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Life & fun · July 2, 2025

Opasm, an Assembly REPL

This is a fun repl for running arbitrary assembly commands, right now it supports x86, X86_64, arm, aarch64, but there's not a big reason that I can't add support for other qemu/capstone/unicorn/ keystone supported architectures, just have to do it

Opasm, an Assembly REPL launched on July 2, 2025 with 26 votes, #693 of 9,223 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.

Visit github.com ↗Opasm, an Assembly REPL alternativestop 8% of July 2025

In plain words

Opasm is a read-eval-print loop for writing and executing assembly code directly. It supports x86, x86_64, ARM, and AArch64 architectures, with potential for adding more through its use of QEMU, Capstone, Unicorn, and Keystone tools. The tool is designed for developers and hobbyists who want to experiment with assembly instructions interactively without setting up a full compilation environment.

written from the facts on this page · September 2026

From the sources

Assembly REPL. Contribute to aedrax/opasm development by creating an account on GitHub.

An interactive assembly REPL built on Unicorn, Capstone, and Keystone. Type instructions, watch them execute, see registers change. Supports x86, x64, ARM, ARM64, MIPS32, MIPS64, PPC32, and PPC64. # requires uv (https://docs.astral.sh/uv/) uv sync uv run opasm Or without uv: pip install -e . opasm What it does You type assembly. It runs. You see what happened. opasm:x64> mov rax, 0x1234 opasm:x64> add rax, 0x5678 opasm:x64> push rax opasm:x64> pop rbx If it's not a command, it's treated as an instruction. Changed values show up bold. The display adapts to your terminal height (registers only at 25+ lines, stack at 35+, code at 45+). arch [name] switch or show architecture registers / reg…from github.com

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