Built a free portfolio tracker for my LEGO collection — sharing it in case anyone else wants to track ROI

I got tired of losing track of what my LEGO collection is actually worth, so I built a free site that lets you track every set you own and shows real-time resale value, ROI, and which retired sets in your collection are appreciating fastest. Free, no ads, no login required to browse. Sign-in is just for saving your collection across devices (no password — magic link to your email). What's there: Add any LEGO set + qty + what you paid → see current resale value, ROI %, total portfolio gain...