1. The shape problem
A tracker only works if you'll actually carry it, and three of these four fail that test in different ways. The AirTag is a disc that bulges out of a wallet and screams "steal me" to anyone who's seen one before, which by 2026 is most people. The generic Amazon card gets the shape right but cuts every corner behind it. Tile never solved shape at all, it solved software. Spotminders is the only one of the four thin enough to sit flat in a wallet, a passport, a laptop bag, or a suitcase lining without adding a millimeter of bulk. That difference decides whether you actually have your tracker with you when it matters, or whether it's sitting in a drawer because it didn't fit anywhere convenient.



