Tiếng Việt 1 - tập 12 is an Android application developed by TomLe.Studio. It is a free educational and reference application that supports Vietnamese children between the ages of 5 to 8 years old in learning to spell. The app follows the Vietnamese 1 textbook of Vietnam Education Publishing House. The application is intended to be used as a supplementary tool to help children practice on their own, but children still need guidance from teachers or parents.

The application offers various features that include touch letters to spell and read, swipe to switch pages, and a clear table of contents to move quickly to the lesson. The content in the application is completely based on the textbook and is not edited or customized.

The application provides high-quality features such as high-resolution photos that look good on both large and small screens. Also, it offers a standard voice in three regions (north, center, and south) that is clear and unmixed. Users can adjust the reading speed to fast, medium, or slow based on their preference.

It is important to note that the application uses the traditional spelling method, and the new spelling method will be updated according to user needs.