Kuluk, developed by Sightica Solutions Pvt Ltd, is an Android app designed to make communication easier for visually challenged and elderly users. It uses gestures to make calls, send messages, and communicate with others. The app offers multiple features such as Shake to Call, Tap to Call, Shake to Message, and Face-down to Cancel.

Shake to Call allows users to add a contact from their phone list and set a gesture against the number. Each corresponding number of shakes prompts for a confirmation and makes a call. To cancel the call, users only need to shake their phone once. With Tap to Call, users can customize the number of taps for each contact from their phone list (up to 4 numbers). Each corresponding number of taps prompts for a confirmation and makes a call, and to cancel the call, users can place the phone in a facedown position.

Shake to Message is a superior feature of Kuluk that allows users to send pre-set template messages and images (via MMS) by linking a shake against a number(s) from their phone book. The app also offers support for visually challenged users with Talkback and Eyes free for all Android OS versions.

Overall, Kuluk is a useful app for visually challenged and elderly users who want to simplify their communication process with the help of gestures.