Tập Viết Tiếng Việt Lớp 1 is a free Android app developed by Thanh Tam 123, designed for students in the first, second, and third grades, and even for those who are preparing to enter the first grade. The app offers a variety of writing exercises, including commonly used Vietnamese characters, two types of fonts, and the ability to write any text or sentence, suitable for teachers and parents to create homework assignments.

The app allows users to save their writing exercises as a list of assignments, and provides scoring after completing each exercise. It works well in both portrait and landscape modes, and features a zoom function to adjust to students' writing preferences. The app also detects and corrects inappropriate content to ensure that the writing exercises are suitable for young children.

One of the most powerful features of Tập Viết Tiếng Việt Lớp 1 is the ability to create writing worksheets, which includes zooming in and out of characters, selecting different types of fonts, and writing directly on the app. Users can export their worksheets as image files to print and practice writing at home, or save them for future use. This feature is particularly useful for students in higher grades.