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ContextBridge – Local RAG Companion
A privacy-first Chrome extension that indexes web pages into local Markdown and lets you ask questions using local or cloud AI in your sidebar, fully offline.
Overview
ContextBridge – Local RAG Companion is a privacy-focused Chrome extension that transforms how you interact with web content. It parses any web page into clean Markdown and stores it locally in your browser's IndexedDB, ensuring your data never leaves your device. With a built-in sidebar, you can ask questions about your indexed pages using a variety of AI models: local Ollama for complete offline use, or cloud-based Claude, OpenAI, or Gemini (API keys required). No backend server is needed – everything runs on your machine. Perfect for researchers, students, and privacy-conscious users who want to build a personal knowledge base without compromising security.
Key Features
Parses web pages into clean Markdown format
Stores all data locally in IndexedDB for full privacy
Supports local Ollama models for offline use
Supports cloud models: Claude, OpenAI, and Gemini
Sidebar Q&A interface for asking questions about saved pages
No backend required, works 100% offline with local models
Index and search across all saved pages
Pros & Cons
Pros
- arrow_right + 100% privacy-first, data stays on your device
- arrow_right + Supports multiple AI models (local and cloud)
- arrow_right + Fully functional offline with local models
- arrow_right + No backend or server setup required
- arrow_right + Convenient sidebar interface for quick Q&A
Cons
- arrow_right - Only available as a Chrome extension (no Firefox or Safari yet)
- arrow_right - Requires separate installation of Ollama for local models
- arrow_right - Cloud models need API keys with potential costs
- arrow_right - Indexing is limited to pages you browse and manually save
Pricing Details
ContextBridge is free to use. There are no subscription fees or hidden costs. You only need to provide your own API keys for cloud-based models (Claude, OpenAI, Gemini) or run local models via Ollama (no cost). The extension itself is fully functional offline with local models.
FAQ
How does ContextBridge ensure privacy?
expand_more| All parsed data is stored locally in your browser's IndexedDB. No data is sent to any external server unless you choose to query a cloud AI model with your own API key.
Which AI models are supported?
expand_more| ContextBridge supports local Ollama models (e.g., Llama 2, Mistral) and cloud-based models from OpenAI (GPT-3.5, GPT-4), Anthropic (Claude), and Google (Gemini).
Can I use ContextBridge offline?
expand_more| Yes, if you use local models via Ollama, the extension works completely offline without internet access.
Is there a limit on the number of pages I can index?
expand_more| The storage limit depends on your browser's available space for IndexedDB, but it can typically hold thousands of pages.
Do I need to install additional software?
expand_more| For cloud models, no extra software is needed. For local models, you need to install Ollama separately and download models.
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Smart Alternatives & Comparison
Compare ContextBridge – Local RAG Companion side-by-side with other leading tools in the same category.
| Criteria |
ContextBridge – Local RAG Companion
This Tool
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| Overview | A privacy-first Chrome extension that indexes web pages into local Markdown and lets you ask questions using local or cloud AI in your sidebar, fully offline. | 100+ AI tools for your classroom, customizable in 3 steps. Built by educators. |
| Pricing Model | Freemium | Freemium |
| Community Rating |
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0.0
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| Developer API | cancel Not Available | cancel Not Available |
| Open Source | lock Proprietary | lock Proprietary |
| Action | Visit Web open_in_new |
