04 — STAX
STartup Architecture indeX
Live tech stack signals across 10,000+ venture-backed startups. Detecting what they build on, where they're hiring, and what's changing, scan by scan.
% = share of the startups in that category. n = companies with any tool in the category.
Every place reads the same dataset, refreshed four times a week from live scans.
Tool by tool in every category: AI models, frameworks, cloud, CDN, payments, and more. The full version of the board above.
Open → MovingWhich tools are gaining and losing startups between scans.
Open → UniverseEvery venture-backed startup in the scan, across 79+ VC portfolios. Slice the stack by investor.
Open → Library · For subscribersSTAX briefs and AI Insights: written analysis of what the signals say.
Read → MethodWhat we scan, what an outside scan can't see, and how a signal becomes a number.
Read →STAX detects signals from public sources only: company websites, job board platforms, GitHub organizations, job descriptions, DNS patterns, CSP headers, and more. No scraping of private systems. No access to non-public data.
Signal detection rates are not adoption rates — absence of a signal doesn't mean absence of use. But the signal that does leak through tells a consistent story, and it shows up weeks before it lands in earnings calls.
Read the full methodology →Why
STAX is the upstream sensor network I always wanted. It scans four times a week, tracks every company, and feeds the thinking behind everything I write at From the Porch.
This is a working tool, not a data product. The more you see here, the more you're seeing what I'm seeing.
— David Levy, Porch Capital