I built an AI that reads stock charts — and made it grade its own homework

Dev.to / 6/10/2026

💬 OpinionDeveloper Stack & InfrastructureTools & Practical UsageIndustry & Market Moves

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Key Points

KlineVision is an AI technical-analysis tool that generates structured market reads (trend, support/resistance, candlestick/chart patterns, and Chan theory) and renders them directly onto the actual price candles instead of relying on text-only explanations.
The project emphasizes trust by removing “silent fallback” behavior: if real market data cannot be fetched, the system returns a 503 and shows that live data is temporarily unavailable rather than analyzing synthetic candles.
KlineVision uses Next.js on Vercel, Supabase (Postgres + RLS) for data/auth, and Gemini 3 Flash for analysis, with EODHD and Yahoo Finance as market-data sources.
A core design goal is accountability: the AI records every call it makes and later verifies whether the market actually confirmed its predictions, publishing both hit rates and misses.

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