Helios is a blazing fast, privacy-first LLM chat client built for the T3 Chat Cloneathon. It is fully open source and designed to be a clean, modern alternative to proprietary chat clients, with a focus on user privacy and flexibility.
- 100% Client-Side: All chat logic and data storage happens in your browser. No server ever sees your messages or settings.
- End-to-End Encrypted Sync: Sync your chat history and settings across devices with client-side encryption. The sync server never sees your data, and you don't need to register or provide an email—just use a passphrase.
- Bring Your Own Key (BYOK): Compatible with every OpenAI API-compatible provider. Use your own API keys for maximum flexibility.
- Temporary Chats: Start quick, disposable conversations without saving anything.
- Web Search Support: Integrate web search into your chats.
- Message Editing, Thread Pinning & Branching: Edit messages, pin important threads, and branch conversations for better organization.
- Fast & Clean UI: Built with SvelteKit for a snappy, modern user experience.
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Clone the repository
git clone https://github.com/helioschat/helios.git cd helios -
Install dependencies
bun install
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Run the development server
bun run dev
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Open http://localhost:5173 in your browser
Helios was created in 10 days for the T3 Chat Cloneathon, an open source competition to build the best clone of the T3 Chat product.
This project is licensed under the MIT License. See LICENSE for details.