The tech stack database
built for action
StackWho helps sales teams, recruiters, investors, and researchers discover what technologies companies use and connect with the decision makers behind those choices.
Why we built StackWho
Tools like BuiltWith and Wappalyzer tell you what technologies a website uses. But knowing a company runs React or AWS is only useful if you can act on it -- by reaching the VP of Engineering, CTO, or Head of Sales who made that decision.
StackWho bridges that gap. We combine comprehensive technology detection with verified decision maker contacts, so you can go from insight to outreach in minutes instead of hours.
No annual contracts, no $295/month price tags. Just the data you need to find, research, and connect with companies based on their technology choices.
By the numbers
How we collect and verify data
Accuracy matters. Here's how we ensure the data you rely on is current and correct.
Technology detection
We analyze public-facing website code, HTTP headers, DNS records, JavaScript libraries, meta tags, and CDN patterns to identify the technologies each company uses. We cross-reference job postings and public repositories for server-side technologies that aren't visible in frontend code.
Email verification
Contact emails go through multi-step verification: SMTP mailbox validation, domain MX record checks, disposable email detection, and cross-referencing with public professional profiles. Bounced addresses are removed in weekly update cycles.
Weekly updates
Our crawlers re-scan company websites weekly to detect technology changes, new tool adoptions, and removed technologies. Company metadata (employee count, location, industry) is refreshed from multiple data sources on the same cycle.
Contact sourcing
Decision maker contacts are sourced from public company pages, professional networks, press releases, and regulatory filings. We focus on C-level and VP-level roles: CEO, CTO, VP Engineering, Head of Sales, and other key decision makers.
Data you can rely on
Privacy compliant
All data is collected from publicly available sources. We comply with GDPR and CAN-SPAM regulations and honor opt-out requests promptly.
Always fresh
Weekly data refresh cycles ensure you're working with current technology profiles and valid contact information. Stale data is automatically flagged and removed.
Secure platform
Your account data and saved lists are encrypted at rest and in transit. We use Stripe for payment processing and never store credit card details on our servers.
Ready to get started?
Browse the full directory for free. Upgrade when you need full contacts and CSV exports.