PromptHub

a browser extension that works as a central point for all your AI prompts, It saves, organizes, and autocompletes your favorite ones.

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Inspiration

We constantly reuse AI prompts — for writing, coding, brainstorming, or research. But there's no easy way to save and revisit them efficiently. Too often, they get lost in chats, documents, or tabs. We wanted a tool that makes prompt recall as simple as saving a bookmark — especially for power users who work with AI daily.

What it does

PromptHub is a minimal browser extension that lets users:

  • Quickly save their favorite prompts
  • View and delete saved prompts from a simple interface
  • Store prompts locally in the browser for persistent access

It's designed as a lightweight utility for writers, developers, students, or anyone who interacts with AI tools regularly and wants a frictionless way to collect and reuse great prompts.

How we built it

We focused on building a fast and functional MVP using:

  • HTML, CSS, and JavaScript for the frontend
  • TailwindCSS for styling a clean and responsive interface
  • Web Extension APIs for compatibility with Chromium-based browsers
  • LocalStorage to persist prompts between sessions without needing a backend

We used tools like GPT-4 and Claude and other AI tools to help scaffold the UI and logic quickly, especially during the initial phase.

Challenges we ran into

  • Learning how to structure and package a browser extension correctly
  • Handling browser security constraints (e.g., Content Security Policy) when dynamically updating UI
  • Working without a backend, while still keeping the user experience smooth and useful
  • Managing scope creep and prioritizing the core user flow (saving and viewing prompts)

Accomplishments that we're proud of

  • Built a working extension MVP from scratch in under 48 hours
  • Designed a clean UI with zero prior browser extension experience
  • Created something genuinely useful for our daily workflows
  • Successfully leveraged AI tools to accelerate development without losing control over code quality

What we learned

  • The structure and permissions system of browser extensions
  • How to manage UI and logic in a somehow CSP-compliant way
  • How helpful AI coding assistants can be for debugging and rapid iteration
  • The power of building small but focused tools that solve real pain points

What's next for PromptHub

  • Add support for folders, tags, and pinned prompts
  • Enable cloud sync using a backend like Supabase
  • Add prompt autocompletion and search
  • Make the UI themeable and keyboard-accessible
  • Publish to the Chrome Web Store
  • Explore a lightweight SaaS model or community prompt-sharing features

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