The first version was a Numbers spreadsheet for a single binder of Wizards-era holos. Every Sunday morning, we updated the prices by hand: checking eBay sold listings, copying the median for each grade into the row, and watching the year-over-year column move.
After about six months of that, we wrote a Python script that pulled the comps automatically. After another year, we wrote an iPhone app for the script so we did not need to be at a laptop to add a new card. The app stayed private for most of 2024. When friends started asking if they could install it on their phones, we cleaned it up and put it in the App Store.
The goal has not changed since the spreadsheet: tell a collector what their binder is worth, honestly, with the comps visible. No predictions. No buy/sell calls. No upselling third-party services. The math runs locally where it can, the prices are real eBay sales, and the AI commentary is constrained to what the underlying data supports.
The thing we are most proud of is what we have not added. There is no marketplace, no consignment program, no "Binder coin," and no NFT integration. There is no public profile leaderboard. There is no social feed. There are no notifications outside of the price alerts you ask for. Apps for collectors do not need any of those things. They need an accurate, opinionated tool for the part of the hobby that is not the fun part.
Binder is small. It is built and maintained by a tiny team that mostly works nights and weekends. If you find a bug, email us. There is no support ticket system, just a human address that gets read every day.