Doğrusu Nasıl Yazılır is an Android app developed by Ahmet ÇELİK that focuses on Turkish grammar. This free app includes over 1000 words that are commonly misspelled or misused, grouped under six different categories. The app offers users the ability to test themselves on specific topics, look up the meanings of unfamiliar words, and mark questions for future reference. Users can also retake incorrectly answered questions and track their success rates by category. Additionally, the app allows users to add their own questions for others to answer. The app also sends notifications for users to practice at their preferred frequency. Doğrusu Nasıl Yazılır is an effective tool for anyone looking to improve their Turkish grammar skills.