A planner that opens like an A6 diary: your week on the left, handwriting on the right
Does Spread Planner work on iPhone Duo?
Yes. Spread Planner's App Store page says it supports iPhone Duo, so the update is out. FoldHunt's editor hasn't seen it running yet.
- App Store confirmedThe developer, in the App Store description of version 1.0 (released October 8, 2026), its first release, which has no release notes: open, the week sits on the left page and handwritten notes on the right like an A6 planner; half open, the fold becomes the spine; closed, just today's page. There are no pictures of it on the Duo yet. The App Store seller is SANWA Inc. (id 6816799383).
Adapted for the fold
We're waiting on details of exactly what Spread Planner changes for the fold. Are you the developer? Tell us.
About Spread Planner
Spread Planner shows your week and your handwritten notes as a two-page spread. The developer points out that the Duo’s inner screen has nearly the proportions of A-series paper: open it and the week is on the left page and notes on the right, like an open A6 planner. Half open, the fold becomes the spine; closed, the cover shows just today’s page. There are no pictures of it on the Duo yet.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· App Store page reviewed
App Store confirmed · iphone-duo
The App Store description mentions iPhone Duo: "Opens like an A6 planner The inner display of iPhone Duo has almost the same proportions as A-series paper." (version 1.0, released October 8, 2026).
App version: 1.0.
Store text only: we haven't seen the app running, and the store page doesn't show how each pose is used.
View reviewed evidence ↗
Related guides

The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.

Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
Is this your app?
Add the badge to your site or press kit. It links back to this page, where fans can upvote you.
<a href="https://foldhunt.com/apps/spread-planner/"><img src="https://foldhunt.com/badges/featured-on-foldhunt.svg" alt="Featured on FoldHunt" width="220" height="54"></a>Need to update the listing? Email the editor.