Card Show Companion

The Card Show Companion is a free mobile-first tool designed for use at card shows. It helps you manage a buy list (cards you want to find with max prices), a sell list (cards you brought to sell with min prices), a purchase log (everything you bought with running totals), and a budget tracker so you never overspend. Everything saves locally on your phone.

Before the show: add cards to your buy list with maximum prices you want to pay, and add cards to your sell list with your asking and minimum prices. Set your budget. At the show: use the purchase log to track every buy in real time. Mark items as found or sold. Check the summary tab to see your running P&L and budget remaining.

Yes. All data is saved in your browser's local storage. Your buy list, sell list, purchases, and budget persist between page loads. Just don't clear your browser data before the show ends. Use the Copy Summary button to save a text backup of your show results.

For beginners, $50-$100 is a great starting point — enough to grab some nice cards from dollar boxes and a few mid-range picks. Intermediate collectors typically bring $200-$500. Serious collectors and dealers may bring $1,000+. Whatever your budget, the companion helps you stick to it with real-time tracking.

Walk the entire show before buying anything — prices vary 20-40% between booths. Bring cash (many dealers offer 5-10% discounts). Bundle purchases for better deals. Check eBay sold prices on your phone before negotiating. Shop the dollar boxes for hidden gems. The last hour of the show is the best time to negotiate.