ReplayRoom

A web-based trade replay tool for day traders, live at replay.trading. Built solo from scratch as my first software project.

• Bar-by-bar replay

  Replays your executions bar by bar, with each fill marked on the chart at the exact bar it happened.

• Manual or imported

  Takes trades by manual entry or by import from Interactive Brokers.

• Playbooks

  Stores and tags replays into custom playbooks.

• GIF export

  Exports a replay as an animated GIF for sharing.

ReplayRoom is a React and TypeScript front end built with Vite, charting on TradingView's Lightweight Charts, over a Supabase backend of PostgreSQL, Auth and Edge Functions. Price data comes from Polygon.io and billing from Stripe, whose webhooks run on those same Edge Functions. It was my first software project, built solo from scratch, and it deploys to Vercel from GitHub with a separate staging environment in front of it.

Front end

React 18, TypeScript and Vite, with TradingView's Lightweight Charts for candlestick charting

Back end

Supabase — PostgreSQL, Auth and Edge Functions — hosted on Vercel with auto-deploys from GitHub

Data and billing

Polygon.io for real-time and historical price data across six timeframes, from 2-minute to weekly. Stripe handles billing, with webhooks running on Supabase Edge Functions. Sign-in is Google OAuth

Design

A custom neobrutalist system with hard black borders, flat drop shadows and no rounded corners, set in Manrope and Geist Mono

Process

A separate staging environment with its own Supabase project, so chart and schema changes are tested before they reach users