What a note is for
Not storage. A note exists to be met again — years later, mid-thought, by someone who forgot writing it.
SECOND BRAIN SYSTEMEvery thought deserves a card.
Every thought deserves a card.
Every card deserves a sibling.
Substrate keeps notes the way libraries kept minds before software: on index cards, cross-referenced by hand, waiting in the box to surprise you.
free while in beta · your notes stay yours
Atomic thoughts
One idea per card. Small enough to combine, precise enough to find again.
Why links beat folders
A folder asks “where does this go?” A link asks “what is this like?” Only one of those questions makes you smarter.
The serendipity engine
Open any card and Substrate quietly deals three related ones from your past self onto the table.
The daily log
Today’s card is always on top. Yesterday’s is already linking itself to things you won’t write until next year.
click a tab, or a card’s red cross-reference
THE METHOD
Three moves, repeated for life.
Write it on a card
One thought, one card, ten seconds. If it takes longer, the thought wasn’t ready.
Tie it to its siblings
Substrate suggests the relatives. One click and the red string is tied — both ways, forever.
Let the box deal them back
Old cards return when they’re relevant again. You forget; the box doesn’t.
INSIDE THE BOX
Old habits, new hardware.
Backlinks both ways
Every link draws a return line. Open any card and see everything that ever pointed at it.
STANDARDRecall that forgives typos
Search “berer” and find Béres. Full-text, fuzzy, instant — across a decade of cards.
STANDARDLocal-first files
Plain markdown on your disk first, sync second. The box lives in your house.
STANDARDLeave anytime
Export the whole drawer as markdown with one command. No lock-in, no ransom.
GUARANTEED| ISSUED | RETURNED | BORROWER |
|---|---|---|
| mar 3 | mar 9 | R. Alvarez |
| jun 14 | — | you, eventually |
“I reread my own notes like letters from a smarter friend.”
Your future self is taking notes.
START THE BOX — FREEno credit card · export everything, always