Hidden Letters is an Android app developed by Agile Fusion Studios (4900 Hopyard Rd, Suite #100 Pleasanton, CA 94588 USA).

Hidden Letters first became available on 22 Apr 2016. It is estimated that Hidden Letters has been downloaded between 500000 and 1000000 times from the Play Store.

Hidden Letters 7.1 requires the following permissions:

Allows applications to access information about networks.

Allows applications to access information about Wi-Fi networks.

Allows applications to open network sockets.

Allows an application to read from external storage.

Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.

Allows an application to write to external storage.