and webhooks
- ✓You want one-time purchases available — buy credits once without any subscription or recurring commitment
- ✓You need to trace technology signals back to their source for verification
- ✓You want job data and hiring intent signals alongside technographic data
- ✓You need transparent methodology — know exactly how technologies are detected
- ✓You want self-serve access with a free tier to evaluate data quality first
Choose ThomsonData if
- ✓You need pre-packaged contact data (email, phone) alongside company data in a single list
- ✓You prefer browsing a catalog of pre-segmented lists rather than running custom queries
Feature comparison
Access & Data Model
| Feature | TheirStack | ThomsonData |
|---|---|---|
| Data access | ✓Real-time API + UI | Static list purchase |
| Pricing | ✓Free tier + plans from $49/mo, one-time purchases available | Quote-based (per list) |
| Data freshness | ✓Updated every few minutes | Monthly or every 90 days (their pages disagree) |
| Free tier / trial | ✓Yes — 50 company credits/month | No (sample file on request) |
Data & Capabilities
| Feature | TheirStack | ThomsonData |
|---|---|---|
| Jobs API | ✓Yes — real-time, 40+ filters | No |
| Technology detection | ✓Job posting analysis, linked to the posting behind each signal | Website scanning, job postings, partner directories and SEC filings, with no per-record evidence |
| Contact data | Via integrations (Apollo, ContactOut, LinkedIn) | Included in lists (email, phone) |
| Hiring intent signals | ✓Yes — from job postings | No |
| Custom filtering | ✓40+ filters with regex support | Pre-built lists, or custom builds through sales |
Integration & Developer Experience
| Feature | TheirStack | ThomsonData |
|---|---|---|
| API | ✓Yes — sub-second response | No API |
| Webhooks | ✓Yes — real-time notifications | No |
| Documentation | ✓Public, comprehensive | Not available |
| Job deduplication | ✓Yes — built-in | N/A |
What is ThomsonData?
Thomson Data is a B2B data provider that sells pre-built email lists and contact databases segmented by technology usage, industry, job title, and geography. If you want a list of "companies using Salesforce" with decision-maker contact details, Thomson Data provides that as a static, one-time purchase.
TheirStack is fundamentally different — it's a real-time data platform. Instead of buying a static list, you query a live database of millions of job postings and companies through an API or web interface, with data updated every few minutes.
Static lists vs. real-time intelligence
This is the core difference between ThomsonData and TheirStack:
ThomsonData sells a snapshot — a list that was accurate at some point in the past but begins decaying the moment you receive it. Contacts leave companies, technologies change, and companies grow or shrink. Refreshing it means placing a new order, or buying a yearly Data-as-a-Service license to their monthly-updated database.
TheirStack provides living data. Every time you make an API call, you get the latest information. Set up webhooks to be notified instantly when a company starts hiring for a technology you care about. The data never goes stale because it's continuously updated from 362k job sources.
TheirStack also offers a free tier with 50 company credits/month. And if you only need data once, TheirStack offers one-time credit purchases — no subscription required. You buy a credit pack, use it within 12 months, and you're done. This gives you the same flexibility as a static list purchase, but with real-time data and full API access.
Data transparency and methodology
ThomsonData publishes its methodology at a high level: it scans public-facing parts of company websites, reads job postings that mention tools, and checks vendor case studies, partner directories and SEC filings, then applies human verification. What it does not deliver is per-record evidence: a row in the file does not say which of those sources found the technology or when, and its update frequency is stated as monthly on one page and every 90 days on another.
TheirStack's methodology is fully transparent: we analyze job postings. When a company mentions PostgreSQL in a job listing, we capture that signal with a confidence score. You can click through to the actual job posting to verify any technology signal.
Filtering and customization
ThomsonData provides pre-built lists, and its team builds custom segments on request — but every custom build goes through sales, so you can't run and refine queries yourself.
TheirStack offers 40+ filters that you can combine freely:
- Company filters: Industry, size, country, revenue, funding, URL, LinkedIn slug, etc.
- Job filters: Title, description, country, city, remote options, salary, etc.
- Regex support on title, description, and location fields for precise matching
Job data and hiring signals
ThomsonData does not provide job data. TheirStack gives you real-time access to job postings from 362k sources with built-in deduplication, webhooks, and historical data back to 2019. Hiring data provides a powerful intent signal — companies actively hiring for a technology are actively investing in it.
UI and contact data integrations
- Beyond the API, TheirStack provides a rich UI where you can run company and job searches and quickly find people contacts from selected companies.
- We integrate with leading contact data providers (Apollo, ContactOut) and LinkedIn (Free, Recruiter, Sales Navigator) to streamline outreach from search results.
When to choose each
Choose ThomsonData if you need a quick, one-time email list for a specific campaign and don't need ongoing data access or real-time updates.
Choose TheirStack if you need real-time technology intelligence, job data, hiring intent signals, and a programmable API for continuous prospecting and monitoring.