A OneNote-style space that keeps your thinking organized — notebooks, sections and pages — and surfaces every open to-do across all of them. Links between notes, fast search, autosaved as you type.
Quick to capture, easy to structure, impossible to lose.
A clear three-level hierarchy so everything has a home.
Headings, lists, checkboxes and formatting — the same smart input rules as Documents.
Tick off tasks inline, and see every open to-do across all notebooks in one place.
Link notes together with [[double brackets]] and jump between ideas.
Find any word across every notebook in an instant.
Never lose a thought — notes save locally the moment you write.
Drag to reorder, pin the important pages, keep priorities on top.
Your notes live on your device and work with no connection.
Jot a plan, link related notes, and roll every open to-do into one view. When an idea is ready to become a document or a deck, the rest of IO Lumen Doc is one click away.
Notebooks → sections → pages, with [[wiki-links]] connecting related notes.
Yes — a roundup surfaces every open task from all your notebooks in one place.
Yes — fast full-text search across everything you’ve written.
Yes — it autosaves locally as you type.
Free to download, free to use. AI when you want it.