Sealed Market
TCG Portfolio & Price Tracker
The Problem
Trading card collectors had no good way to track what their collection is actually worth. Existing tools were either spreadsheets, clunky web apps from the 2000s, or apps built for the US market with prices that meant nothing to European collectors. Nobody was building a real investment-grade portfolio tracker for this space.
The Approach
Dark, data-dense, but never overwhelming
Inspired by Robinhood and Delta. Professional investor feel instead of the colorful, playful aesthetic most collectible apps use. Every screen prioritizes information density while staying clean and scannable.
Real EU market prices, not estimates
Prices are sourced from actual European marketplace data so collectors see what their cards are truly worth in their market. Multi-currency support (EUR, USD, CZK, CAD) keeps everything accurate regardless of where you are.
Built for collectors who think like investors
Full P&L tracking, portfolio value charts over time, price history with volatility metrics, and set completion analytics. Your collection is an asset. The app treats it like one.
Maintained by one person with AI agents
AI agents autonomously fix production bugs, create pull requests, and ship features with human review at every step. This lets a solo developer maintain a product this complex.
The Result
3,500+
Collectors
70,000+
Tracked Products
60,000+
Items In Portfolios
The Product
Portfolio overview · Asset detail · Set browser · Add to portfolio