Cardholm is a collection management platform for trading card owners who want a clear, up-to-date view of what they own and what it is worth. It tracks raw and graded cards as well as sealed products, organizing each item by set, condition, and grade while recording quantity and purchase cost. Values are matched to real market sales and refreshed daily, helping users monitor portfolio value, gains and losses, and market movements.

The platform includes tools for estimating whether grading a card may be worthwhile. Users can compare potential grades and values, account for grading fees and shipping, review break-even points, and see PSA population counts. Additional features include daily market movers, watchlists and price-target alerts, card scanning and fuzzy search, and CSV bulk imports. Collectors can also track set completion, share a public collection showcase, record realized profit and loss on sold cards, and use USD, EUR, or GBP. Cardholm serves collectors, investors, and sellers, with a free-to-start service and a native desktop app in development.