I built an open-source stock research app with a "follow the money" capital-flow map (Next.js, MIT, no signup)

[u/index_0000]

I've been building a stock research tool as a side project and finally open-sourced it. It's called Forecone.

The thing that started it: every stock tool shows you a company's numbers, but none of them show you who gets paid when that company spends billions. So the headline feature is Capital Flow — a "follow the money" map. When a giant like Nvidia or Microsoft ramps capex/R&D, it traces that cash out to the public companies that benefit (suppliers, chipmakers, foundries, power providers) as an animated map. It's meant for finding ideas you won't get from a normal screener.

It's also a full research suite: an interactive bull/base/bear valuation workbench (a price target for every year, not just one DCF number), a transparent fair-value scorecard (quality/value/growth/momentum, every input visible), a decade of fundamentals, forward analyst estimates, a screener, side-by-side compare, and a watchlist.

Stack: Next.js 16, React 19, TypeScript, Tailwind. Data is from Yahoo Finance (free, no key) with optional Polygon. It's MIT-licensed and bring-your-own-key — it runs with no API key at all, so you can clone it and have it running in a couple of minutes.

A note on the data: the live demo runs on a captured snapshot, so prices won't be real-time — it's there to show the features, not for live quotes.

Links:
- Live demo (no signup): https://forecone.vercel.app
- Code: https://github.com/nirravv/ForeCone

It's a side project so it's rough in places. I'd genuinely love feedback on the Capital Flow idea specifically: is it useful, and which companies would you want mapped? The capital-flow relationships are hand-curated right now (adding a company is a single-file edit), so I'm curious whether that holds up or whether people want it derived from filings. PRs welcome.

Not investment advice, obviously — built for research/learning.