Recent years have seen the emergence of mobile devices that help learners acquire foreign languages more effectively, but few such are designed to aid learners of Arabic as Foreign Language (AFL). This paper examines a smartphone application (CAVE) that provides easy access to Arabic verb conjugation paradigms in a bilingual format. There are several digital tools available for conjugating Arabic verbs, such as the web-based Acon and Qutrub. These are valuable, and an improvement over paper-based tools, such as the 500 Verbs books series. Yet neither of them are optimized for mobile users, and a smart phone application allows students to access information more easily than a book or website. This paper discusses the pedagogically-based development of mobile apps, and specifically how CAVE is designed to meet the Arabic language learner's needs. For example, CAVE enables users to look up verbs quickly and efficiently, covering 170 conjugation paradigms for over 1600 common verbs. In addition to the conjugated forms, it assists the learner by providing audio recordings, English equivalents and a phonemic transcription (CARS). An important feature of CAVE is its ability to perform full form search, allowing users to access verbs from any of their inflected forms, from their English equivalents, or from the root. The paper also describes an innovative phonemic transcription system (CARS), used in CAVE, which was specifically designed to enable learners to pronounce accurately, and compares its features with other romanization systems. The most important feature of CARS is its readability: its unambiguous encoding of phonological and prosodic information in an intuitive, easy to read set of symbols. The new system has several unique features not found elsewhere, including a symbol set that represents all Arabic phonemes unambiguously, and, for the first time, symbols indicating word stress and vowel neutralization. Together, CAVE and CARS provide an important contribution to the field of Arabic as a Foreign Language.