Start your first
quant investment

Yes. You don't need to know what "factor" or "Sharpe ratio" mean to start — you describe what kind of stocks you want to buy in plain English, and the AI translates that into a real strategy. As you see backtest results, the terms become concrete. If you want a primer first, our /learn page covers the basics in 5 minutes.

Your first backtest typically runs in 30-60 seconds. So "I want to try an idea" → "I see how it would have done over 13 years" is about a minute, end to end. Building intuition for what works and what doesn't tends to take a few weeks of trying different ideas.

We run on Claude Sonnet 4.6 — Anthropic's flagship model — paired with a built-in backtest engine over 13 years of US equity data. ChatGPT can talk about strategies; we actually run them, on real historical data, and show you the equity curve, Sharpe, and max drawdown.

US daily price and volume data from major market data providers, covering 3,000+ tickers (the full S&P 500 plus the Russell 2000 small-cap universe) from 2013-01-02 through 2026-05. We don't currently have fundamental data (P/E, ROE, dividends, etc.) — our 75 factors are derived from price, volume, and technical signals.

Strategies are generated by Claude Sonnet 4.6, then run against real historical data. The AI's job is translation (English → factor strategy); the backtest itself is real math, not the AI making up numbers. The AI is good at picking sensible defaults; it's not infallible, and you should always read the metrics and decide whether the strategy makes sense to you.

Yes. The Factor Workshop lets you combine the 75 built-in factors using a visual editor — add, subtract, multiply, threshold, rank. Free tier supports up to 3 custom factors per account. You can also share factor IDs with the AI in chat so it incorporates your custom signal into strategies it suggests.

After you find a strategy you like, you can run it forward as a live simulation. Every market close, the strategy's picks are revalued at real prices and we update a hypothetical NAV — side-by-side against the S&P 500. So you can see at a glance whether the backtest's edge holds up in current markets, or whether it was an artifact of one specific historical window. No money at risk. Free.

No to both. Alpha Builders is a research tool, not a broker. We don't place trades, manage money, or provide personalized investment advice. We show you how strategies would have performed historically. Whether to act on that — and how — is your decision (and your broker's job).

Yes, fully free during early access. You can use everything: 40 AI responses per day, 10 backtests per day, all 75 factors, the full 13 years of US data. We may introduce paid tiers later for power users — when we do, we'll give existing users advance notice and early-bird pricing.

Yes. Your chat history, custom factors, and backtest history are tied to your account and not visible to other users. We don't sell user data. We do use anonymized usage logs to improve the product (which features get used, which factors get picked) — never anything identifying you individually.

Email: support@alphabuildersus.com. We read everything. Response time is typically under 48 hours.