Eureka Buddy Icon Eureka Buddy by Roberto Sánchez
iOS & iPadOS Zero Tracking • Local-First On-Device AI + Knowledge Graph
Eureka Buddy App Icon

Your Books, Alive in a Living Knowledge Flow.

Read naturally while Eureka Buddy quietly writes margin insights, connects ideas across chapters, and backs every answer with instant page citations—all stored privately on your iPhone or iPad.

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01 • Read & Annotate

Margin Notes Appear Right Where You Think

No copy-pasting into a separate chat window. As you read or highlight a passage, Eureka Buddy distills key claims directly in the margin alongside your excerpts and Apple Pencil drawings.

02 • Connect Across Chapters

Pages Dissolve into a Visual Knowledge Graph

Ideas in early chapters automatically link to proofs and conclusions hundreds of pages later. Explore your book as a living map of concepts rather than a flat list of pages.

03 • Ask & Verify Instantly

Every Answer Anchored to the Exact Page

Ask complex questions across your entire book. Every answer includes tappable page badges that jump straight back to the source paragraph—with zero data leaving your device.

Eureka Buddy Studio — iPadOS
Chapter 4 • Cognitive Memory p. 87

Isolated page notes often lose their broader context. Linking margin annotations directly to a book-wide concept map transforms how knowledge is retained.

✨ AI Margin Note • p. 87

Key Insight: Links this passage on p. 87 directly to the definition in Ch. 2 (p. 34).

Whole-Book Knowledge Graph 3 Chapters Linked
Ch. 2 Def Margin p.87 Theorem 4 Ch. 7 Proof
✓ Grounded Book Synthesis Verified Citations

"The book demonstrates that connecting margin notes to a concept graph bridges early definitions in Chapter 2 with empirical proofs in Chapter 7."

📖 Page 34 (Ch. 2) 📖 Page 87 (Ch. 4) 📖 Page 142 (Ch. 7)
Interactive Workflow Explorer

Tap Any Pillar to Inspect How Eureka Buddy Works

ZERO TELEMETRY • LOCAL CONTAINER

Nothing Leaves Your iPhone or iPad

Run Apple Intelligence or downloadable local models completely offline. Want to connect to your own Mac or PC over Wi-Fi or Tailscale with LM Studio, or bring your own Gemini or Claude API key? You stay in complete control.

Progressive Feature Breakdown

Hover or Tap Any Card to Unfold Details

Clean and calm at a glance—with rich capability details revealed as you explore.

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On-Device AI & Zero Tracking

Run Apple Intelligence or downloadable local models directly on your device, with Apple Vision OCR for scanned PDFs.

  • No accounts, no backend servers, no analytics
  • All PDFs, notes, and indexes stay in your device container
  • Optional LM Studio over local Wi-Fi or Tailscale
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Knowledge Graph & Smart Retrieval

Understand how ideas connect across an entire book—not just isolated pages—with fast, high-precision answers grounded in your text.

  • Interactive visual map of key concepts and relationships
  • Exact page citations you can tap to verify every answer
  • Synthesizes insights across chapters in seconds
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AI Margin Notes, Excerpts & Drawings

Annotate naturally with excerpts, Apple Pencil drawings, and AI-generated margin notes right alongside your text.

  • Instant lookup of related academic papers and articles
  • Clean mathematical formula rendering and study exports
  • Optional Gemini & Anthropic Claude support with your own key