We found that most wallet tracking solutions share the same fundamental problem: they are either too thick to comfortably carry in a wallet, or they lock basic features behind recurring subscription fees.

The wallet tracker market has exploded with card-shaped Bluetooth trackers designed to slide into your wallet like a credit card. But thickness varies dramatically — from 1.8mm to over 5mm when you include bulky AirTag holder accessories — and that difference matters when you sit on your wallet 8 hours a day.

We measured thickness, tracking reliability, battery life, alert responsiveness, and total cost of ownership over 24 months. Here is what the data showed.