Attentional bias has been purported to be responsible for several psychiatric disorders such as anxiety, post-traumatic stress, and substance abuse. To address the problems experienced by patients, attention bias modification training (ABMT) is commonly used as a form of treatment. Yet, the accessibility of this treatment still remains a challenge. Recent studies have proposed app-based ABMT leveraging the popularity and convenient use of smartphones. While past reviews have explored the design methods and their efficacy, there remains a lack of systematic evaluation of the phenomenological characteristics of the ABMTs offered. This study used systematic review and meta-analytic procedures to investigate the effect of ABMT on attention biases and mental health symptoms. The novelty of the study is the investigation of the phenomenological characteristic of app-based ABMT that contributes to its efficacy.