iPhone Duo goes on sale Oct 23, 2026. Developers are likely to update their apps then, so statuses are for reference until launch.

Release day, your time1 day 01:32:45

All apps

Heart One

Haruhiko KishiUtilities

View in the App Store
On iPhone Duo

Fits

Heart One fills the inner screen and adapts when you fold.

Made for iPhone Duo, the developer says: open it like a notebook to see two weeks of records, or half open for a keypad below.[1]

How we know
Claimed by the developer
Status updated

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Sources

  1. MusicFlow: Heart One