Flash mental-math drills with numbers on top and the answer pad below the fold
Does FlashAnzan: Mental Math work on iPhone Duo?
Yes, the developer says so: FlashAnzan 1.3.0 is out with release notes saying it is optimized for iPhone Duo.
- App Store confirmedThe App Store release notes for version 1.3.0: "Now optimized for iPhone Duo. Set it half-open like a laptop: the numbers flash on the top screen while the bottom screen shows which problem you're on... When it's time to answer, the bottom screen turns into a number pad."
Adapted for the fold
- Book · Partly folded
Watch on top, answer below
Half-folded like a laptop, the numbers flash on the upper half while the lower half shows your progress, then turns into a number pad for the answer, according to the developer.
About FlashAnzan: Mental Math
FlashAnzan trains flash mental arithmetic: numbers appear one after another and you add them in your head. On a half-folded Duo the numbers flash on the top half and you type the answer on the bottom half.
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 release notes for version 1.3.8 (released October 21, 2026) mention iPhone Duo: "Works with iPhone Duo."
App version: 1.3.8.
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
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?
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/flashanzan/"><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.
More for iPhone Duo
RectoVerso: Flashcards
Simon Pinkas
Flashcards whose answer arrives as you open the phone: stop as soon as you know it
Simulator verified: Simon Pinkas, the developer, in a submission to FoldHunt on October 22, 2026, describing the closed, opening, half-folded, open and Split View layouts. The press kit has screenshots set in Apple's iPhone Duo artwork. RectoVerso came out on the App Store on October 23, 2026, at version 1.0.2: its description has an On iPhone Duo section, and the release notes mention opening iPhone Duo to reveal a figure's labels and Stats showing its chart beside the summary on the open, upright phone.
- Closed
- Book
- Open
- Split View
Facing Pages
DM Solutions and Development LLC
Bilingual stories that open like a book, the language you're learning beside your own
Simulator verified: DM Solutions and Development, the developer, in a submission to FoldHunt on October 15, 2026, saying it will be ready on launch day, with a recording of version 1.0 in the iPhone Duo simulator on YouTube. The app is on the App Store as Facing Pages: Learn Languages (version 1.0.2, first released October 19, 2026), and its description has a "MADE FOR IPHONE DUO" section.
- Closed
- Open
- Book
Fretalus
Individuation Labs LLC
Quick quizzes for the guitar fretboard and chords, with the question beside its answers
Simulator verified: Individuation Labs, the developer, in a submission to FoldHunt on October 27, 2026, and on the Fretalus website, with App Store screenshots from the iPhone Duo simulator. The App Store seller is Individuation Labs LLC. The release notes for version 1.4.2 (released October 24, 2026) say that on an unfolded iPhone Duo the question sits beside its answers.
- Open
- Closed