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.

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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.…