4. Sınıf İngilizce is a free Android application developed by Ugurbas that aims to make language education fun and engaging for young learners. The app is designed to be compatible with the primary school curriculum and contains all the words found in the textbooks and listening materials. The application includes activities that help improve the fundamental language skills of reading, writing, and listening. The app provides the single meaning of each word, as found in the curriculum, to avoid confusion for students.

4. Sınıf İngilizce offers interactive learning with audio and visual aids, such as picture cards, to help students memorize words. After studying the word lists, students can take five different types of quiz games to reinforce their learning. The app also has a feature that allows students to add the words they have memorized to a separate list to focus on the words they need to learn. The app automatically moves the words that are answered incorrectly to the "not memorized" list, so students can focus on them again. Parents and students can track their progress by filtering test results by daily, weekly, or overall performance. This program can also be used as a dictionary.