ClassyShark is a standalone Android diagnosing tool developed by Boris Farber, Developer Advocate at Google. ClassyShark serves as an Android executable browser, and is a valuable tool to navigate through Android classes and their internals: class interfaces and members, dependencies, dex structure and counts, and so on. ClassyShark has been released under the Apache 2.0 license, and it can be freely downloaded from https://github.com/google/android-classyshark.
ClassyShark is a useful tool when it comes to analyzing the inner content of an Android APK, and diagnoses problems early that might happen due to multidex or dexing problems, dependencies and sub-libraries being added, circular dependencies, and problems with native code.