Most investing tools are built wrong.
Bloomberg costs $24,000 a year. Morningstar hides everything behind a paywall. Most free tools are so watered-down they're useless. None of them were built for someone who just wants to understand a stock in plain English — fast.
CapitalSignal is the tool I wanted and couldn't find. Live prices, AI analysis, candlestick charts, analyst ratings, options flow, insider trades, DCF calculators, paper trading — all free, no signup, no ads. The same quality of analysis that institutional investors pay thousands for, available to everyone.
Built for beginners, students, and anyone tired of complicated investing tools.
You don't need an MBA. You don't need to pay for Bloomberg. You just need somewhere to look up a stock and actually understand what you're looking at.
How it works — no black boxes.
Here's exactly where every piece of data comes from. No mystery, no vague "AI-powered" claims.
Live stock prices & fundamentals
Real-time prices, OHLC chart data, market cap, P/E ratios, and key metrics — fetched directly from Yahoo Finance. Refreshes every 60 seconds.
Yahoo Finance APIFinancial news headlines
Real-time headlines aggregated from Reuters, Bloomberg, CNBC, MarketWatch, and other major financial publishers.
GNews APICrypto prices & market data
All cryptocurrency prices, market caps, and sparkline charts via CoinGecko's free public API.
CoinGecko APIAI analysis & market briefings
Stock analysis summaries written by me for 27 major stocks, based on public research. The AI Briefing page uses Claude by Anthropic for live market commentary. All analysis is informational only — never financial advice.
Claude AI · AnthropicI started from zero.
In early 2025, I didn't know what HTML was. I'd never written a line of code, never deployed a website, never called an API.
But I was obsessed with stocks — and I couldn't find a free tool that gave me everything in one place. Professional platforms cost thousands. Free ones were too basic. So I decided to build exactly what I wanted.
I taught myself HTML, CSS, JavaScript, and how APIs work by Googling everything and breaking things constantly. Every feature on CapitalSignal exists because I personally wanted it and had no idea how hard it would be to build.
Six months later: 40+ pages, 120+ features, zero prior experience, and a platform I use every day.
Tech stack
What's been built — and what's next.
Phases 1–3 — Core Platform
Live prices, charts, AI analysis, screener, portfolio tracker, watchlist, price alerts, news, market heatmap, crypto, earnings, and economic calendar.
Phase 4 — 40-Page Expansion
ETF Explorer, REIT Tracker, Futures, Commodities, Bonds, Global Indices, Macro Dashboard, Hedge Funds, Sector Rotation, Unusual Options, Dark Pool, 52-Week Scanner, Dividend Calendar, DCF, Options Calc, DRIP, Backtester, Correlation Matrix, and more.
Phase 5 — Games & Learning
Paper Trading ($100K virtual), Investing Quiz (30 questions, 3 levels), Stock Prediction Game, and AI Market Briefing powered by Claude.
Phase 6 — Real AI for Any Stock (In Progress)
Claude AI analysis for any ticker — not just the 27 pre-written ones. Requires Anthropic API billing.
Phase 7 — Custom Domain
capitalsignal.com. Makes the platform feel more permanent and professional.
Phase 8 — User Accounts
Cloud-saved watchlists, portfolios, and personalized email alerts.
This is just the beginning.
CapitalSignal isn't a school project I'll abandon. It's a product I plan to keep building. Here's what's coming.
Stock analysis in seconds.
Free forever.
No Bloomberg subscription. No paywall. No ads. Just the clearest, simplest way to research a stock — built by a 16-year-old who wanted it to exist.
I read every message.
Have feedback, a feature request, a bug report, or just want to say hi? I personally respond to everything sent here.