Notes
Information worth keeping, in a tidy note.
You say
Restaurants in Tokyo I want to try: Narisawa, Den, Sushi Saito.
It keeps
NoteRestaurants in TokyoCognitive OS · Free · nothing to set up
An AI companion that remembers and organizes everything.
Talk to Cognitive OS the way you talk to ChatGPT or any other AI, about anything. We remember everything that matters and forget nothing. Cognitive OS is like an external hard drive for your brain. Everything you usually keep in your head, you can hand over. It remembers all of it and puts it in its place.Talk to it like ChatGPT, about anything. Cognitive OS remembers what matters and puts it in its place.
Free. Nothing to set up.
Theme — pick yours: the page and the app switch
Live
Next month I want to go to Tokyo, for five to seven days I think. I like good boutique hotels and direct flights. And I want to try Narisawa and Sushi Saito. Where should I start planning?
Cognitive OS
Start with the flights: direct ones to Tokyo for next month go early, and the hotel is easier to pick once you know where you'll be eating. When we get to booking, I'll start from boutique hotels and direct flights. And I've kept Narisawa and Sushi Saito, so you won't have to remember where you mentioned them.
How it works
You wrote one messageLive
Next month I want to go to Tokyo, for five to seven days I think. I like good boutique hotels and direct flights. And I want to try Narisawa and Sushi Saito. Where should I start planning?
Write your own message — the demo answers and keeps it. Or just scroll: it carries on by itselfWrite — the demo answers. Or keep scrolling
Just talk. You don't have to save anything.
Cognitive OS knows the difference between talking and something worth keeping. An ordinary conversation stays a conversation. Useful information becomes something you can find and use again.
- I've decided to launch my startup in October.Decision kept
- I prefer window seats.Fact about you kept
- Three restaurants I want to try in Tokyo: Narisawa, Den, Sushi Saito.Kept in a note
- Let's talk through moving to Barcelona.A topic begins
- What's the capital of Peru?Just a conversation. Nothing to save.
You just chat. We put everything in its place.
No folders, notes, lists or tables to create. Cognitive OS works out what you actually said, what is worth keeping, and in what shape.
You don't have to remember what you said, or when.
Just ask. Cognitive OS finds it in your earlier conversations and shows where it came from.
Live
You wanted to try Narisawa, Den and Sushi Saito. I kept them in the note Restaurants in Tokyo.
Open the note →
We decided to try €19 a month. You discussed it on 12 August.
Open the original message →
Click a question or ask your own — the answer comes from these same conversationsAsk your own — the answer comes from these conversations
Pick up where you left off.
Yesterday
I'm thinking about opening a company in Japan.Months later
What was I thinking about Japan?You were considering opening a company in Japan. We went through three options: …
Let's change the plan now.Sure. Tell me what changes and I'll update what I have.
Fact updatedConsidering a company in Japan
Cognitive OS doesn't just remember the past. It lets you continue from where you stopped.
How Cognitive OS compares.
Each of these apps is good at something, and each card says what. Cognitive OS is the one where you just talk, and what you say becomes notes that file, connect and update themselves.
Each app as it comes, without plugins, going by its own public description in October 2026.
Each app as it comes, without plugins, going by its own public description in October 2026.
1 / 3
The AI creates notes by itself.
Cognitive OS gathers what matters into tidy notes. You never open an editor, invent a title or decide where it goes.
Restaurants in Tokyo I want to try: Narisawa, Den and Sushi Saito.
Kept. I put them in a note, so they'll be there when you plan the trip.
New noteRestaurants in Tokyo
Live
Restaurants in Tokyo
Travel / Tokyo
The note is real: click a row, tick ✓, drag — it respondsTap, tick ✓ — the note is real
Facts about you
The AI remembers who you are.
Preferences, goals, decisions and other things about you are kept separately, so Cognitive OS can use them later, when they actually matter.
I prefer direct flights and small boutique hotels.
Got it. I'll keep that in mind whenever we plan a trip.
Remembered · PreferenceYou prefer direct flights and boutique hotelsYou never have to repeat yourself.
Live
Later
Find me a hotel in Rome.
I'll start with small boutique hotels, since that's what you prefer. A few in the centre worth a look: …
Facts about youIn one list
You prefer direct flights and boutique hotelsPreferencefrom your message · today
Click «Correct» — the fact changes, and the «Later» reply changes with itTap «Correct» below — the reply changes
Topics appear by themselves.
When you keep discussing one thing, Cognitive OS packs those messages into one big topic and keeps it. You can come back to any topic later.
Live
TopicsWhat we have been talking about.
- Trip to Tokyo6 messages · last discussed today
Five to seven days next month, boutique hotels and direct flights, Narisawa and Sushi Saito to try.
- Moving to Barcelona14 messages · last discussed yesterday
Neighbourhoods, rent, taxes, and whether it's this spring or next year.
- Pricing for Cognitive OS9 messages · last discussed 3 days ago
€19 a month first; a free month only if people come back after it.
Click «Continue conversation →» — the chat opens with that topicTap «Continue conversation →» — the chat opens
A topic is simply: here's what we've been talking about for a while.
Every topic can branch into its own conversation.
Every subject gets its own thread. We keep the main chat from turning into a mess of unrelated topics.
Live
Back to chatPricing
You wrote: Let's think about pricing for Cognitive OS.
€19 a month, or €29 with a free month?
€19 is easier to say yes to, and a free month only helps if people come back after it. I'd test €19 first.
Remembered · DecisionTest €19 a month
Reply in the thread — it is a real thread, it answersReply in the thread — it is real
Everything is connected.
People, places, companies, projects and information are linked to each other. Cognitive OS understands those links and can use them when you ask a question.
- Anna
- works at
- Acme
- may introduce you to
- an investor
Live
Drag a dot, click «Anna» — the graph is live, as in the appDrag a dot — the graph is live
The Graph page shows how what you know fits together.
Soon
Tasks. Not just remembering. Helping you get them done.
Tell it what needs doing and Cognitive OS will keep the task. When it matters, it will remind you at the right moment.
You say
I need to call Anna tomorrow.
It keeps
Task createdYou say
Remind me to check the documents on Friday.
It keeps
Reminder createdNot available yet. Today it keeps what you said, but it will not remind you.
Bring in information however you like.
Type it. Say it out loud. Send a photo, a file or a link. Cognitive OS will learn to handle all of it the way it handles a normal conversation.
- TextWorks
- VoiceWorks
- ImagesSoon
- FilesSoon
- LinksSoon
- Video linksSoon
- YouTube, Instagram and Telegram postsSoon
Text and voice messages work today. Images, files and links — including YouTube, Instagram and Telegram — are next.
Three steps
Talk the way you would to ChatGPT — discuss anything. The AI works out what is worth keeping as a note, a fact, a topic or a connection, and keeps it.
- 1
Talk
Discuss anything, like you would with ChatGPT: plans, people, decisions, ideas — everything you usually keep in your head.
- 2
Cognitive OS does the rest
It works out what is worth keeping and turns it into notes, facts, topics and connections by itself.
- 3
Come back any time
A day, a month or a year later, just ask — and continue from where you stopped.
You don't have to be an organized person at all.
No notes to create. No titles to invent. No sorting. No remembering where you wrote it down. Just talk.
You
talk
Cognitive OS
- understands
- keeps
- organizes
- connects
- updates
You
ask, and use it
This is what happens after a normal conversation.
You just talk. On the right, Cognitive OS has already gathered what you'll need later.
Live
Next month I want to go to Tokyo, for five to seven days I think. I like good boutique hotels and direct flights. And I want to try Narisawa and Sushi Saito. Where should I start planning?
Cognitive OS
Start with the flights: direct ones to Tokyo for next month go early, and the hotel is easier to pick once you know where you'll be eating. When we get to booking, I'll start from boutique hotels and direct flights. And I've kept Narisawa and Sushi Saito, so you won't have to remember where you mentioned them.
Which restaurants in Tokyo did I want to try?
Cognitive OS
Narisawa, Den and Sushi Saito. They're in your note Restaurants in Tokyo.
The same chat as in the app: write something — it answers and shows what it keptWrite — it is the same chat as in the app
How many useful thoughts have you already lost?
None of it has to stay in your head.
Just hand it to Cognitive OS.
Cognitive OS on every device.
One account, every screen. Start on your laptop, pick up on your phone — everything you kept is already there.
Desktop
Mac and Windows
Cognitive OS in a window of its own, one click away.
Mobile
iPhone and Android
Keep a thought the moment you have it — typed or spoken.
Web
Any browser, on a computer or a phone
Nothing to install. The web version works today — on desktop and on mobile.
The iPhone app is in beta on TestFlight; the Windows and Android apps are on the way. Until then, everything works in the browser, on a computer and on a phone.
Questions
An AI you can talk to about anything. Unlike an ordinary chat, it keeps the useful information from your conversations and organizes it by itself.
Stop keeping everything in your head.
Just start talking. Cognitive OS works out what to keep and how to organize it.
Start with one conversation. Nothing to set up.