shouldiuse.io

VERDICT

Should I use TheirStack.com?

Discover companies by their tech stack and hiring signals. Track 33k technologies and 243M of job postings to identify and convert ready-to-buy leads. - theirstack.com

Depends. Buy if your sales or recruiting team prospects by tech stack or hiring signals — the data coverage is real and reviewers rate it highly. Skip it if you just need a simple contact list; a CRM or spreadsheet is cheaper and simpler.

Confidence

Medium. Based on 14 public sources; most reviews are small-sample (10 G2 reviews) or aggregator snippets.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in sources
  • Security posture

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
Paid plansNot disclosed in sources

Best for

  • B2B sales teams selling into specific tech stacks
  • Recruiters sourcing candidates via job postings
  • GTM teams using hiring signals as intent data
  • API-first data users

Not for

  • Small teams that just need a contact list — use a CRM or spreadsheet
  • Guess: teams needing verified emails/dials — it finds companies, not people
  • Risk-averse enterprises wanting a proven vendor — only 10 G2 reviews exist
  • Non-technical teams wanting plug-and-play CRM data with no setup

Gotchas - check before you buy

medium

Credit-based: searches and enrichments burn credits; heavy use adds up fast.

medium

Free tier is just 50 company credits — a test drive, not production volume.

medium

No pricing tiers itemized in public sources — verify full costs before committing.

low

Trust scanners conflict: Scamadviser/Scamflare say legit; Scam Detector scores 39.4.

Pros and cons

Pros

  • Tracks 33k technologies and 243M job postings across 195 countries
  • Free plan starts with 50 company credits
  • G2 users praise ease of use and accurate data
  • Public API with docs, SDKs, and good webhook reliability
  • Real-time job data with advanced filtering and instant results

Cons

  • Only 10 verified G2 reviews — thin track record
  • Credit-based pricing with plan limits; total costs unclear
  • Scam Detector flags a low 39.4 trust score, conflicting with other scanners
  • Founder self-promotes on Reddit; independent user reviews are scarce

Sources & method

Analyzed 9/21/2026 - 13 sources - No known vulnerabilities found in the sources reviewed.

official x3review x6security x3news x1

Key stats

  • Value for money: 4/5

    Rating

  • $0

    Starting price

  • 13

    Sources

  • Analyzed

  • Value for money: 4/5. Free tier plus credit-based plans that scale
  • Ease of use: 5/5. G2 reviewers praise clean, easy interface
  • Feature depth: 5/5. 243M jobs, 33k techs, 25+ filters, API
  • Support quality. No support evidence in sources
  • Security posture: 4/5. SSL, 5-year domain; one scanner disagrees
  • 4.9/5 G2 rating 10 verified reviews
  • 243M Job postings indexed From 358k sites across 195 countries
  • 33K Technologies tracked 13M+ companies in tech-stack directory
  • Yes Free tier 50 company credits to start

Pricing

Free

$0

  • 50 company credits to start

Paid plans

Not disclosed

  • Credit-based, scales with usage
  • Plan limits apply per third-party review

Security

No known vulnerabilities found in the sources reviewed.

What users say

G2 reviewers praise ease of use and data accuracy, but the verified review base is tiny.

“Users consistently praise the ease of use and accurate data provided by the product, The interface is clean”
G2 review summary
“As someone else suggested, looking at companies’ jobs is a good starting point. I created a tool (TheirStack.com) to make this easier.”
Reddit, r/cscareerquestions (founder post)
Full analysis

Based on 14 public sources; most reviews are small-sample (10 G2 reviews) or aggregator snippets.

Strong technographic/job-posting data for GTM and recruiting teams; overkill and pricey for small teams that just need contacts.

Methodology

Based on 14 public sources; most reviews are small-sample (10 G2 reviews) or aggregator snippets.

Sources

  1. TheirStack Reviews 2026: Details, Pricing, & Featuresg2.com
    review
  2. TheirStack Products | 10 Reviews on G2 (4.9 stars)g2.com
    review
  3. Pricing | TheirStack.comtheirstack.com
    official
  4. Job Postings API | TheirStack.comtheirstack.com
    official
  5. TheirStack Review & API Analysis | GTM Toolsgtmtools.dev
    review
  6. TheirStack Review: Features, Pricing & Alternatives (2026)coldiq.com
    review
  7. TheirStack Review 2026: Pricing, Features, and Alternativessyncgtm.com
    review
  8. Coresignal Alternative - TheirStacktheirstack.com
    official
  9. Reddit: Best way to find out a company's tech stack?reddit.com
    review
  10. theirstack.com Review - FlareScore: 92/100scamflare.com
    security
  11. theirstack.com Reviews | Scamadviserscamadviser.com
    security
  12. theirstack.com Reviews: Scam Detector (39.4)scam-detector.com
    security
  13. theirstack.com Competitors - Similarwebsimilarweb.com
    news

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