Wnn External Conversion Module G is an Android utility and tool application developed by OMRON SOFTWARE Co. Ltd. The app is free to download and use. It is designed to work with Wnn Keyboard Lab and enables users to perform kana-kanji conversion using the Google CGI API for Japanese Input. To use this app, you must have Wnn Keyboard Lab installed on your device.

The app works by sending the input string to Google CGI API for conversion. Users can access the conversion candidates by tapping the "external conversion" option that appears at the end of the candidate list during character input. It is important to note that when using this module, the input string for the conversion process will be sent to Google CGI API. The app may experience communication errors in Android 6.0 or higher's power-saving mode, but this can be resolved by deselecting the app from battery optimization in the device settings.

Overall, Wnn External Conversion Module G is a useful tool for those who frequently use Wnn Keyboard Lab and require kana-kanji conversion.