Getting started
Learn by doing
Instead of reading, try each once on the real screen — one thought, writing help, the right panel, the map, asking. Steps check themselves off.
Three brains · your words stay yours
From your notes,your next piece
Not a notebook — a brain that thinks as you write. Write one line and it reads that note; as notes build up, it links them to your other notes and maps your whole mind.
You wrote the perfect line for this piece — three weeks ago, somewhere.
For people who write from their notes — reading notes, blogs, essays, newsletters, research.
Free beta for now — we don’t take payments yet. Already have an account? Log in
- Your notes never train AI
- Export anytime
- Delete your account anytime
AI features send your notes to OpenAI for processing. You can hide any note or folder from AI, or turn AI off entirely in Settings. How it’s processed
Speed vs. finish
Writing…
Example
Three brains
One note, three brains
One, two, three dots in the same head — each brain sees a wider view: the note you’re writing, your other notes, your whole mind.
From your first note
It reads the note you’re writing
- Before
- Notes pile up exactly as you wrote them.
- In Byeori
- As you write, the gist and the hidden premise appear beside the note.
It looks at this one note. Ask, and it refines, continues, or pushes back. Unasked, it jots the hidden premise the note leans on from the first line or two — and, once the note grows, what it is really saying.
- Writing help — refine · continue · push back (only when asked)
- Gist — what this note is really saying
- Hidden premise — what this note takes for granted
This note
- Gist
Picks speed over polish
- Hidden premise
Are you assuming you’ll get a chance to fix it?
- Writing help
Push back — what can’t be fixed later?
Moving your notes in — bring Notion, Obsidian (your [[links]] kept), Apple Notes, Evernote or Markdown. From import day, open any note and the ones that echo or contradict it show up beside it. Your notes aren’t used to train AI, and you can export anytime.
See importLiving map
Your thinking becomes a map
Similar notes gather into regions, and each region gets a name. Come back and what’s new since last time shows up first.
How I workInvestingTravel logBooksResearch & study
+3 since last timeExample mapRegions & names
Your brain groups and names them. Rename one or turn it into a folder.
New since last time
New notes and growing regions, pointed out first.
Timelapse
Watch the map redraw in the order your thinking grew.
Ask this region
Narrow a question to one region’s notes.
Lonely notes
Find notes that touch nothing and connect them.
Themes
Classic · 3D · hologram · constellation — the same brain, seen differently.
Ask My BrainSample brain
A sample brain — 130 notes a made-up person wrote. Ask as if they were yours. Forgot the title? Ask in other words.
Which city was it where my shoes got soaked in the rain?
It was Paris, from Paris in the rain.
Source notes
Paris in the rain
Ask
Ask, and it answers from your notes
Not a generic chatbot. It searches what you wrote, answers from it, and shows the notes it relied on. Keep asking, and save good answers as notes.
- The notes behind each answer come along
- Ask follow-ups
- Save answers as notes · review cards
Easy start
Never stuck at a blank page
You don’t need to write a lot on day one. Learn by doing, and bring the notes you already have.
Import
Bring your notes as they are
Notion · Obsidian · Apple Notes · Markdown · Bear · Evernote · PDF · Word. Your brain grows from what you bring.
Journal
One line a day
A line in today’s journal. As it piles up, your brain gets a clearer read on what’s been on your mind lately.
Timeline
What you get today, and what comes later
Your brain gives back what you put in. So we say when each thing opens up — and only promise on day one what’s true on day one.
Today
One line to start
Write whatever comes to mind. Your brain jots the hidden premise it leans on and a question to keep writing — and, once the note grows, its gist. Unless you ask, your sentences stay as they are.
As notes pile up
Your notes start to link
Similar and follow-on notes appear as pairs, and your first region shows up on the map. Pair two notes to draw out a new thought.
After a few weeks
Your brain speaks first
Places where you once argued the opposite, topics that keep returning, gaps — things you only see once notes build up. The longer you write, the more you get.
Everywhere
Think on the web, capture on your phone
The web is home base — start in your browser, nothing to install. The iPhone and Android apps are out too: same account, same brain.
Now
Web
Right in your browser — notes, the three brains, the map, ask, import.
App Store
iOS
Capture in the moment, capture by voice, ask. The same brain grows.
Download on the App StoreGoogle Play
Android
The same app on Android. Same account, same brain.
Get it on Google PlayPosition
Between storing and pasting
Notes usually get stored in a notes app, or pasted into a chatbot when needed. Byeori sits in between — it reads all your notes, sets things out beside the note you’re on, and leaves your original words alone.
How notes are seen
TodayReads everything you’ve written — and the note you’re on, while you write
Links between notes
As notes pile upOpen a note and the ones that echo or contradict it show up beside it
Shows things first
TodayWithout being asked, sets out the hidden premise and a question to continue beside your note — and the gist once it gets long
Map of your thinking
As notes pile upGroups similar notes into regions and names them
Grounds for answers
TodayAnswers from your notes and shows the notes it used. If it isn’t in your notes, it says so
Your words
AlwaysOriginals stay as written. Refining happens only when you ask, on the part you pick
Wake up your second brain
One line today,
and your brain starts growing.
Three brains that read the note you’re writing, link it to your other notes, and map your whole mind. The more you write, the more it gives back.
Free beta for now — we don’t take payments yet.
Byeori (벼리) — Korean for the rope that threads every knot of a net — and a verb, to sharpen a blade. It links your notes and sharpens your thinking.