Solo dev built a free AI trading-signal app, now selling it for $4,900
Vortra is a web app that generates weekly buy/sell trading signals for stocks, crypto, and . Each week it picks 20 stocks from a pool of 302 across 20 sectors, then uses Groq's Llama 3.3 70B model to produce entry, take-profit, and stop-loss prices, combining real-time price data from Yahoo Finance with news sentiment pulled from RSS.
It has a self-learning that reviews the past 8 weeks of signals and adjusts strategy based on what worked, and it emails users when a take-profit or stop-loss level is hit. It's built with Next.js 15, React 19, TypeScript, Prisma, PostgreSQL (Neon), and , and runs entirely on — Groq's 1,000 free requests per day, Yahoo Finance's API, Neon's free database, and Vercel's free hosting — for $0 in monthly costs.
So far it has 15 users, 23 strategies, 62 trading signals, 389 page views, and an average session of 7 minutes 46 seconds. The creator is selling the whole thing for $4,900 to focus on other projects; the buyer gets full , the Vercel project transfer, the database, and a 30-minute onboarding call.
Key points
- Picks 20 stocks weekly from a 302-ticker universe across 20 sectors
- Uses Groq's Llama 3.3 70B to generate entry, take-profit, and stop-loss prices
- Has a that reviews the past 8 weeks of signals to adjust strategy
- Runs entirely on (Groq, Yahoo Finance, Neon, Vercel) for $0/month
- Selling the full and for $4,900 despite only 15 users