Co Reader

co-reader — your paragraph-level reading companion

Stop skimming. Start understanding. co-reader analyzes any article and gives you a synchronized reading guide in a side panel — one-sentence summaries for every paragraph, key phrase highlights, and cross-references between related sections.

HOW IT WORKS
1. Open any article and click the co-reader icon
2. Click "Start" to analyze the page
3. Summaries appear in the side panel as chunks are processed
4. Click a summary to jump to that paragraph — key phrases light up automatically
5. Click a paragraph in the article to sync the panel back
6. Cross-reference links connect related paragraphs

FEATURES
• One-sentence summaries for every paragraph
• Key phrase highlighting directly on the article
• Cross-references between related paragraphs
• Synchronized scrolling — article and panel stay in sync
• Chunked processing with live progress bar
• Works on any article, blog post, or long-form content

BRING YOUR OWN KEY
co-reader has no backend. Your API key stays in your browser. Choose your LLM:
• Anthropic (Claude)
• OpenAI (GPT-4o, GPT-4.1)
• Google Gemini
• OpenRouter (access to 100+ models)
• Chrome Built-in AI / Gemini Nano (free, on-device, beta)

PRIVACY
Only paragraph text is sent to your chosen LLM provider. No URLs, no personal data, no tracking, no analytics. Your API key is stored locally and never leaves your browser.

OPEN SOURCE
co-reader is open source: https://github.com/msanvido/co-reader