For personal knowledge management

Build your second brain

Capture everything, connect ideas with backlinks, and actually find them again — a knowledge base for your whole life.

Start free

A second brain that grows with you. Capture notes, links, and ideas; connect them with backlinks; and rely on search and AI to resurface exactly what you need, whenever you need it.

Sound familiar?
  • Knowledge scattered across apps, bookmarks, and your memory.
  • Forgetting things you learned a month ago.
  • No system that survives more than a few weeks.

How it works

Connect everything

Backlinks and mentions weave notes into a personal knowledge graph.

Instant recall

Full-text search resurfaces any note, idea, or link in seconds.

Ask your second brain

AI answers questions grounded in everything you’ve captured.

Remember what matters

Turn key notes into spaced-repetition flashcards.

Daily capture

A journal makes capturing fleeting thoughts effortless.

Structured collections

Track books, ideas, places, and projects as filterable databases.

Content types that shine:DocsDatabasesFlashcardsJournalWhiteboards
FAQ

For personal knowledge management — questions

It’s a trusted external system where you capture and connect everything you learn, so you can offload memory and resurface ideas on demand. Arythmatic Notes is built for exactly that.

More ways to use Arythmatic Notes

For students
Study smarter, remember more
Organized course notes, AI flashcards, and spaced-repetition revision.
For researchers
A connected home for your research
Linked sources, structured libraries, and AI synthesis for research.
For writers & creators
From blank page to finished piece
Outlines, drafts, and AI writing help in one focused workspace.

Put Arythmatic Notes to work

Free to start, no credit card required. Bring your team when you're ready.

Start free — no card needed

Free forever for individuals · No credit card required