AccessGrid builds APIs that companies can use to manage digital key fobs directly within Apple and Google's wallet platforms.

For cars that use key fobs and keyless entry, thieves can use a device to connect to a car's computer to make their own key fob copy.

Apple's Car Key turns your iPhone into a digital car key, letting you unlock, start, and share your ride — no key fob required. Here's how it works, and which manufacturers support the technology.