Prubi App | One line today helps tomorrow's you

Jot it at a café. Pick it up at your desk. Not to keep yesterday, but to get ready for tomorrow. A line a day, in another language — write one line about your day and see it as natural Korean phrases Want a locked diary? Write it in the vault, or move a note there — it is encrypted on your device.

Prubi home — a desk dressed with stationery and the input that starts with one line

How one line grows

Scattered thoughts gather in one place, and what gathers becomes tomorrow's wisdom.

Scattered

You wrote plenty — split across apps, never to be found again.

Gathered

In one place, your lines start connecting to each other.

Growing

What you kept reflects who you were, and today's choice gets a little clearer.

Planted again

Share the good lines, and plant them again for tomorrow.

One line is enough.

Thoughts slip away fast. You don't have to write much — what you jot down stays.

Small starts are the ones that last. 7 Days of Gratitude — one line a day, and skipping a day is fine.

7 Days of Gratitude on Home and a one-line journal, with the hedgehog and hamster friends

Your desk grows as you write.

Paper & Light, Golden Spring One of One, Watercolour Dawn, Pixel Dot — pick the feel of your desk with a theme.

Then tape, a ribbon, a date stamp, and a small friend walking the bottom of your screen. Nothing to buy — they open up one by one as your days of writing add up.

Themes · Paper & Light · Golden Spring One of One · Watercolour Dawn · Pixel Dot

Friends · Scottish Fold · Bichon · Tabby Cat

And a cream poodle in three cuts — classic · teddy · schnauzer

The stationery drawer — tape, stamps and the friends row

A decorated desk and the stationery drawer — the parrot and sixteen pixel friends that unlock as you write

Three hundred years ago, it was one line a day.

Franklin opened each morning with a question — “What good shall I do this day?” — and closed each evening with another: “What good have I done to-day?”

Nothing grand. Ask, write it down, look again tomorrow. That was all of it.

Da Vinci · noting what he saw, on the spot

Marcus Aurelius · writing to himself

Woolf · keeping each day's impressions

Kahlo · words and pictures on one page

Decision journal — the choice, why, what you expected, what happened

Decision journal — the choice, why, what you expected, what happened — with the hedgehog and hamster

Start on your phone. Continue on tablet and PC.

The line you wrote on the train to work is there when you sit down. Same account, same notes — on the web, iPhone, iPad and Android.

Writing a note on the phone

What you keep, you can find again.

Your entries gather in the Archive by date and category. Search when you need them.

Archive journal list with search

Archive — journals gathered by date, with the hedgehog and hamster

Open it like a memo. Write it like a doc.

On days your thoughts run deeper, shape them with a heading and a checklist.

Note editor with a heading and checklist

Note editor with a heading and checklist, with the hedgehog and hamster

Your notes, next to what's coming.

Notes and events share one calendar. Look back, then plan the next thing.

Month calendar with events

Weekly planner and the 24-hour day view, with the hedgehog and hamster

Even we can't open it.

Lock away notes, diaries, budgets and meeting minutes in your Personal Vault. Passwords go in a Secure note — hidden at first, and not shown in the list. It's all locked on your device before it leaves, so our servers only hold ciphertext.

That also means if you forget your vault password, Prubi can't recover it.

Locked vault with the no-recovery notice

Locked vault — its own password, opens on this device only

See which of your notes were sent to the AI.

Ask about your own notes, then open the panel under the answer to see exactly what was shared.

"Find my notes about Mom" — the answer shows the notes it found, exactly as written

One card. One form link.

Today's line becomes a picture card. Send just the card, no link — anyone can read it, even without the app.

Plans, polls and sign-ups go out as one Prubi Forms link. People answer without the app, and the answers come back to your form.

Four wind cards on cream, navy, mint and lavender paper

A Prubi Forms card — "What would you like to ask?"

Jot it down, it becomes a plan.

Write one line like "Dinner with Jisu tomorrow at 7pm", tap "Let Prubi sort this", and the date and time land on your calendar.

You choose what goes in before anything is saved — only what you pick is stored.

"Prubi sorted this" — a sheet splitting one line into an event, a task and a note

"Prubi sorted this" — one line split into an event, a task and a note, landing on the calendar

How to say it in Korean — your own line, in natural Korean with native pronunciation

the sentence, how it sounds, and what each part means.

Listen, read along, then hide it and write it in Korean yourself

A line a day, in another language — two app screens showing today's line as natural Korean with sound, meaning and key phrases

You wrote so much down. It's never there when you need it.

You didn't forget. Your notes just got scattered.

Office worker · commute — That one thing from the meeting fades by the time you're home. One line on the train, saved with the day it happened.

Planner · café — Ideas in a notebook, dates in a calendar, decisions in a chat. The pieces finally land in one place.

Nurse · after a shift — The whole day hits you the moment the shift ends. Jot it down, then actually rest.

Designer · studio — Miss the moment, and the idea never comes back. One line, right where it came to you.

Grad student · library — You can't remember why you decided that. Keep your reasons, and next time you'll have an answer.

Freelancer · evening — No time left at the end of the day to look back. A line a day adds up — and you start to see yourself.

Before you start

What should I write first?

Just one line. Start by saving one thought from today as a Quick Note.

Can I use it on my phone and my PC?

Yes. Sign in with the same account on the web (prubi.online) or the iPhone and Android apps to pick up the same notes.

What if I forget my vault password?

Prubi can't open it for you. The vault is locked on your device: your password derives a key (PBKDF2, 210,000 rounds), that key encrypts the contents (AES-256-GCM), and only the ciphertext goes to the server. Neither the password nor the key is stored on the server, in logs, or on the device — so being signed in doesn't unlock the vault, and no one at Prubi can. Your only backup is a recovery key you issue from inside the vault. It's shown exactly once and never stored, so issue it early and keep it somewhere safe, apart from the password.

A day becomes one line, and that line opens the next.

You don't have to count features. Just follow one day.

One line, while it's there.

Leave it before you forget. It doesn't have to be long, and you can fix it later.

Home — the box where you leave one line

The lines become a day.

Scattered notes gather by date. Your day is sorted without writing it twice.

Archive — today's notes stacked

Same question again? The answer is here.

It shows which of your notes it read to answer. The answer comes from your own record.

Ai.think — an answer grounded in your notes

Prubi, as you'll see it in the App Store

A private diary that greets you back — A little friend says hi every time you open it

Write daily, get a journal book — Pick a date for that day's entry · one month, one book

Notes and photos, all in one place — Every photo from your notes, gathered on one shelf

Lock it. Encrypted on your device. — Passwords stay hidden, even in the list

A private budget, added up for you — Money in · money out · what's left, automatically

Confidential meeting notes — Attendees · agenda · decisions · to-dos

Start with one line today.

Free to start · write on your phone, continue on PC