I
Save time
Capture in a second, find it with a question. No time lost filing, searching, starting over.
A second brain · for iOS
Anchor every thought. Keep the flow.
One dock, always there: speak or type — no folders, no friction. The agent composes the page you need and links your ideas. You save time — and your mind stays light.
Local-firstOn-device AINo ads, ever
The demo
01 / 05
The menu
Your starting point: suggestions drawn from your memory, and the capture bar always there.
Tap the capture bar
9:41
✦ 2ndBrain
Bonjour, Noa.Que veux-tu construire maintenant ?
il te propose
réorganiser ma semaineplanification
épargner pour Tokyoobjectif
une semaine de plusréflexion
The point
Less friction, more presence.
Between an idea and its trace, there should be nothing.
II
Stay fluid
No friction between your thoughts: they anchor on the fly and stay connected. The thread never breaks.
III
Lighten your mind
Nothing to hold, nothing to lose. Your memory is kept for you — the mind stays calm and present.
Four pillars
One app, four ways of thinking.
Capture
01Get it out of your head.
One always-present dock. Speak or type — suggestions are drawn from your memory.
Compose
02It composes the screen.
The agent reads your intent and assembles the interface from ~30 recombinable blocks.
Goals & reflectionsoon
03Plan, save, reflect.
A single surface composes a week, a savings goal by milestones, or a guided review.
Memory
04Nothing is lost.
Every capture becomes a node. Your memory weaves itself into a living graph.
Connection
A memory that connects itself.
Every note you keep becomes a node. Related thoughts drift toward each other and form constellations — and the agent traces the insight links you'd never spot yourself.
projectnotereadinginsight link
Grounded in research
The science behind the gesture.
The gesture isn't an aesthetic choice. Four established findings in cognitive science underpin it.
Offloading memory to an external tool frees mental resources for thinking.
Read the study →External tools aren't mere aids — they become a genuine part of cognition.
Read the study →Just writing down an unfinished task frees the mind from intrusive thoughts.
Read the study →Saving information improves the learning of what comes next.
Read the study →Questions
What people ask us.
The essentials on 2ndBrain, privacy, and the iOS beta.
What is 2ndBrain?
2ndBrain is an AI note-taking app for iPhone. You capture any thought in one tap, and on-device AI organizes it and composes the exact view you need — no folders, templates, or setup.
How is 2ndBrain different from Notion or Apple Notes?
Notion and Apple Notes make you build the structure — folders, templates, tags. 2ndBrain inverts that: the agent reads your intent and composes the interface for you. Less managing, more thinking.
Is my data private?
Yes. 2ndBrain is built local-first, with AI that runs on your iPhone. Your memory stays on your device — never sold, never monetized through ads.
Is 2ndBrain available on Android or the web?
Not yet. We're launching on iPhone first to make the experience excellent on one platform. Join the waitlist to hear when other platforms arrive.
How much will it cost?
Pricing isn't final. Waitlist members get the earliest access and any launch offers first.
When does it launch?
The iOS app is in active development. Join the waitlist and you'll get one email the day it's live.
What can I capture?
Text, voice notes, links, and images — anything you'd want your second brain to remember.
✦
Begin a living memory.
Join the waitlist for the iOS beta. We're opening seats slowly, in the order they're asked for.
Free during the beta · iOS · No spam, no noise