ふたば@アプリ にじろぐ(仮) is an Android app developed by Andosan and is available to download for free. The app is categorized under "Lifestyle" and is designed for users who frequently use the Futaba Channel. It is a notification app that informs users about new threads based on their registered keywords. The app crawls the catalog of the registered boards every 30 minutes and notifies the users about new threads. It also checks the status of the threads and updates it in the next crawl. The app offers a feature that detects the type of network and works only on Wi-Fi connections if the user chooses to do so. Users can customize the sound and vibration settings for notifications. The app is compatible with Android 4.1 and above.

Overall, ふたば@アプリ にじろぐ(仮) is an excellent app for Futaba Channel users who want to stay updated about new threads. The app is easy to use and offers various customization options for notifications. However, users must note that the app is currently available only in Japanese, and the registration of boards is required to receive notifications.