Pebble

With Pebble, every webpage becomes a lesson. It turns online browsing into discovery for kids — using AI to simplify text, translate pages, and generate quizzes, making learning both fun and safe.

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Inspiration

Kids spend a huge amount of time online — browsing videos, articles, and websites every day. But most of this content is not designed for them: it’s written for adults, filled with complex ideas, or sometimes even unsafe.

The Problem

  • Children miss out on valuable knowledge because content is too complex.
  • They risk encountering inappropriate or unsafe material.
  • Valuable screen time is often spent without meaningful learning.

The Solution

Since kids are already spending so much time browsing, we should leverage today’s advanced technology to turn those moments into opportunities for safe learning.

Pebble was created to do exactly that. It:

  • Rewrites complex ideas into clear, age-appropriate language
  • Rephrases sensitive words to ensure content safety
  • Translates text into a child’s preferred language
  • Adds a gamified learning panel with quizzes and fun facts

With Pebble, everyday browsing becomes a safe, engaging, and educational journey — ensuring no click goes to waste.

What It Does

Pebble is a Chrome extension that makes ordinary browsing safe and kid-friendly. Built on Chrome’s built-in Gemini Nano AI, Pebble works entirely offline to ensure privacy and smooth performance.

It provides three main features:

  • Rewrite content (Rewriter API + Summarizer API):

    • Simplifies complex text into kid-friendly language at three reading levels (simple, intermediate, advanced).
    • Difficult or sensitive ideas are softened but meaning is preserved.

  • Translate content (Translator API):

    • Converts content into a child’s preferred language, including rewritten text, making it accessible for bilingual learners.

  • Gamified learning panel (Prompt API + Summarizer API):

    • Auto-generates quizzes, fun facts, and page summaries to reinforce comprehension.
    • Kids earn points, badges, and levels for progress, encouraging self-directed learning.

All quizzes and facts are stored locally, so kids can always review what they’ve learned. By using Chrome’s local AI, Pebble ensures safety, privacy, and accessibility for children.

How I Built It

Pebble combines Chrome’s Gemini Nano with multiple built-in APIs: Rewriter API, Summarizer API, Translator API, and Prompt API.

Together, these enable:

  • Chunking and processing webpage content intelligently
  • Safe filtering of violent or sensitive ideas into age-appropriate language
  • Accurate rewriting, summarization, and translation while preserving meaning
  • Generating insightful fun facts and context-related quizzes
  • Seamless integration into any webpage with a simple UI

Our design focused on two principles: learning accessibility and content safety. Every feature, from progressive rewriting to gamified quizzes, was designed to make learning simple, engaging, and safe for kids.

Challenges I Ran Into

  • Balancing simplification with meaning:
    I iterated prompts many times to ensure rewritten content stayed accurate while removing harmful details.

  • Performance:
    Large pages slowed down rewriting, so I optimized batching and caching to make it faster.

  • Engagement design:
    Creating a UI that keeps kids motivated (badges, quizzes, facts) without distracting them was a key challenge.

Accomplishments That We’re Proud Of

  • Built a privacy-first AI extension where all learning happens offline and data stays on the local device.
  • Designed adaptive rewriting levels that adjust complexity for different ages.
  • Created a gamified panel that makes reading interactive and fun.

What I've Learned

  • Gemini Nano is powerful but local:
    I've learned how to fully leverage Chrome’s built-in Gemini Nano AI to process rewriting, summarization, translation,
    and prompting entirely offline. This ensures privacy and makes the extension reliable without external servers.

  • Prompt engineering matters:
    With Gemini Nano, the way I structured prompts directly shaped output quality — from making content safe for kids
    to balancing simplification with accuracy.

  • AI for real-world use cases:
    I saw firsthand how Gemini Nano can turn everyday browsing into safe, personalized learning experiences,
    proving that local AI can be practical, lightweight, and child-friendly.

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