A private notebook · in beta
A notebook that thinks back.
You write in Ka the way you would in a notebook: scraps, plans, the same worry three times in a week.
A few minutes later, if something in what you wrote seems to matter, it answers in a sentence or two. If nothing does, it stays quiet.
Tuesday, 21:40
Said I'd send the chapter to Maren by Friday. Spent the evening putting the books in order by colour instead. The shelf looks wonderful.
four minutes later
This is the third time this month you've written about tidying in a week a chapter was due.
that is itthat is not mesay more
What it does, and what it won't
It isn't a chat.
Chat apps reply to every message and keep the conversation going. Ka answers an entry once, in a sentence or two, or not at all. It uses AI to read what you write and find what in it seems to matter; then rules we wrote, not the AI, decide whether it speaks. So when it does, something in your writing called for it.
If it stays quiet and you want to hear from it, you can ask once, with the small Ka? under your entry.
You can tell it it's wrong.
Under each reply are three buttons: “that is it”, “that is not me” and “say more”. They're there if you want them; you never have to press one. Press “that is not me” and Ka corrects what it said, may disagree once, then leaves it with you.
The reply isn't erased: it's kept to one side, where you can reread it or delete it.
It forgets, and says so.
Like a person's memory, Ka's memory of you fades unless you keep coming back to something. That keeps it about who you are now, not who you were last March. What it keeps shrinks over time: a note, then a phrase, then a word, then only that something mattered, and when.
Your writing itself is never touched: everything you wrote stays, word for word. Ask about something Ka has let go, and it says so: “I don't remember anymore, except…”, with your own words from then underneath.
One note, fading - a noteYou keep coming back to leaving the lab, on Sundays mostly, and each time you call it only an idea, then plan the move in detail.
- after 30 days quiet: a phraseleaving the lab
- after 60: a wordleaving
- after 90: only that it mattered, and whenSomething mattered here. March.
It may find a word for you.
When you keep circling something for weeks and ordinary words don't fit it, Ka may offer a short name for it, built from your own phrases: “the long field”, say, for the land you keep writing about. Take it up and it stays; leave it, and it goes.
It won't pick a side for you.
When you want two things that pull against each other, like selling the land and keeping it, Ka never tells you which is right. Rarely, after weeks, it may write a few paragraphs that take both seriously.
Also
Now and then, an idea from somewhere else.
On something you keep returning to, Ka may bring you, at most once a month, a passage, an idea or a painting from another field or another century, with a link to where it comes from. It searches with a few general words, never your own, and shows you what they were.
Errands go to Plain.
Questions, facts and reminders go to Plain, a separate helper with a plain voice. Type /ask or /remind in the writing box, or use its own page. Nothing you ask Plain reaches Ka, so asking about the weather never becomes part of how Ka sees you.
Bring your writing in.
Old journals and notes, from Day One, Word, Markdown or plain text files, and your highlights from a Kindle or Readwise, come in with their own dates. Ka reads them first, so it can know you sooner.
Who it's for
People who think in writing: essayists, researchers, students in the middle of a long piece of work, anyone who keeps a notebook and has noticed they keep circling the same few things.
Ka uses AI, but it is not an assistant and not a therapist. It is closer to the inner voice you think with: a second voice, grown from your own writing (in ancient Egypt, a person's double was called their ka), and it gets better at being one over months, not minutes.
It works in your browser and on your phone's home screen, in English, Spanish, French, German, Russian and Bulgarian.
Your words are yours
Kept as you wrote them
Everything you write is kept exactly as you wrote it, until you delete it. You can download all of it at any time.
Encrypted, with one honest limit
Your words and Ka's notes are encrypted with Ka's own key before they reach the database, so the company that runs the database cannot read them. The key is on our server, because Ka has to read your words to think about them. That means we, who make Ka, could read them too. We don't, unless you ask us to look into a problem or the law requires it. When we do, it is written on your memory page and emailed to you, at once or, if a law forbids telling you, once it allows. This is not end-to-end encryption, and we would rather tell you than let you assume it.
Nothing sold, nothing trained on
We sell nothing about you and show no ads. To think about your writing, Ka sends parts of it to an AI model made by OpenAI, only by a route we have checked; the page on how Ka keeps your words names every company it may pass through. Every request asks that nothing is kept and nothing is used for training.
Delete anything, any time
Every note Ka keeps can be read and deleted on its memory page. Delete an entry and everything Ka drew from it goes too. Delete your account and all of it goes at once. Backups age out within 30 days.
Who makes Ka
Ka is made by InterfaceDelta, Inc., a very small company: one person, Arto, who builds it with the help of AI tools. I wanted a notebook that thinks back, the way your own inner voice does when you write.
Join the beta
Ka is free while it is in beta. If it ever costs money, we'll tell you well before, and you can always download everything you wrote. Sign up with your email, and we'll send a link and a code.
99 places left in this beta.
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