O-Farsça-Türkçe Sözlük is a mobile dictionary that offers a comprehensive collection of words for Persian learners. Developed by Osman Aslanoğlu, this dictionary is the first of its kind in the mobile dictionary market. It is a bilingual dictionary that allows users to search for words in both Persian and Turkish. The best part is that it works offline, so users can access it anytime, anywhere.

The app boasts a vast collection of over 100,000 words and meanings, making it an excellent resource for learners of all levels. The app's user interface is straightforward and easy to navigate. The app also allows users to contribute to the dictionary by submitting their suggestions and feedback. Overall, O-Farsça-Türkçe Sözlük is an excellent resource for anyone looking to learn Persian or Turkish.