My 6~7 Brain — Privacy-first knowledge management

The problem

Modern professionals are flooded with information — emails, meeting notes, ideas, to-dos and messages scattered across dozens of apps. Finding what you need costs time and frustration. Existing AI tools promise a solution, but require you to send all your personal data to the cloud. For privacy-conscious users, that's not an option.

The solution

My 6~7 Brain is a privacy-first iOS app that captures all your thoughts, notes and memories and makes them intelligently searchable — entirely on-device, without a single byte going to external servers.

• Multiple capture methods: type, dictate via voice transcription, or connect your email and calendar — everything comes together in one place.
• On-device AI: semantic search and AI chat run locally on your iPhone via Core ML and MLX Swift (Phi-4-mini / Llama 3.2). Your data never leaves your device.
• Knowledge graph: the app automatically discovers connections between your ideas and shows them visually, so you spot patterns you would otherwise miss.
• Weekly insights: AI-generated summaries of your moods, productivity and recurring themes — without any effort on your part.
• Apple ecosystem: Apple Watch app for quick capture, Home & Lock Screen widgets, iCloud sync and Face ID / Touch ID security.

Results

What makes this project special

• Privacy by design: no compromises — all AI models run locally on the device via Apple's Core ML framework.
• Full app development: from concept and UX design to Swift 6 / SwiftUI implementation, including an Apple Watch app and widgets.
• Complex integrations: Gmail, Outlook, EventKit and iCloud/CloudKit — all connected into a seamless experience.
• Scalable AI model: the system can run both on-device (privacy mode) and via API (cloud mode), depending on the user's preference.