GJoy Dex Analyzer (GDA) is described as Asia's first fully interactive modern decompiler, and also one of the world's earliest Dalvik bytecode decompilers.

GDA is not only a decompiler, but also a lightweight and powerful integrated reverse-analysis tool. It does not depend on Java and supports decompilation of apk, dex, odex, oat, jar, class, and aar files. It supports automated analysis with Python and Java scripts.

GDA includes multiple high-speed analysis engines independently researched by the author, including a decompilation engine, vulnerability detection engine, malicious-behavior detection engine, taint-propagation analysis engine, deobfuscation engine, and APK packer detection engine.

The project began in 2013, released its first free version in 2015, and has been maintained since then. Free and Pro versions are available from the official site.