I Built an iOS Stock Prediction App with Claude Code — Here's How It Went

Introduction Claude Code's coding ability has gotten seriously impressive. I used it to build an iOS app and ship it to the Apple App Store. In this post, I'll walk through the development process — what prompts worked well, where the bottlenecks were, and what it's like to vibe-code an entire app. What I Built Stock HiLo — an iOS app where you swipe cards to predict whether a stock will go up or down. https://apps.apple.com/us/app/stock-hilo/id6759896635 Swipe up for High, swipe down for Low. After voting, you see the community's prediction. I designed it around a card UI so you focus on one stock at a time — the swipe gesture doubles as both navigation and voting. I built this because I wanted a quick way to check shifting Mag 7 market caps, chart patterns, and new highs. Architecture Here's the high-level architecture and tech stack: Layer Technology Frontend SwiftUI Charts Lightweight Charts Backend Supabase (PostgreSQL + REST API) Data Collection Python Pipeline GitHub Actions (we