Bell1Dev: Toolsthat teach

Codemade clear

BELL Suite (three apps), ChocoArena, and one project in development.

The projects

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01 / 05BELL Suite · Open source · Apache-⁠2.0

A workbench for open-source contributions that runs on your own computer. An AI agent team builds the change.

You review every file, explain the change back, and approve the pull request yourself. No cloud, no telemetry, no account.

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BELL PR

BELL PR · BELL Suite · Open source · Apache-⁠2.0
A workbench for open-source contributions that runs on your own computer. An AI agent team builds the change. You review every file, explain the change back, and approve the pull request yourself. No cloud, no telemetry, no account. bell-pr.suzu.tw GitHub

BELL Explain · BELL Suite · Private
A personal platform for learning code. Paste code, a concept, an article or a GitHub repo, or upload a PDF, Word or PowerPoint file. It explains step by step, with everyday examples and interactive animations, and saves each note to your knowledge base.

BELL Personal · BELL Suite · Private
One page to open once a day: mail digest, schedule, assignments, upcoming events, to-dos, ideas and habits. AI only suggests; nothing happens until you confirm. It runs on your own host, inside your Tailscale network.

ChocoArena · Live · Sign-up by invite
Community coding challenges in Python, C and firmware (ARM Cortex-⁠M3, RISC-⁠V), each run in an isolated sandbox. Step through C and firmware with a real GDB in the browser and watch memory drawn as the code runs. The Learn area has lessons. chocoarena.com Learn

xxxblock · In development
A new project. Details will appear here when it is ready.

What the BELL apps and ChocoArena have in common.

How we build

Read the blog

localfirst

The BELL apps run on your own computer or host. BELL PR has no cloud, no telemetry and no account.

in numbersNovember 2026

BELL apps

ChocoArenachallenges

ChocoArenalessons

Your AI agent team does the legwork. You understand every change, explain it back, and send only what a maintainer is glad to review.

BELL PR · README

…every C and firmware solution can be stepped through in a real GDB, and memory is drawn for you: stack, heap, pointers and the bytes in between.

ChocoArena · home page

AI only suggests: mail triage, the daily brief and quick notes all start as suggestions and take effect only when you tap.

BELL Personal · README, translated

Every “why” gets an answer you can follow.

BELL Explain · home page, translated

Learn while you contribute, never automatic PRs.

BELL PR · README

Bell1Dev is run by one person.

About Suzu

Suzu is a cybersecurity researcher and CTF player who builds the BELL apps and ChocoArena, and writes about firmware security, vulnerability research and binary exploitation at suzu.tw.

Binary exploitation
Vulnerability research
Firmware security
CTF challenge design
Penetration testing
Security education

Questions, bug reports and ideas are welcome.

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suzu.tw

Cybersecurity research and practical notes by Suzu.

OpenBMC · firmware security · binary exploitation · CTF

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