TheirStack vs Wappalyzer

TheirStack helps sales and marketing teams find companies that may need what they sell, using job postings as clues to company needs. Users can search companies by technology use across a catalog of more than 33,000 technologies, or filter job postings for keywords tied to their software’s use cases. The job-postings API covers 250 million jobs across 195 countries since 2021 and searches 362,000 other websites alongside named job boards.

The web app includes job and company search, company lookup, list enrichment, CSV or Excel exports, and daily or weekly email alerts. API plans add job search, company search, technographics and buying-intent endpoints, webhooks, and an MCP server for AI assistants. Integrations include Zapier, Make, N8N, Airtable, and contact-finding services such as Apollo, ContactOut, Instantly, and LinkedIn. TheirStack does not provide personal contact data directly, but connects to third-party providers and shows hiring-manager information for applicable jobs. Company exports are capped at 200 jobs per company; full job history is available through the Job Search API, webhooks, or MCP server. Free is available; API starts at $49 a month.

Wappalyzer turns public website signals into technographic data for prospecting, record enrichment and monitoring market changes. It identifies thousands of technologies across millions of websites using signals such as HTML, scripts, headers, cookies and other fingerprints. Users can upload CSV or TXT files with up to 100,000 URLs for bulk analysis. APIs cover technology lookup, lead lists, subdomain discovery and email verification. Live results count as five lookups each; cached results are verified within the last 30 days. The service offers browser extensions and integrations including Salesforce, HubSpot, Pipedrive, Gmail, Zapier, Make and an iPhone app. Basic extension detection runs locally, and sharing limited website-level data can be disabled in settings. The free plan includes 50 technology lookups and 50 email verifications per month, five website alerts and sample lead lists. Pro costs $250 a month for one user. Plan-included API credits expire after 60 days, while credits bought in bundles expire after 365 days. Wappalyzer is aimed at sales, marketing, operations, strategy, partnerships and security teams.