About PromptShifu

Our mission, local-first privacy architecture, journey, and how to reach us — the team behind PromptShifu (formerly PromptCat).

🎯 Mission

PromptShifu Free AI Prompt Manager exists to make AI prompt management effortless, private, and portable. We believe that the prompts you craft are valuable intellectual property—they deserve a secure home that works across ChatGPT, Midjourney, Claude, DeepSeek, and any future AI tool you adopt.

Our mission is to give every AI practitioner a side-panel command center where they can organize, refine, and inject prompts without leaving the workflow, without uploading data to the cloud, and without paying for features that should be free.

🔒 Local-First Privacy Architecture

Privacy is not a feature—it is the foundation of PromptShifu. The extension stores all prompts, variables, settings, and usage history locally in your browser using IndexedDB and Chrome Extension storage APIs.

Zero cloud uploads by default. We do not run a backend that reads your prompt library. Your data never transits through our servers. Optional Google Drive sync is available for backup and cross-device use, and it uses your own Google account via OAuth with the minimum required scopes.

Side-panel quick access. PromptShifu lives in the browser side panel, so your prompt library is one click away while you work with your favorite AI platforms. No tab switching, no copy-paste fatigue.

🚀 Our Journey

2024

Project Started

PromptShifu began as a personal productivity tool to organize ChatGPT and Midjourney prompts without relying on cloud note-taking apps.

Early 2025

Chrome Web Store Launch

Released the first public version with one-click prompt injection, visual library cards, and local-first storage.

Mid 2025

Magic Reverse & Share Link Generator

Added AI-powered image-to-prompt reverse engineering and shareable prompt links with QR codes.

2026

Project Alexandria (v3.0)

Introduced folder-based organization, smart variables, browser side-panel integration, and optional Google Drive sync.

👥 Team

🥷

CY — Founder & Chief Architect

PromptShifu · Browser Extension · AI Workflow Engineering

CY founded PromptShifu to solve a problem every heavy AI user faces: prompts scattered across tools, lost context, and no real privacy. As the chief architect, CY designed PromptShifu's local-first, privacy-by-default architecture — your prompts stay on your device unless you explicitly enable Google Drive sync.

With deep experience in browser-extension development and secure client-side storage, CY leads product direction, open-source strategy, and the PromptShifu organization's commitment to data sovereignty.

GitHub → @cy0007 · Open Source

❓ About PromptShifu

Why does PromptShifu insist on a local-first architecture?

Because your prompts are valuable knowledge assets. PromptShifu stores all your prompts, variables, and usage records locally in your browser — by default nothing is uploaded to the cloud or passes through our servers, so you retain full control of your data.

Is PromptShifu an open-source project?

Yes. PromptShifu's core development and ecosystem are maintained openly on GitHub — follow our progress, report technical issues, or contribute code at github.com/cy0007.

Who is the team behind PromptShifu?

PromptShifu was founded by CY (Chen Yuan), who serves as chief architect and focuses on browser extension development and secure client-side storage while leading product direction and open-source strategy.

Get in touch

Have a question, bug report, or partnership idea?
We read every email and typically respond within 48 hours.

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Last Updated: August 26, 2026 · v3.1.0