With over 91% of Americans now owning cellular devices (PEW Research Center, 2019), mobile applications (apps), like those used for foreign language learning (FLL), are becoming increasingly popular (Yu, 2019). However, it is unclear what research has been conducted to determine how effective mobile apps are at teaching foreign languages. To address this gap in the literature, the authors conducted a systematic review on existing FLL app research to determine trends in the literature and identify studies with quantifiable efficacy measures (Olsen et al., 2021). Although no current literature review to their knowledge has focused solely on FLL apps, a study completed similar work by investigating literature on mobile-assisted language learning (MALL). Building on that study's research, they conducted a systematic review using the same criteria to identify studies with quantifiable efficacy measures. However their review differed by including only research on mobile apps that focused specifically on FLL.