Private journal app: the privacy checklist before you write a word

A good private journal app answers four questions plainly before you write anything: who can read your entries, where they're stored, how the most sensitive notes are protected, and how you take everything with you or delete it for good. If an app is vague on any of those, it isn't private, however nice it looks. It suits anyone who wants to write honestly, and especially people setting up on their own for the first time, with a new flat, a new job and a lot going on that you'd rather not leave lying around in a notebook on the kitchen table.

Privacy is the whole point of a journal. You write differently when you think someone might read it, and a journal you self-censor is just a diary of appointments.

What to look for in a private journal app

Ignore the themes and the fonts for now. These are the checks that decide whether your entries are really yours.

1. Who can read it. The honest answer should be "you, and nobody else unless you choose". Check whether staff can access entries, whether any AI features read them, and whether anything you write is used for ads or to train AI models.
2. Where it's hosted. Your entries live somewhere: on your phone, on a company's servers or both. The app should say which country your account is hosted in and name any outside companies that process your writing.
3. Encryption for sensitive notes. Some entries matter more than others. Look for a way to lock the most personal ones with something only you know, so they're encrypted rather than just hidden behind the app's front door.
4. A lock on the app itself. Your phone gets handed to people, left unlocked on a table, borrowed to show a photo. The journal should stay closed when that happens.
5. Export. You should be able to take everything out in one go, in a form you can read without the app. A journal you can't export is a journal you'll lose one day.
6. Delete that really deletes. Look for a way to delete individual entries and your whole account, and a clear statement of what happens to your data afterwards.
7. What happens if you stop paying. If it's a subscription, find out whether you can still see and export your entries after it ends.
8. No surprise sharing. Any social features should be off by default, and you should choose what's shared, person by person.

If you can't find answers to the first three in a couple of minutes, take that as an answer in itself.

Notebook or app: the honest trade-off

A paper notebook is private in one sense: there's no server. But it can be read by anyone who finds it, it can't be locked, and it can't be backed up. Lose it in a move and it's gone.

An app can be locked, searched and backed up, and it's on the phone that's already in your pocket. The trade is that you're trusting a company with where your words live. That's why the checklist above matters more for a journal than for almost any other app you use.

Some people split the difference: everyday entries in an app, and anything truly raw written on paper and kept somewhere safe. There's no wrong answer, as long as it's a choice you made on purpose.

How to set one up in 20 minutes

This works with any journal app, or even a locked notes app.

1. Read the privacy page first (5 minutes). Find the answers to who can read it, where it's hosted, and how export and delete work. Write them down in your first entry, so you remember what you agreed to.
2. Turn on the app lock (1 minute). Use your phone's face or fingerprint check if the app offers it, or a code that isn't your phone's code.
3. Set up the extra lock for sensitive notes (3 minutes). Choose something you'll remember and nobody who knows you could guess. Avoid your birthday, your pet's name or anything on your social media.
4. Do a test export (3 minutes). Write one short entry, export it, and open the file. If you can't read it, find out now, not in five years.
5. Check your phone's notifications (2 minutes). Make sure journal reminders don't show a preview of your writing on the lock screen.
6. Choose a time and a cue (2 minutes). After you brush your teeth, on the bus home, with the first coffee. Attach the habit to something you already do.
7. Write your first entry (4 minutes). Not your life story. Where you live now, what this week has been like, one thing you want to remember about it.

If you want help with what to put in the entries themselves, our guide on how to start a journal covers formats and habits, and what to write in a journal has prompts for the days you're stuck.

How mylife/ keeps a journal private

In mylife/ a memory can be a written moment, a photo, a video or a voice note, and Slash, your mate in the app, titles and tags each one and finds any memory later when you ask in plain English. Slash only ever sees your own things.

On the four questions: nothing you keep in mylife/ is sold or used for ads. Before Slash starts, the app shows exactly which AI companies are involved and what each one receives. Your account is hosted in the EU, in Paris; Slash runs on Anthropic's AI and OpenAI turns speech into words, both in the US, and under their commercial terms neither uses your data to train its models. A vault, locked with your own answers, encrypts sensitive notes on your phone. You can export everything or delete your account whenever you like, and if a subscription ends, everything you kept stays yours to see, export or delete. There's more detail on privacy in mylife/, or you can try mylife/ free for 3 days.

Common mistakes that leave a journal exposed

• Skipping the privacy page. Most people never read it. For a journal, it's the most important page in the app.
• Using an obvious lock. A code anyone in your household could guess protects nothing from the people most likely to look.
• Lock screen previews. A reminder that shows the first line of yesterday's entry has just published it to whoever's near your phone.
• Never testing export. You only find out it doesn't work when you need it, which is usually when you're switching phones or apps in a hurry.
• Leaving it logged in on a shared device. A tablet on the sofa or a shared laptop in a flatshare is not a private place.
• Putting everything in the sensitive lock. If every entry needs the extra lock, you'll stop writing. Save it for what genuinely needs it.
• Mixing it with shared notes. Keep the journal away from anything you share, such as a flat's shopping list or a group plan.

If you also want somewhere secure for notes that aren't journal entries, such as account details or a household's private information, see our guide to choosing an encrypted notes app.

Frequently asked questions

What is the most private way to keep a journal?

The most private journal is one that only you can open, that encrypts the most sensitive entries, and whose provider is clear about who can access it and where it's stored. Paper is private from servers but not from people, while an app can be locked and backed up. Choose the one whose risks you're most comfortable with.

Can journal apps read your entries?

Some can, depending on how they're built and what features they offer. Check the privacy page for whether staff or AI features can access entries, whether anything is used for ads or to train AI models, and which outside companies process your writing. If it doesn't say, ask before you write anything personal.

What happens to my journal if I delete the app?

Deleting the app from your phone doesn't always delete your account or your entries on the provider's servers. Export what you want to keep first, then use the app's delete account option, and check what the privacy page says happens to your data afterwards.

Is a locked notes app good enough for a journal?

It can be, if the lock is strong and the notes are backed up somewhere you trust. You'll miss out on things journals are good at, like finding entries by date or searching old moments, but for a few private thoughts a week it does the job.

How do I keep my journal private from people I live with?

Use an app lock that isn't your phone's code, turn off lock screen previews for journal reminders, and don't stay logged in on shared devices. For anything especially personal, use an extra lock or encryption that only you know the answer to.