الماهر - لوزن الشعر is an educational and reference app developed by Maher Najmi. It is available for iPhone and is free to use. The app is designed to help users write poems and check the weight of verses, as well as display the meter and activation for each poetic line. It consists of three sections: classical poetry weight, Nabati poetry weight, and activation poetry weight.

One of the key features of الماهر - لوزن الشعر is its internal database, which contains over 1800 weights for classical poetry, more than 200 weights for Nabati poetry, and all activations for activation poetry, including all the variations and exceptions.

The app offers various functionalities such as writing and saving poems, highlighting the fracture location in the line while writing, searching for weights in all meters and weights, displaying intersecting meters for the same weight, adding images to poems, sharing poems, editing lines, rearranging verses, and displaying information for each line, such as meter, weight, and activations by clicking on the line. It also allows users to sync and save their poems through iCloud, search within poems by title, lines, or meter, and more.

Overall, الماهر - لوزن الشعر is a comprehensive app for poetry enthusiasts, providing a range of features to assist in writing and analyzing poems.