ContextBridge

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ContextBridge — AI Continuity Tool

Export, save, and port your AI conversations across platforms — instantly, with no login.

Inspiration

As AI becomes a core part of daily work, conversations hold real intellectual value — decisions, code, research, drafts. Yet every major AI platform traps that value inside a single session. There's no clean way to save, share, or continue a conversation elsewhere.

We built ContextBridge to solve exactly that — making AI conversations permanent, portable, and productive.

What It Does

ContextBridge is a Chrome extension that sits on top of every major AI platform and lets you export, save, and port conversations in clean, structured formats — instantly, with no login.

It supports 8 AI platforms:

  • Claude
  • ChatGPT
  • Gemini
  • Grok
  • DeepSeek
  • Mistral
  • (and more)

The extension injects a one-click export button directly into the AI chat UI and outputs:

Output Description
PDF Clean, properly formatted — solves the Ctrl+P problem
Markdown Structured output for Notion, Obsidian, GitHub, docs
JSON Structured data for analysis, archiving, integrations
Plain Text Universal, works everywhere

Additional features:

  • Context Continuity — export context and resume on a different AI platform without re-explaining anything
  • Live Token Indicator — shows how much context window remains per platform
  • Artifacts Export — exports Claude artifacts (code, documents) alongside the conversation
  • Configurable Settings — toggle timestamps, artifacts, and floating button visibility

How We Built It

ContextBridge is a lightweight, privacy-first Chrome extension built entirely on client-side technologies.

Architecture

Layer Technology
Extension Framework Chrome Manifest V3
Content Scripts Vanilla JavaScript — injected into each AI platform
Popup UI HTML + CSS + JavaScript
Background Worker Chrome Service Worker
Storage Chrome Local Storage (no server, no backend)

Platform Support

Each AI platform has a dedicated extraction function that handles its unique DOM structure:

claude.ai          → extractClaude()
chatgpt.com        → extractChatGPT()
gemini.google.com  → extractGemini()
grok.com           → extractGrok()
chat.deepseek.com  → extractDeepSeek()
chat.mistral.ai    → extractMistral()

Export Pipeline

User clicks Export
  → Content script extracts conversation from DOM
  → Messages deduplicated and sorted by DOM order
  → Token count estimated per platform
  → Output formatted (MD / JSON / PDF / CSV / TXT / Image)
  → Background service worker triggers download

Challenges We Ran Into

  • Each AI platform has a completely different DOM structure — extraction logic had to be built and maintained per platform
  • PDF generation without a backend — had to solve clean, chrome-free PDF rendering entirely client-side
  • Token estimation varies across platforms — had to reverse-engineer approximate context window sizes per model
  • Ensuring the floating export button doesn't conflict with each platform's existing UI
  • Handling dynamic content loading where messages render asynchronously

Accomplishments We Are Proud Of

  • Built a single extension that works across 8 AI platforms — no separate tools needed
  • Solved the Ctrl+P problem — generating clean, properly formatted PDFs from any AI chat
  • Achieved true cross-platform context portability — take a Claude conversation and continue it on ChatGPT
  • Zero backend, zero login, zero data collection — everything runs locally in the browser
  • Live token usage awareness across all supported platforms
  • Clean export of Claude artifacts alongside conversation text

What We Learned

  • Browser extension development requires deep DOM knowledge — no two platforms render the same way
  • Privacy-first architecture is a feature, not a constraint — users trust local-first tools more
  • The Ctrl+P problem is bigger than it looks — it affects everyone using AI for professional work
  • A good UX default (floating button, one-click export) drives adoption more than feature depth
  • Token limits are invisible to most users — surfacing them creates immediate, tangible value

Revenue Model

Month 1: Fully Free (No Credit Card Required)

  • All features unlocked for 30 days
  • Goal: build habit, drive word-of-mouth, remove adoption friction

Freemium Tiers (Post Month 1)

Tier Price Key Limits
Free $0/month 3 PDFs/day, branding on exports
Starter ~$1.98/mo (yearly) 30 PDFs/day, no branding, Mute Export, multi-device
Standard ~$2.98/mo (yearly) 100 PDFs/day, all features, developer support

What's Next for ContextBridge

  • [ ] Notification when context limit is almost full — alert before you lose mid-conversation context
  • [ ] Smart Summarization Before Export — auto TL;DR at the top of every export
  • [ ] AI Support for Better Prompt Writing — real-time prompt suggestions as you type
  • [ ] ContextBridge Wrapped — monthly/yearly visual report of your AI usage (Spotify Wrapped for AI)

Tech Stack

Extension Framework  → Chrome Manifest V3
Content Layer        → Vanilla JavaScript (per-platform extraction)
Popup UI             → HTML + CSS + JavaScript
Background Worker    → Chrome Service Worker
Data Storage         → Chrome Local Storage (fully client-side)
PDF Generation       → Client-side rendering (no backend)
Platforms Supported  → Claude, ChatGPT, Gemini, Grok, DeepSeek, Mistral

Built for everyone who uses AI seriously — and deserves to own their conversations.

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