The stack nobody warns you about — and what actually got it live. --- I built Buffett Stock Evaluator (https://kashvector.com/stock/) — a free tool that scores any stock against the Buffett, Ray Dalio, and Benjamin Graham frameworks — as a weekend project. Enter fullscreen mode Exit fullscreen mode One month later it's live on Google Play. Here's the story- The Stack Vanilla HTML/CSS/JS — no framework, no build step Cloudflare Worker — the secret glue that makes Yahoo Finance work Capacitor — wraps the web app into a native Android APK with almost no code changes Claude Code — AI pair programmer throughout The Yahoo Finance Problem Every free stock data project eventually hits the same wall: Yahoo Finance's quoteSummary endpoint requires a crumb — a token you can only get after completing a cookie handshake with fc.yahoo.com. You can't do this from a browser because of CORS. Public proxies that used to work got blocked or paywalled in early 2026.…