For iPhone · in progress

fak10 The diary of your time.

Never want to fill in a form again? fak10 keeps what makes up your life and helps you act on it. Let the computer handle the tedious bits.

A form filled in within 2 minutes


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A diary that does something

A diary records. An AI chat forgets, or remembers on someone else's servers. fak10 stays on your device and puts what it knows to work.

Keep

Everything in one place

People, contracts, documents and what matters to you. Every entry with its source and date.

Remind

What never made it into the calendar

The policy that runs out in four weeks. The notice period, before it lapses.

Act

Forms, filled in

From what fak10 already knows about you. You check, you sign. “Computer, do it.”

Three promises

While everything moves to the cloud, fak10 stays with you.

01

Anna on your device

Anna understands language through her own grammar, right on your iPhone, even offline. She doesn't guess: if she doesn't understand something, she asks.

02

The AI only when you call it

For a long document you can bring in a big AI. Beforehand you see exactly what leaves your phone, and nothing else does.

03

No account

No sign-up, no server stores your data. What you tell fak10 belongs to you.

Your data never leaves fak10 unencrypted.

Anna is thirty

At sixteen, I built a tree of my own needs in Excel, with her name hidden in the file name: An@lyse. She has been called Anna ever since. Today I'm using the big AI to build the small one I always wanted.

Read the whole story →
  1. 1996 · aged 16: the first Excel sheet, Anna gets her name
  2. 1999 · An@lyse.xls, the oldest surviving version: needs as a tree, each with a value and a priority
  3. Summer 2009 · “Annalyse” in Java: Anna learns grammar
  4. 2010 · diploma thesis on similarity: when are two entries the same thing?
  5. 2017 · your-life: Anna as a module of a web app
  6. 2021 · fak10
  7. today · Anna learns language, rule by rule, in German and English

Anna versus the big AI

Three short texts about a made-up family, fourteen things you should know after reading them. Anna reads them on the iPhone, a big AI in the cloud. I measure in the open and publish every result.

Anna

on the iPhone, offline

2 of 14 understood
  • 0 false entries
  • What she doesn't understand, she asks about instead of guessing.

Big AI

language model in the cloud

12 of 14 understood
  • 4 invented relations, such as “is not the daughter of”
  • 1 contradiction: lives in Leipzig and used to live there
  • 1 person created twice

The big AI understands far more today. Anna, in return, writes down nothing false. To be fair: some of the AI's mistakes come from my protocol, which can't express negation yet. I'm improving both sides and will publish every new result.

Big AI: Claude Opus 5 (Anthropic), the same one fak10 will later use to read documents. Measured on 26 September 2026 · Follow the series in the devlog

Opening soon

Be there when fak10 launches

The waitlist opens soon. I'll only collect addresses once they are stored with a provider in the EU and the privacy policy is in place. Until then, follow the devlog to see how Anna learns language.

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