A diary with a rule.

Today is editable. The past is not.
Continue with Google See the idea
Write

Today is the only page you can change.

Open diary3 and write the day you are actually in. Add a sentence, a note, a photo, or nothing at all.

Screenshot of diary3's Today page: heading 'Sunday' with a paragraph and bulleted notes.
Remember

Yesterday becomes read-only.

Past entries stay intact. You can read them, search them, and trust that you are not editing the memory after the fact.

Screenshot of diary3's History page: a search box above a chronological list of past entries.
Reflect

Export context when you want a second brain.

Create a short-lived markdown link and paste it into ChatGPT, Claude, or Gemini. The link expires when you say.

Screenshot of diary3's Share section: a time-limited URL with Copy and Revoke buttons.
Own

Your timezone, your export, your exit.

Set the day boundary that matches your life. Export everything whenever you want. Delete the account when you are done.

Screenshot of diary3's settings: Theme picker, Time zone selector, and Storage tier.
How it works

A small daily ritual. A record you cannot keep improving.

  1. 01
    Open today.
    One page appears for the current date.
  2. 02
    Write honestly.
    Edit freely while the day is still happening.
  3. 03
    Come back later.
    Past days are preserved as a record, not a draft.
The diary3 mascot — a hedgehog curled up in a wicker basket.
Pricing

Simple pricing

Start with text for free. Upgrade only if your diary gets media-heavy.

Free

Everything you need to start.

$0 forever
  • Unlimited text entries
  • 250 MB of storage
  • 10 MB per file
Start writing →
Paid

For the long, photo-heavy diary.

$29 per year
  • Everything in Free, plus:
  • 10 GB of storage (40× more)
  • 50 MB per file
Upgrade — $29 / year
Questions

The practical bits.

Why can't I edit yesterday?

Because it already happened. Today is the only page you can change.

What if I miss a day?

The day stays blank. You don't get to rewrite it later — the gap is part of the record.

Can I export my entries?

Yes. Anytime, from Yours. Short-lived markdown links you can paste into ChatGPT, Claude, or Gemini too.

Does it work on my phone?

In the browser, yes. No native app.

Can I cancel?

Yes, anytime, from the You page after signing in. You keep paid features until your year is up — no proration, no surprises.