1C Big Russian Keyboard is a free Android app developed by 1C Wearable. This app is designed for users who have difficulty with small keys due to poor eyesight or large fingers. The app features large keys and symbols that reduce eye strain and typing errors. The keyboard is a compressed QWERTY design, making it easy for users to adjust to the new layout.

To install 1C Big Russian Keyboard, simply download it from the Play Store and open the app. Then, set the keyboard as the default input method in the "Language and Input" settings. The keyboard will automatically be used in all applications that require text input.

The app has a variety of features, including the ability to switch between Russian and English layouts, adjust the keyboard size, access settings, and use voice input. The keyboard also includes emojis, stickers, and GIFs. Overall, 1C Big Russian Keyboard is a useful app for users who want a keyboard with large keys and symbols that is easy to use.