Hidden

Hidden aims to keep journalists, activists, and human rights workers safe.

It's increasingly difficult for users to trust their smartphones. They may be tampered with by malware programs, causing them to transmit location information even when the user may believe that the device has been placed into a safe “Airplane Mode.”

Edward Snowden, who is a board member of a nonprofit group called the Freedom of the Press Foundation, said he was concerned that cellphones and smartphones serve as tracking devices that automatically create electronic dossiers that give third parties, including governments, detailed information on location.

Hidden was designed to keep journalists, activists, and human rights workers from being tracked by their own devices leaking their location details and it does this by monitoring the radios of the smartphone including Cellular, GPS, WiFi and Bluetooth. Hidden will alert you with a notification when your smartphone is disclosing your location when it's supposed to be in "Airplane Mode".