About st-brainfuck

A Brainfuck interpreter with visual debugger that runs entirely in your browser via WebAssembly.

st-brainfuck features a step-through debugger with tape visualization, configurable cell sizes (8/16/32-bit), and both pre-filled and interactive input modes — making it an ideal tool for learning how Brainfuck works. It also includes a primordial soup simulation inspired by the “Computational Life” paper (arXiv:2406.19108), where populations of BFF programs evolve through pairwise interaction on a spatial grid or via well-mixed random pairing.

Features

• Visual tape debugger with step-through execution
• Configurable cell sizes: 8-bit, 16-bit, 32-bit
• Speed-controlled continuous execution
• Pre-filled and interactive input modes
• Save and share programs via URL
• Example gallery with classic Brainfuck programs
• Primordial soup simulation with spatial grid or well-mixed mode, species tracking, and Shannon entropy
• Configurable mutation rate and tape pre-loading for non-trivial evolutionary dynamics
• Terminal REPL also available (st-brainfuck CLI)

Language Interpreter Series

st-brainfuck is part of the Serbek Technologies Language Interpreter Series:

• st-turtle — Logo turtle graphics interpreter
• st-scheme — R7RS-small Scheme interpreter
• st-forth — Forth interpreter
• st-brainfuck — Brainfuck interpreter with visual debugger (this project)

Support

For questions or issues, visit our contact page.

Built by Serbek Technologies.