Penjo: a journal and planner for iPhone Duo

A page for every day, with that day’s Calendar events and Reminders beside it. Penjo works on iPhone Duo in every pose, and with iOS 27.2 you can write in it with Apple Pencil.

Download Penjo on the App Store

Free to try. Calendar, Reminders, iCloud sync and exporting are part of Penjo Unlimited.

Featured by Apple: in “Great Apps on iPhone Duo” in 37 countries at the Duo launch, and in “Make the Most of Apple Pencil” in over 160 countries.

Apple Pencil

Write with Apple Pencil

Once Apple Pencil has touched a page, every day opens ready to write, with the Apple Pencil tools along the bottom of the page: pens, a highlighter, an eraser and more, the same tools as on iPad. You can add your own pens and colors to them. If you also draw with your finger, turn off Ready for Apple Pencil in the page’s … menu to get the Drawing button back.

Write on the inner display in any pose, or on the outer display with the Duo closed. Handwriting search finds what you wrote, in every journal.

Apple Pencil on iPhone Duo works with Apple Pencil (USB‑C) on iOS 27.2 or later.

Held tall, the whole page fits the display.

Open in landscape, the day’s events and reminders stay beside the page.

Fold it shut

Fold it shut from the book pose, or from open flat in landscape, and the journal closes. Any other fold keeps your page.

Open

Unfold it for the iPad layouts

Unfolded, the inner display gets the layouts Penjo has on iPad: the week with each day’s page and plans, the whole year at a glance, and the day panel beside the page.

The day panel holds that day’s Calendar events and Reminders, where you can check off a reminder or add a new event.

The open iPhone Duo in landscape: a planner page with a handwritten schedule and the day’s events and reminders in a side panel

The week view on the open iPhone Duo, with seven diary pages and their events — Week

Every pose

iPhone Duo closed: a handwritten diary page on the outer display — **Closed** The outer display keeps Penjo’s iPhone tools, with the navigation in the side bar.

iPhone Duo half open: the day’s events and reminders in the upright half, a planner page in the flat half — **Half open** Set it down like a small laptop: your plans stand up in the upper half, and the page lies flat below to write on.

iPhone Duo held like a book: a planner page with a handwritten schedule on the left, the day’s events and reminders on the right — **Book** Hold it open like a book: your page on the left, the day’s events and reminders on the right.

iPhone Duo closed and turned sideways: a diary page with the navigation in the side bar — **Standing** Closed and turned on its side, Penjo keeps its landscape layout, with the navigation in the side bar.

Videos

They have no sound.

Portrait

Landscape

Questions about Penjo on iPhone Duo

Does Apple Pencil work in Penjo on iPhone Duo?

Yes. With iOS 27.2 or later, Apple Pencil (USB‑C) writes in Penjo on the inner and the outer display. Penjo’s pages are the same Apple Pencil canvas as on iPad.

Is Penjo free on iPhone Duo?

You can start free. The free plan includes 3 journals with 14 daily entries each, handwriting search and photos. Calendar events, Reminders, iCloud sync and exporting are part of Penjo Unlimited.

Do my journals sync with my iPad and Mac?

Yes, with Penjo Unlimited. iCloud keeps every journal on your iPhone Duo, iPad, iPhone, Mac and Apple Vision Pro, and one Unlimited purchase covers all of them.

Try Penjo Free

The screenshots and videos come from Penjo in the iPhone Duo simulator, with sample journals made for them. Updated October 29, 2026.