Private Kit is a privacy-focused app developed by Massachusetts Institute of Technology (MIT). It is designed to allow users to log their GPS trails on their own iPhone without compromising their privacy. The app ensures that your information is stored locally on your device and is never shared with anyone, not even with MIT or the app developers.

One of the key features of Private Kit is its ability to generate a trail of your device's location. It logs your location once every five minutes and stores the data for up to 28 days. Surprisingly, this is done using less than 100KB of storage space, which is even less than a single picture.

What sets Private Kit apart is its strong focus on privacy protection. The location log generated by the app cannot be accessed from outside your device, ensuring that your data remains secure. Additionally, the app allows you to import and export your location information, giving you control over how it is used in other projects and applications.

To use Private Kit, you will need to grant the app access to your location and motion tracking sensors. This allows the app to accurately log your GPS trails while maintaining your privacy.