Folium

What it is

Folium is an AI notebook for people who think in pages.

Other note apps store. Folium synthesizes.

Drop in an article, paste a voice memo, photograph a page, or just type a thought — Folium asks the LLM you choose to extract the ideas and weave them into a private wiki of interlinked concept, person, and project pages. The wiki compounds. The more you read, the more your second brain knows.

Features

• Markdown files on disk are the source of truth — open them in any text editor, edit them in Vim, sync them via iCloud Drive
• Paragraph-level citations on every Ask answer — no more “trust me, the AI said so”
• 13 LLM providers: Claude, GPT, Gemini, Qwen, DeepSeek, Kimi, GLM, Doubao, Hunyuan, Ollama (local), and more — bring your own key (sign up and purchase from each provider yourself), never touches our servers
• Capture modes: type, voice transcript, photo OCR (Chinese + English), drag-drop URL/PDF/image/.docx, iOS Share Extension
• Graph view of your wiki’s structure + orphan-page / missing-link lint

Best for

• Research professionals (auditing, finance, legal) who need traceable knowledge
• Lifelong learners building a personal canon
• Anyone tired of RAG and ready to let an AI maintain a living wiki

Folium does not

• Show ads
• Track you
• Send your content anywhere except the LLM you chose
• Store anything on a server we don’t have

Status

Preparing 1.0 launch — pending Apple Developer Program enrollment + ICP filing.