ARM Lab

Write, assemble, link, and really run ARM assembly directly on your Android phone — then step through it in a built-in debugger.

Features Real on-device execution. Your assembly is assembled with as, linked statically with ld, and run as a real Linux process on the phone's CPU — not an emulator. Two architecture modes arm64 (AArch64) — works on virtually every modern phone. arm32 (ARMv7) — for older devices. Note: many phones from ~2023 onward are 64-bit-only and physically cannot run 32-bit code; on those, arm32 mode reports a clear "unsupported on this CPU" message. Two ways to write code Text editor — type assembly directly. Visual blocks — drag instruction blocks and plug register/immediate/label operands into their slots; the blocks generate assembly for you. Debugger — single-step, breakpoints, and live views of registers, flags, and memory.