NES Collector App

Compare nes game prices and track your nes collection with NES Collector App directly on the sites where you shop.

Built for collectors of original Nintendo Entertainment System titles, the extension brings ownership and market context directly to the pages you browse, without the need to open other sites or apps along the way. When you open a web page with a supported listing, the extension identifies the title and lets you: 📚 see whether you already own it 💰 see how the asking amount compares with similar offers 🔎 decide whether the offer is worth considering ❤️ mark it as owned or add it to your wishlist 📈 track your progress Instead of relying on a single asking amount, you can compare the current offer with the median of similar listings directly on the page you are viewing. Comparisons are based on active asking amounts from comparable listings. They are intended to show how the current offer sits against the market, rather than provide a guaranteed sale value or appraisal. 🔍 To keep comparisons relevant, market data focuses on similar loose NTSC-U cartridges. Non-comparable listings such as sealed, graded, CIB, box-only, manual-only, reproduction, bundle, or lot offers are filtered out. 📦 Physical copies can vary by condition, completeness, region, and other details. The extension compares an nes game cartridge with similar listings to provide more relevant market context for the current offer. When browsing nes cartridges for sale, the extension can use the item price and shipping cost to compare the total asking amount with similar offers. This makes the comparison more useful when listings have different shipping charges. To make comparisons more relevant, the extension can use: 1️⃣ item price 2️⃣ shipping cost 3️⃣ listing condition 4️⃣ similar offers 5️⃣ the median asking price The median price is used as a reference, not as a fixed value for a cartridge. The actual asking price can still vary depending on the condition of the copy, shipping cost, and the offers currently available. 📚 Your library stays connected to the pages where you shop. The extension uses your ownership data together with pricing information, so you can see each listing in the context of what you already own and what you may still want to add. 🔗 Recognized titles are matched to the same catalog entry, allowing ownership and wishlist status to remain consistent even when the same release appears on different shopping sites. Ownership data gives each listing personal context. Whether you maintain a small personal library or work toward a complete nes game collection, the extension can help you avoid accidental duplicates and focus on titles you still want to acquire. 🌐 Keep the same context across supported shopping sites: ✓ use the same library wherever you browse ✓ keep your wishlist available across supported stores ✓ check ownership without switching to another service ✓ compare offers using the same pricing reference ✓ move between shopping sites without losing track of what you own Each supported shopping site uses the same catalog and comparison logic, while page-specific integration reads the title and offer details available on that site. 📚 Explore the full library alongside your own collection: ➤ browse the complete nes game list ➤ search the catalog for a specific title ➤ view the titles you already own ➤ find titles still missing from your library ➤ review games saved to your wishlist 🎮 The extension is built around physical nes game cartridges rather than ROMs or digital libraries. It focuses on the real cartridges you collect, buy and own. The catalog is built around the nes games list for licensed NTSC-U releases, so the same collection and pricing tools can be used for common titles, rare nes games, sought-after releases, and other hard-to-find titles. ⏱️ No need to spend time on: • checking an nes price guide for every title • looking up a game value on a separate website • comparing nes cartridge prices across multiple tabs • cross-checking every listing against an external collection tracker • calculating your collection progress manually 🔒 Your collection data stays with Chrome, so there is no need to create a separate account just to track owned and wishlist titles. 🔄 When Chrome sync is enabled, owned and wishlist data can follow your signed-in Chrome profile across supported devices.