Gisty – Instant Text Summarizer

Gisty is a simple web app that uses Chrome’s Gemini Nano AI to instantly summarize text or webpages, helping users quickly grasp the main idea — fast, smart, and built for productivity.

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Inspiration

I was inspired by the idea of making information easier to digest. Many times we encounter long articles or documents and just want the key points quickly. I wanted to build a lightweight tool that could summarize text instantly, using the latest AI technologies available directly in the browser.

What it does

Gisty is a web app that summarizes any text in 3–5 sentences. It leverages Chrome’s Built-in AI (Gemini Nano) for on-device summarization, keeping the process fast and private. When Gemini Nano isn’t available, Gisty gracefully falls back to a local demo summarizer, ensuring it works for everyone.

How we built it

We built Gisty using HTML, CSS, and JavaScript, keeping it lightweight and beginner-friendly. The app interacts with the Chrome Built-in AI APIs (window.ai.createTextSession() and window.ai.canCreateTextSession()) when available. For unsupported browsers or users without Early Preview access, it uses a dummy local summarizer. The UI is responsive and includes a “Copy Summary” button for convenience.

Challenges we ran into

  • Chrome’s Built-in AI APIs are still experimental, so window.ai isn’t available to all users yet.
  • Configuring Chrome Canary and enabling the right flags required trial and error.
  • Designing a simple, clean UI that is easy to use and looks polished within a short timeframe.

Accomplishments that we're proud of

  • Built a fully functional web app ready to use with Gemini Nano.
  • Implemented a fallback summarizer so the app works immediately for anyone.
  • Created a user-friendly, responsive interface with minimal code.

What we learned

  • How to interact with Chrome’s new on-device AI APIs.
  • Feature detection and graceful fallback techniques for experimental APIs.
  • Building beginner-friendly web apps with clean design and usable functionality.

What's next for Gisty

  • Full Gemini Nano integration once Early Preview access is granted.
  • To develop it into a Chrome Extension to summarize text directly from any webpage.
  • Expand features to include AI-based rewriting, tone change, or translation.

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Updates

posted an update —

Update – Gisty

Date: 2025-10-19

Changes Made

  • Added detection for Google Chrome’s built-in AI (Gemini Nano) using window.ai.createTextSession.
  • Implemented AI availability check with fallback to a dummy summarizer if not supported.
  • Added status message to inform users whether Chrome AI or fallback mode is active.
  • Improved error handling and user feedback during summarization.
  • Added “Copied!” confirmation when copying the summary.

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