معجم مقاييس اللغة - لابن فارس is a free Android application developed by So Smart Apps and falls under the Education & Reference category, specifically Books. The application is a comprehensive Arabic language dictionary authored by Ibn Faris, Ahmad bin Faris bin Zakaria al-Qazwini al-Razi Abu al-Husayn, who is known as one of the imams of language and literature. The app has several features, such as the ability to change font size, color, and shape, as well as the ability to change the page's background color and use photo backgrounds. Additionally, the app has a search feature, where users can search for any word in all doors, sections, or chapters. Users can also save their notes, favorite doors, and settings. The app is available in ten different languages and has a timer for setting the time period for automatic reading and exit.