ETC Viewer is an Android application developed by Araneko that allows users to view their ETC card usage history information. The app retrieves data from the "ETC usage inquiry service" provided by highway companies and presents it in an easily understandable format on the user's device. With ETC Viewer, users can check their ETC card usage history for up to a month.

The interface of the app is user-friendly, and the app is easy to navigate. Users can view their ETC card usage history with just a few taps on their screen. The app also offers a search function that allows users to quickly find the information they need. ETC Viewer is free to download and use, making it an excellent choice for anyone who regularly uses the ETC card on highways in Japan.