A dated record of additions and source checks. App previews, shipping updates and future hands-on results are different things, and stay labelled as such.
Tool change
A studio replaces a calculator.
The screen-fit calculator has been retired. In its place, a 3D mockup studio renders the supplied device model in the browser: drop in a screenshot, set the fold angle, then export a still or a short video. Its two display panels carry the proportions of Apple’s published pixel counts, so an image arrives at the shape Apple published rather than at the shape of a mesh.
No arithmetic was lost. The same worked example, with the same figures, sits in the black-bars guide, and the calculator’s old address now points at the studio. Three.js and the 0.90 MB model are requested by that one page and by nothing else on the site.
Source check
What developers have actually said.
Checked the App Store record and the public channels of every app in the table. None of their release notes mentions iPhone Duo, Split View or a foldable display. Thirty-two of them shipped an update after Apple’s 9 September announcement and still said nothing; the other five last shipped before it, so their silence carries no information. The app support table records every result with the version, the date and what was searched.
One developer has commented publicly and one game has been described only by a trade publication. Those two rows carry their quote and their link; the rest record silence, which four weeks before a device ships is the expected result rather than a verdict.
The screen-fit calculator now carries both displays as presets, derived from Apple’s published pixel counts. Apple states that the two displays share an aspect ratio and publishes no figure; those pixel counts give 1.4217 for the inner display and 1.4549 for the outer, and the calculator page shows the working rather than picking one. The black-bars guide was rewritten around the same arithmetic.
A correction to our own earlier framing: the compatibility guide now quotes Apple’s passage on older apps in full. Apple does not use the word letterboxed anywhere in its iPhone Duo material, and the one place it writes letterboxing is advice to game developers about their own rendering.
The homepage, app profiles and guides have a new editorial design. A manually controlled scene switch and a display-first planning tool add useful interactions without hiding the article text.
Initial edition
Seven profiles. One standard.
The first edition includes four third-party apps showcased in Apple’s announcement: Netflix, Zoom, Slack and Detail. Three Apple apps, Safari, FaceTime and Camera, illustrate system workflows.
Profiles describe the demonstrated task, its source and what still needs checking. No entry in this edition represents our own retail-device test.
Six guides cover compatibility, multitasking, app pairs, black bars, app testing and adaptive layouts. The screen-fit calculator supplies a reproducible geometry example rather than an assumed display specification.
A developer release note, an official demonstration or a reproducible report tied to a specific app version can justify a change. A renamed screenshot or an unverified social claim cannot. A correction records what changed; it does not silently rewrite what was published before.
Dates reflect actual editorial changes. This log is not automatically refreshed to make older entries look new.