JwwViewer is an Android application that allows users to view drawings created in JWCAD's Windows version "Jw_win" with the extension ".jww". It enables users to zoom in and out of drawings, change the display layer, and more. The app can access jww files saved on the SD card or online storage services like Dropbox. Users can leave feedback and suggestions in the app's review section.

To use the app, users need to create a suitable folder on the SD card and copy the JWW files into it. The default reference location for the app is "/mnt/sdcard/JwwViewer/" on the first launch, but users can change it as needed. The app displays a list of JWW files in the folder, and users can select a file name to view it. The app supports both portrait and landscape orientations, and users can switch between them. Users can also toggle the display of layers and layer groups on and off.

It should be noted that while the app has been tested with sample drawings included in Jw_win7, some drawings may not be displayed correctly. The app is not an official Jw_cad product but an experimental one, so users should keep this in mind when using it.