OmniChat: A Zero-Backend AI Chat PWA with Local AES-GCM Encryption. #showdev, #open-source, #javascript, #ai

Abhinav Arnav — Mon, 24 Aug 2026 16:17:09 +0000

Hey everyone! 👋

I wanted to share a project I've been working on called OmniChat.

I built it because I wanted a lightweight, unified web client to test different LLM providers (like Gemini, Groq, Anthropic, and others) without routing my personal API keys or chat logs through an unknown third-party backend server.

GitHub Repository: https://github.com/abhinavarnav314-collab/OMNICHAT4
Live Demo: https://abhinavarnav314-collab.github.io/OMNICHAT4/

How It Works & Architecture

Zero Backend: The application is entirely client-side. It is built as a Progressive Web App (PWA) using React, TypeScript, and Vite. There is no central server handling user data.
Client-Side Encryption: All API keys are securely encrypted and stored locally in the browser's IndexedDB using AES-GCM. Your credentials never touch an external server.
Direct Browser Endpoints: Supports direct integration with providers that allow browser-side requests (such as Google Gemini and Groq).

Key Features

Multi-Model Comparison: Test and compare responses side-by-side.
Local Prompt Vault: Store and version reusable prompts directly in your browser.
Offline Ready: Utilizes a Service Worker to cache assets so the app functions reliably offline.

What I'd Love Feedback On

Since this is heavily focused on privacy and client-side execution, I would love technical critiques or suggestions regarding:

The security model for handling local browser encryption storage (IndexedDB + AES-GCM).
Edge cases with PWA caching and service worker lifecycle management.

Try out the live demo, take a look at the code, and let me know what you think! All feedback and contributions are welcome. 🚀

DEV Community: Abhinav Arnav

OmniChat: A Zero-Backend AI Chat PWA with Local AES-GCM Encryption. #showdev, #open-source, #javascript, #ai

How It Works & Architecture

Key Features

What I'd Love Feedback On