Rebranded & Redesigned v2.0

Universal Annotation Layer for AI Chats

Chinh is a premium browser extension that lets you highlight, annotate, and organize knowledge directly inside ChatGPT, Claude, Gemini, and Perplexity. Maintain full ownership of your data with our local-first vault architecture.

Install Extension Try Live Demo

chatgpt.com/c/quantum-computing-intro

Can you explain how Quantum Computing works in simple terms?

Quantum computers process information differently than classical computers. While a classical bit represents 0 or 1, quantum computers use qubits which can exist in a state of superposition—representing 0, 1, or both simultaneously. This allows them to compute complex scenarios at speeds classical hardware cannot match.

Designed for AI Power Users

Annotate your thoughts, backup your research, and keep full local control over your knowledge base.

Universal Overlay

Works seamlessly across all major AI platforms: ChatGPT, Claude, Gemini, and Perplexity. No custom adapters needed; it scales with your workflow.

Local Vault Storage

Own your data entirely. Write backup copies of your annotations directly to any local directory on your machine using the HTML5 File System Access API.

Structured Search & Tags

A central options dashboard gives you a powerful notes grid. Filter notes instantly by platform, customized tags, or background highlight colors.

Interactive Playground

Try the Chinh annotation experience live on this page. Highlight text in the chat bubble below to create your first note.

STEP 1: Click on a dotted phrase in the message below

Claude AI

To build successful products, always focus on solving a real user pain point. Next, ensure your user experience is extremely simple and low-friction. Finally, iterate rapidly based on continuous user feedback instead of guesswork.

Chinh Notes Grid (Live Preview)

Your saved annotations will appear here.
Select a phrase on the left to start.

Privacy by Architecture

Typical extensions send your data to centralized cloud databases. Chinh is built from the ground up to respect your ownership.

100% Local Control

With Chinh's Local Vault, your annotations are written directly to a folder on your physical hard drive. The browser never uploads your notes, keeping your intelligence safe from data leaks, telemetry tracking, and third-party monetization.

HTML5 File System Access API: Clean, native integration without complex backend storage.
Zero-Cloud Dependency: Your notes survive even if the extension is uninstalled or you switch computers.
Atomic File Writes: Double-verified writes using temporary check buffers prevent file corruption.

Feature	Standard Cloud Sync	Chinh Local Vault
Data Ownership	Server Provider	100% User Owned
Security Leak Risk	High (Cloud Database)	Zero (Local Disk)
Offline Availability	No	Yes (Offline First)
Telemetry Tracking	Enabled by default	None
Uninstall Recovery	Depends on account	Instant (Import Backup/Vault)

Frequently Asked Questions

Everything you need to know about the Chinh extension.

Chinh currently integrates directly with ChatGPT, Claude, Gemini, and Perplexity. It dynamically coordinates with their layout engines to attach annotations to specific conversation coordinate states.

When you enable the Local Vault, the browser requests directory write permissions for a folder on your hard drive. Chinh then writes atomic, human-readable JSON files representing your notes. When you restart your browser, simply unlock the vault to resume real-time sync.

No. Chinh reads highlighted text strictly locally inside your active browser tab to locate the coordinate context. No conversation texts, metadata, or notes are ever transmitted to our servers.

To migrate, simply download the extension on your new machine, click "Setup Local Vault", and select the same backup folder from your hard drive (or import your exported `.json` backup file). Chinh will automatically index and restore your entire workspace in seconds.

Take Control of Your AI Notes

Install Chinh today to highlight, annotate, and secure your learning workflow across ChatGPT, Claude, Gemini, and Perplexity.

Install from Chrome Web Store