Pure frontend
Unpacking, parsing, execution and rendering all run inside the browser. No backend, no device, no emulator.
apk.jsRun Android APKs in the browser
Parse DEX, interpret bytecode, paint the UI on Canvas — all in plain JavaScript.
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DEX interpreter
Executes Dalvik bytecode with exception handling, switch, arrays, fields and method dispatch.
Canvas framework
A growing subset of the Android Framework renders Activity, View, layout, widgets, drawables and themes.
Resource fidelity
Reads binary AndroidManifest.xml and resources.arsc directly, so themes and strings come from the APK itself.
Small API surface
createSimulator gives you device sizing, file loading and log callbacks. Drop it on any static page.
Debug renders
tools/render-apk.mjs runs a real APK through node-canvas and writes a PNG for visual comparison.