I built SilentGPT – a terminal-based ChatGPT client in C with encrypted chat history

Hi all, I'm SilentPuck.

I wanted a way to interact with GPT models from the terminal, fully offline (except API calls), with:

• zero telemetry
• encrypted local history
• multiple token profiles
• written in pure C

So I built SilentGPT – a single-binary CLI chat client that does exactly that.

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🔐 Why?

I didn't want to depend on Electron, Python, or any browser interface.

I just wanted a quiet, minimal, encrypted tool that I could trust on any Linux machine — even in airgapped environments.

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🧠 Features

• Pure C implementation
• Single portable binary (depends only on OpenSSL and libcurl)
• AES-256-GCM encryption for chat history and tokens
• Multiple tokens via --token
• Optional password mode with SHA-256 derived key
• /list, /load, /rename, /delete, /export all from CLI
• No OpenAI logging – raw curl requests only

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🛠 Build

sudo dnf install openssl-devel libcurl-devel
make
./silentgpt --token test --secure

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GitHub: SilentGPT

🧭 Philosophy

Tools for invisible people.
With silence and precision.
No tracking. No noise. Just control.

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💬 Feedback

I'm open to feedback, questions, or suggestions. This is my first major open C project — would love to hear your thoughts.

Silent and precise. — SilentPuck