Posa'ls is an Android application designed for independent learning and practicing the use of weak pronouns in Catalan. The app features simple theoretical explanations and practical exercises divided into seven different sections that allow learners to step-by-step understand the contents in an easy and entertaining way.

The app targets learners of Catalan at the B2 and C1 levels of the Common European Framework of Reference for Languages (MERC), equivalent to intermediate (B) and proficiency (C) of the Directorate General for Language Policy (DGPL), but it is also useful for students of secondary school.

The content is structured into seven distinct sections, each containing a section on both theory and interactive exercises, with three different types of exercises and over 350 questions. The app also allows for tracking progress and results and the possibility of deleting them.