Credit cards have a standard size — 8.56 cm wide by 5.398 cm high — to ensure universal acceptance. Many or all of the products on this page are from partners who compensate us when you click to or ...

Think of the Chipolo Card Spot as a very flat AirTag. Put either device into something valuable and you’ll be able to locate it with your iPhone, whether it’s lost in your home or out in the world.

Prototype plans are on GitHub where the maker encourages experimentation, modification, and non-commercial use.

For years, Raspberry Pi boards and similar devices have been marketed as credit card-sized computers. But while that ...