Executive Summary
Zettle Notes is a cross-platform, feature-rich note-taking app. It uniquely combines markdown editing, real-time synchronization, advanced Excalidraw-based diagramming, AI-powered voice transcription, and robust security—delivering a seamless experience on desktop (Windows, macOS, Linux) and mobile (iOS, Android).
Problem Statement & Market Opportunity
- Fragmented Workflows: Users juggle multiple apps for text notes, diagrams, and voice memos—leading to context switching and data silos.
- Privacy Concerns: Cloud-only solutions expose sensitive data.
- Platform Inconsistency: Many tools lack parity between desktop and mobile UX.
- Scalability & Offline Needs: Professionals require fast access and offline support for large note repositories.
Opportunity: A single, secure, offline-first app that natively integrates text, diagrams, and voice with real-time sync fills a critical gap.
Solution Overview
- Unified Workspace: Inline markdown editor, embedded diagrams, multimedia, and voice capture in one app.
- Cross-Platform Parity: Specific codebase for each platform, consistent UX across desktop and mobile.
- Offline-First Architecture: Local first storage with automatic sync (paid).
- Privacy & Security: AES-256 encrypted local storage and more advanced security to come.
- AI Augmentation: On-device Whisper transcription and future AI-driven summarization.
AI/ML: Whisper Integration
- Local: ONNX or PyTorch Mobile via FFI for privacy.
- Server-side: Optional hosted transcription with SSL/TLS encryption.
Key Features
- Real-time markdown editing with live preview.
- Embedded Excalidraw diagrams with full feature set.
- AI-powered voice transcription with Whisper.
- Local-first storage with optional sync.
- Dark/light mode support.
- Keyboard shortcuts for all major actions.
Settings
- Theme preferences (dark/light).
- Sync settings (enable/disable).
- AI model preferences.
- Keyboard shortcut customization.
Security & Privacy
- Zero-knowledge architecture: We never store your decryption keys.
- End-to-end encryption for all data.
- No data sharing with third parties.
- Local-first storage with optional sync.
Conclusion
Zettle Notes delivers a powerful, secure, and versatile note-taking platform that unifies text, diagrams, and voice in a single app. Its modular architecture, offline-first design, and AI-enhanced features position it to redefine productivity workflows across devices.