The iPhone Duo is the first iPhone that opens into something close to a small notebook. That changes what a good journaling app looks like. A diary app made for a narrow phone screen can look stretched once you unfold it. One that knows about the fold can feel a lot like a paper journal.
I've been keeping a daily journal on the Duo since it came out. Here are the apps worth a look, and the things that matter most on a foldable.
What to look for in a journal app on the iPhone Duo
- It uses the inner screen. Two columns or a two-page layout, not one phone column with wide empty margins.
- It works folded, too. Quick notes happen on the outer screen. The app should move between the two without losing your place.
- More than one way to write. Some days you want to type, some days talk, some days write by hand.
- Easy to look back. A calendar or photo view makes old entries worth opening again.
- Private. A journal should have a lock.
1. WOYM: voice, handwriting and a real two-column layout
WOYM (short for "What's On Your Mind") is a voice-first journal for self-improvement and mental health. Of the apps here, it's the one that feels most made for the Duo.
Unfold the phone and the Today screen splits into two columns: habits on one side, todos on the other. Nothing gets lost in the fold.
Turn the Duo sideways and the welcome screens open like a book: something to read on the left page, choices on the right, and nothing to tap near the fold.
The part I use most is Write by Hand. It opens a lined page where you write with your finger on iPhone, or Apple Pencil on iPad. You get a pen, a fine liner, a highlighter, an eraser and any colour you like. The page stays as your handwriting, not converted to typed text, but the words are still searchable later.
Other things worth knowing:
- Voice journaling. Talk and it types as you speak. "Polish Writing" then cleans up the grammar and filler words.
- One-tap mood check-in that keeps your streak going, plus habits and todos next to your entries.
- Look back with a calendar, a photo grid or a map of where you wrote.
- Paper journals in, too. Take a photo of a handwritten page and it becomes text.
- App Lock with Face ID.
Best for: people who want to journal by voice or by hand, and want a journal app that actually uses the whole Duo screen.
2. Day One
Day One has been the go-to journal app for years. It has templates, several journals in one place, tags, a map of your entries, rich photo support and encrypted sync across iPhone, iPad and Mac.
Best for: long-time journalers who also write on a Mac and want years of entries in one place.
3. Apple Journal
Apple's own Journal app is the simplest way to start. Its Journaling Suggestions pull in moments from your photos, workouts and places, so you're never staring at a blank page. Entries can be locked with Face ID.
Best for: beginners. If you outgrow it later, some apps can import your Apple Journal entries so you don't start from zero.
4. Journey
Journey runs on iPhone, Android, the web and Windows, so it suits people who move between devices. It has mood tracking and guided journaling programs.
Best for: anyone who switches between an iPhone and an Android or Windows device.
5. GoodNotes (for a paper-planner feel)
GoodNotes isn't a journal app, but a lot of people use it for handwritten journaling with planner and bullet journal templates.
Best for: people who want a digital planner more than a diary.
Quick picks
| If you want... | Try |
|---|---|
| The best use of the Duo's big screen, plus voice and handwriting | WOYM |
| A long-term journal across iPhone, iPad and Mac | Day One |
| The simplest start | Apple Journal |
| iPhone plus Android or Windows | Journey |
| A digital planner look | GoodNotes |
Tips for journaling on a foldable iPhone
- Folded for quick check-ins, open for longer entries. Log your mood on the outer screen in a few seconds; open the phone at night to write properly.
- Try voice journaling on a walk. It's the easiest way to clear your head when typing feels like work.
- Write by hand before bed. Slower writing means slower thinking, and that's the point.
- Use prompts when you're stuck. A list of journal prompts helps on the days nothing comes.
- Start small. Three lines a day beats one long entry a month. If you're new, this guide on how to start a journal is a good place to begin, and a gratitude journal is an easy first habit.
Final thoughts
The best journal app is the one you open every day. On the iPhone Duo, that's usually the one that makes the unfolded screen feel like a page and not a stretched phone. Try two or three from this list, write for a week, and keep the one that sticks.
Which journaling app are you using on your Duo? Let me know in the comments.
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