A health diary with facing weeks and large entry keys on the Duo
Does Heart One: Health Log with Dog work on iPhone Duo?
Yes, seen in the developer's screenshots: a compact daily log on the cover and two weeks side by side on the open display.
- Simulator verifiedHaruhiko Kishi, the developer, on the product page for the app, which shows unframed screenshots of it on the iPhone Duo's cover and open display. The App Store release notes for version 1.3.7 (released October 16, 2026) add that half-open on a desk, the value you are entering sits on top and the number keys below. The screenshots don't say which app version they show.
Adapted for the fold
- Closed · Outer display
Today's log on the cover
Closed, the daily log and shortcuts are stacked beside the side controls.
- Open · Inner display
Two weeks across the display
Open, a week sits on each side, separated at the middle.
- Book · Partly folded
Number keys below
Half-open on a desk, the value you are entering sits on top and the number keys below.
About Heart One: Health Log with Dog
Heart One records your daily health values and shows them as a diary. In the developer’s screenshots, the cover shows a compact daily log, the open display shows two weeks side by side, and an upright entry view has large number keys. Half-open on a desk, the release notes say, the value you are entering sits on top and the number keys below.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Simulator screenshots reviewed
Simulator verified · iphone-duo
Looked at the developer's three Duo screenshots: a compact daily log on the cover, a two-week spread across the open display, and an upright entry view with large number keys. The Duo's status controls are visible, and the cover image is 1398 by 2034 pixels.
Poses shown: Closed, Open. These are observations of the evidence, not a test of every interaction.
App version: Not recorded in this evidence.
Stills from the developer's page only: the app version, Xcode version and capture setup aren't given. No build was run, so folding between layouts and typing aren't shown. Nothing shows the half-folded or standing pose. No health feature or claim was assessed.
View reviewed evidence ↗
On the ideas wall
All ideas
Heart One: today's log opens into a two-week diary
Haruhiko Kishi's health diary keeps today's log on the cover. Open the phone and it becomes a two-week diary, one week on each page. The developer's screenshots show both.
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.
The best iPhone Duo apps so far (October 2026)
The apps worth installing on day one, from Apple's four 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/heart-one/"><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.
Sources: Heart One: Health Log with Dog on the App Store (apps.apple.com) · Heart One: Health Log with Dog in Apple's app lookup (itunes.apple.com) · Heart One's product page (musicflow.tokyo)
More for iPhone Duo
Meditation Timer - Zenitizer
Manuel Kehl
A meditation timer that starts when you stand the Duo up like a tent, like an hourglass
Simulator verified: Manuel Kehl, the developer, in a submission to FoldHunt on October 21, 2026, with unframed captures from the iPhone Duo simulator in the press release (impresskit.net) and a walkthrough on YouTube. The release notes for version 1.18 (released October 20, 2026) bring full iPhone Duo support, with layouts for the inner and outer displays, the fold and landscape, and a meditation that starts when you stand the phone up like a tent.
- Standing
- Open
- Book
- Closed
Sleep Log AI : Coach & Tracker
GymStreak Ltd
A sleep sound recorder: a bedside clock when folded, your night report on two pages open
Simulator verified: GymStreak Labs, the developer, in a submission to FoldHunt on October 22, 2026, saying version 1.6 is live on the App Store. The SleepLog website has an iPhone Duo section with unframed screenshots of the cover, the open display and the half-open layout. The App Store seller is GymStreak Ltd; the release notes for version 1.6 (released October 21, 2026) are about the new free tier and don't mention the Duo.
- Closed
- Book
- Open
White Noise Sounds - Nap Noise
Hugo Pinon
An ambient scene and its sound mixer closed, the scene filling the open screen beside them
Simulator verified: Hugo Pinon, the developer, in a submission to FoldHunt on October 10, 2026, saying it is ready for launch day, and in a YouTube video of the app on iOS 27.1 in the iPhone Duo simulator from Xcode 27.1 RC, closed and open (youtube.com). The App Store seller is Hugo Pinon (id 6737862796). The release notes for version 2026.10.23 (released October 10, 2026) say it is fully optimized for iPhone Duo, with a split-display audio mixer, quick playback controls on the cover screen and side-by-side multitasking.
- Closed
- Open