A red light session that starts when you unfold and a timer that rolls into the crease
Does Red Light For Your Eyes work on iPhone Duo?
Yes. Red Light For Your Eyes has a layout made for iPhone Duo, and FoldHunt's editor has checked it in the simulator.
- Simulator verifiedThe developer, Bulltech, in a video on X of the Duo version on the simulator, posted on October 11, 2026 (@bullte_ch on X): "Will be ready on iPhone Duo, with special interaction designed for Duo only". The App Store seller is BULLTECH (id 6449202094). The current version, 4.0.1 (released October 22, 2026), does not mention the Duo in its release notes or description, so it isn't out yet.
Adapted for the fold
- Closed · Outer display
Unfold to start
Closed, the cover shows the session length and an "Unfold to Start" button; the red light only shines on the inner display.
- Book · Partly folded
The timer rolls into the crease
Half-folded, both halves glow red and the countdown glides from half to half and rolls into the crease as you fold, a timer style the app calls Fold Valley.
- Open · Inner display
The whole screen glows
Open flat, the red light fills the inner display with the countdown on it.
About Red Light For Your Eyes
Red Light For Your Eyes fills the screen with deep red light for a timed session of a few minutes, which its makers base on a 2021 study of red light and ageing eyes. Bulltech showed the coming Duo version on the simulator: the cover asks you to unfold to start, the red light shines only on the inner display, and with a timer style made for the Duo the countdown glides between the halves and rolls into the crease as you fold. The setting for that timer style also says you can tap a half to toss the light across the fold, or fling it over the crease. It isn’t in the release notes yet.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· Simulator recording reviewed
Simulator verified · iphone-duo
Watched the developer's 61-second recording of the iPhone Duo simulator, with its status ring, a mouse pointer and the simulator's toolbar: on the cover, the session length and an Unfold to Start button, then the settings with the Timer Movement set to Fold Valley; unfolded, the red light fills the inner display with a countdown that moves between the halves, also while the phone bends partway.
Poses shown: Closed, Open. These are observations of the evidence, not a test of every interaction.
App version: Not recorded in this evidence. Environment: iPhone Duo simulator.
No app or Xcode version is shown. The phone bends only partway in the recording, so a full half-fold isn't shown. No build was tested.
View reviewed evidence ↗
On the ideas wall
All ideasRed Light For Your Eyes Will be ready on iPhone Duo With special interaction designed for Duo only apps.apple.com/app/id64492020…
BULLTECH ᯅ@bullte_chBackground task on optimizing MakeNessAI for iPhone Duo (that will be release 23 oct)
It looks like OpenAI solved the Navier-Stokes Millennium Prize problem!
Let's try a test to learn more about the problem (response pre generated from TestFlight version here).
Result : some
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 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?
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Sources: Bulltech on X (x.com)
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