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Updated: 20 Dec 2025
12 Stars

Blazing-fast, private & open-source SvelteKit LLM chat app

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Overview

Helios is an innovative chat application that prioritizes speed and user privacy, making it an appealing option for those who value data security. Developed for the T3 Chat Cloneathon, Helios boasts a clean and modern design, providing users with a refreshing alternative to traditional proprietary chat clients. Its open-source nature ensures that anyone can contribute to or modify the application, fostering a community focused on continual improvement and user-centric features.

With Helios, you get the benefits of a powerful chat platform while maintaining control over your data. It’s designed for seamless use across devices, ensuring a smooth and efficient chatting experience without compromising on privacy.

Features

  • 100% Client-Side: All chat logic and data storage occur directly in your browser, meaning your messages and settings are never exposed to a server.
  • End-to-End Encrypted Sync: Enjoy the convenience of syncing your chat history across devices without compromising privacy, as all data is encrypted client-side.
  • Bring Your Own Key (BYOK): Flexible integration with any OpenAI API-compatible provider, allowing you to use your own API keys as needed.
  • Temporary Chats: Effortlessly start quick, disposable conversations that won’t be saved, perfect for fleeting discussions.
  • Web Search Support: Enhance your chats by integrating web search capabilities for easy access to information.
  • Message Editing, Thread Pinning & Branching: Improve organization in your conversations with features for editing messages, pinning important threads, and branching discussions.
  • Fast & Clean UI: Designed with SvelteKit, Helios offers a snappy interface that feels modern and responsive.