Lumina: your second brain

Lumina – Your Ideas, Connected

Lumina is a private, local-first second brain that helps you capture your thoughts, connect ideas, and rediscover everything you’ve learned — instantly.
All processing happens on your device. Your data stays yours.

Think. Capture. Connect.

Write notes, record voice memos, scan text, or import information — Lumina automatically identifies names, concepts, and entities and links them together for you.

Built-in offline AI lets you search and understand your knowledge base with natural language, without sending anything to the cloud.

A Smarter Way to Remember

Entities & Connections – Lumina detects people, places, topics, and ideas across your notes and maps how they relate.

AI Search (Offline) – Ask questions in your own words and get accurate answers powered by a local LLM.

Voice & OCR Capture – Transcribe audio or extract text from images quickly and privately.

Knowledge Graph – Visualize how your notes and ideas connect. Explore your mind like a map.

Simple by Design – No folders, no friction. Just capture and let Lumina organize.

Private & Local – Notes, embeddings, AI models — everything stays securely on your device.

Optional iCloud Backup – Encrypted, effortless backups to restore your knowledge on a new device.

Export Anytime – Your data is yours. Export it in an open format whenever you want.

Built for People Who Think Better with Connections

Lumina is perfect for:

Students & lifelong learners

Writers, researchers, creators

Professionals with lots of ideas

Anyone who wants a simple, powerful second brain

People who value privacy above everything else

No subscriptions. No ads. No tracking.

Lumina is free to use. If you enjoy it, you can support development directly from the app.