Tekkoh

手帳 · A journal for iPhone

One page
for each day.

Write a few lines. Tekkoh keeps the rest of the day beside them: where you went, how far you walked, the sky at sunrise, the photos you took. And it keeps all of it to itself, encrypted with a key only you hold.

Coming to the App Store How it stays private →

Tekkoh open flat on iPhone Duo: the date, a map of a walk through Kyoto and the day's photos on the left page, the day's writing on grid paper on the right.

The margin

The day writes its own margin.

Like a techō, each page has room to write and a margin full of small, printed facts. Tekkoh fills the margin for you, quietly, as the day goes on.

  • Places The places you stopped, on a small map, with the time you arrived.
  • Movement Steps, distance, floors and walks, from Apple Health.
  • Sky Sunrise and sunset where you were.
  • Photos The pictures you took that day, suggested in a tap. Add a caption, or take one off the page with a tap.
The margin of a day's page: the date in large serif numerals, the weekday in kanji, the streak stamp, a map of the walk, three places in Kyoto with their times, sunrise and sunset, steps, and two photos.

iPhone Duo

Open it flat, like a notebook.

On iPhone Duo the journal opens as a two-page spread: the margin on the left, your writing on the right, the fold running down the spine. Stand it up halfway and you write on the raised page while the day lies flat below.

When you only want the words, put the margin away. The page becomes a single sheet of grid paper and a line of text, with nothing else on it.

Focus mode on iPhone Duo: only grid paper and the writing in a centred column, the date small at the top.

The streak

A little every day.

Each day you write, the streak grows, stamped in vermillion at the top of the page. At half past nine, if today is still blank, Tekkoh reminds you, once and gently, how many days you'd be keeping.

The month index: the streak stamp, pages written, and November with the days written joined by a vermillion line.
The month, like a techō's calendar pages.
The year at a glance: small months with every written day marked in vermillion.
Pinch to see the whole year.

今日 · Widgets

Today, at a glance.

The date as a notebook prints it, and the streak inside an ensō, on your Home Screen, your Lock Screen and in StandBy by the bed. The circle stays pale until today's page is written.

Small widget: Sunday the 8th of November, a 23-day streak in an ensō. Medium widget: the date on the left, the streak in an ensō on the right with the last seven days as beads.

Privacy

Yours alone.

A journal is the most private thing you write. Tekkoh is built so that no one else can read it, including us.

  1. Encrypted on your phone

    Every page and every photo is encrypted on your iPhone before it goes anywhere, each with its own key. Places, captions and steps too.

  2. A key only you hold

    Your journal's key lives in your iPhone's Keychain and iCloud Keychain. Our server never has it in a form it can use, so it stores only pages it can't open.

  3. A PIN to bring it back

    Lose your phone and a six-digit PIN restores the journal on a new one. Ten wrong tries, slower and slower, and the server destroys its copy of the recovery.

  4. Open about the limits

    No system is perfect, and a six-digit PIN has limits. We've written down plainly what Tekkoh protects against, and where that protection stops.

    Read the security notes →

Offline first

Write on the plane.

The whole journal lives on your phone, so you can read last spring or write today with no signal at all. When the network comes back, it syncs. If two devices wrote the same day, both are kept, one after the other, rather than one quietly replacing the other.

You can link a browser too. Scan a code from your phone and the same journal opens on a computer, encrypted in exactly the same way.

Begin today.

Tekkoh for iPhone is coming to the App Store.