APK Easy tool provides compilation, decompilation, management, and signing of '.apk' files.
Ranked in these QuestionsQuestion Ranking
Pro Can look inside and modify an APK
The user interface is easy to use as every relevant option is on the main screen. The drag and drop function allows you to quickly change a file for a modified one and then recompile the APK for testing by deploying it on a smartphone or an emulator.
Pro Can be used online
A web version is available here.
Pro Is actively supported
The developer regularly fixes bugs and solves issues in the software. See changelogs here.
Pro Allows signing
Android OS requires the app to be signed, this can be done with this tool.
Con Third party dependencies
You need to download and install .NET Framework >4.6.2 and Java SE/JDK.
Con No built-in code viewer/editor
A third party text editor or IDE is necessary to see and edit the files inside the decompiled APK.