A handwritten journal: today's page on one side of the fold, today's plans on the other
Does Penjo: Pencil Journal, Planner work on iPhone Duo?
Yes, since version 3.8 on October 20, 2026, and seen in the simulator: in the book pose the day's page faces its events and reminders, and folding it shut closes the journal.
- Simulator verifiedZafer ARICAN, the developer, in a submission to FoldHunt on October 20, 2026, with simulator screenshots and recordings on the Penjo site (penjoapp.com). The release notes for version 3.8 (released October 20, 2026) say Penjo is now optimized for iPhone Duo in every pose: open, the page uses Penjo's iPad layouts; in the book and seated poses it stays clear of the fold; fold it shut and the journal closes.
Adapted for the fold
- Book · Partly folded
Your page beside your plans
Held open like a book, the day splits at the fold: your handwritten page on the left, and that day's Calendar events and Reminders on the right, where you can tick off a reminder or add an event. The week view puts two days on each side of the fold, and the month and year views leave a gap so no day is cut in half. Set down half open like a laptop, the plans stand up on the upper half and you write on the page lying flat below.
- Open · Inner display
Penjo's iPad layouts
Unfolded, you get the layouts Penjo has on iPad: the day panel beside the page, the week with each day's page and plans, the whole year at a glance, and search across every journal, which reads handwriting. Held tall, the whole page fits with the tools in the side bar.
- Closed · Outer display
Fold it shut, the journal closes
Closed, the cover keeps Penjo's iPhone tools, with the navigation in the side bar. Fold the Duo shut from the book pose and the page is saved, the journal's cover fills the outer display, then shrinks onto its card in your journal list.
- Standing · Hands-free
Sideways on the cover
Turned sideways and stood up, the cover keeps Penjo's landscape layout, with the navigation in the side bar.
About Penjo: Pencil Journal, Planner
Penjo is a journal and planner you write by hand. In the morning, today’s page shows your Apple Calendar events and reminders and you plan around them with Apple Pencil or a finger; by evening the same page is your diary, with notes, sketches and photos. Search finds the words you wrote, even in your handwriting, and iCloud keeps it on iPad, iPhone and Mac. It’s free to start with three journals; Penjo Unlimited adds Calendar and Reminders, iCloud sync and unlimited journals.
Version 3.8, out on October 20, 2026, brings Penjo to the iPhone Duo in every pose. Open it like a book and the day’s page faces its plans; set it half open on a table and you write on the flat half while the plans stand up; unfold it and you get the iPad layouts. Fold it shut from the book pose and the journal closes with it, page saved. Zafer ARICAN says Penjo’s Duo pages use the same PencilKit canvas as on iPad, so Apple Pencil will work there as soon as Apple brings it to the Duo.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Simulator recording reviewed
Simulator verified · iphone-duo
Watched the site's 8-second clip from the iPhone Duo simulator, with its status ring: a planner page open beside the day's events and reminders, folded into the book pose, then closed, the Planner cover filling the outer display and shrinking onto its card. Also checked the site's screenshots of the book, half-open, open, held-tall and closed layouts in the simulator's device frame.
Poses shown: Book, Open, Closed. These are observations of the evidence, not a test of every interaction.
App version: 3.8. Environment: iPhone Duo simulator.
No Xcode version is given. The site's App Store preview videos weren't watched in full, and Apple Pencil can't be tried in the simulator. No build was tested.
View reviewed evidence ↗
Related guides
iPhone Duo poses: closed, open, book, standing and Split View
A plain-language guide to the ways you will hold iPhone Duo, what the phone itself does in each, and the apps and ideas that make the most of them. For anyone buying one, and for anyone building for it.
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Is this your app?
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Sources: Penjo on iPhone Duo, with simulator screenshots and videos (penjoapp.com) · Penjo: Pencil Journal, Planner on the App Store (apps.apple.com)
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