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Wappalyzer versus TheirStack.com
Compare	Wappalyzer	TheirStack.com
Verdict	Depends	Depends
Best for	SaaS sales teams selling into specific tech stacks	B2B sales teams selling into specific tech stacks
Who it's not for	Small teams that just need a simple contact list	Small teams that just need a contact list . use a CRM or spreadsheet
Privacy	One disclosed breach in 2020; no newer incidents found in sources reviewed.^⁶	No known public vulnerabilities found in the sources reviewed.
Support quality	No support evidence found	No support evidence in sources
Public sentiment	G2 users rate Wappalyzer 4.7/5 and praise its easy tech detection, while some Reddit users gripe about pricing and noisy results.	G2 reviewers praise ease of use and data accuracy, but the verified review base is tiny.¹²
Biggest gotcha	Pricing called "a mess" by third-party reviewers . audit plan limits before committing.^²	Credit-based: searches and enrichments burn credits; heavy use adds up fast.¹⁵

Pick Wappalyzer when

SaaS sales teams selling into specific tech stacks
Competitive intel on rival installs
CRM enrichment for tech-led outreach
Developers auditing site stacks

When Wappalyzer is not a fit

Small teams that just need a simple contact list
Buyers who hate confusing pricing tiers
Anyone wanting occasional free lookups . extensions cover that

Pick TheirStack.com when

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

When TheirStack.com is not a fit

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

Sources

Wappalyzer Products | Read 58 Reviews on G2g2.com
review
Wappalyzer Pricing, Reviews, Pros & Cons (2026)prospeo.io
review
Wappalyzer Pricing Plans, Costs & What You Get in 2026derrick-app.com
review
Plans & pricingwappalyzer.com
official
Wappalyzer - Technology profiler - Chrome Web Storechromewebstore.google.com
official
Wappalyzer discloses security breach after hacker starts selling datazdnet.com
news
Wappalyzer reveals data breach after hacker disclosed incident to customersbitdefender.com
security
I built a faster, free, open source alternative to Wappalyzerreddit.com
review
Wappalyzer showing over 50 technologies js libraries etcreddit.com
review
Wappalyzer generates $18M in revenuegetlatka.com
news
TheirStack Reviews 2026: Details, Pricing, & Featuresg2.com
review
TheirStack Products | 10 Reviews on G2 (4.9 stars)g2.com
review
Pricing | TheirStack.comtheirstack.com
official
Job Postings API | TheirStack.comtheirstack.com
official
TheirStack Review & API Analysis | GTM Toolsgtmtools.dev
review
TheirStack Review: Features, Pricing & Alternatives (2026)coldiq.com
review