Language flashcards, the card above the fold and the review buttons below it
Does Flexi: Vocabulary Flashcards work on iPhone Duo?
Yes. Flexi: Vocabulary Flashcards's App Store page says it supports iPhone Duo, so the update is out. FoldHunt's editor hasn't seen it running yet.
- App Store confirmedThe developer, Tomer Beilinson, in a post on X on October 10, 2026, with a picture of Flexi on iPhone Duo half-folded and closed (@tomerbeil on X). The release notes for version 3.9.0 (released October 9, 2026) list iPhone Duo support, with layouts for both displays and, when you review with the phone seated, the card above the fold and the controls below.
Adapted for the fold
- Book · Partly folded
The card up top, the buttons below
Half-folded on a table, the card with its word, example sentence and picture sits on the top half, and the audio buttons and Again or Know sit on the bottom half.
- Closed · Outer display
Swipe through cards on the cover
Closed, a review card fills the cover, with close, progress and other buttons in a column down the right side.
About Flexi: Vocabulary Flashcards
Flexi turns a word or a short phrase in the language you’re learning into flashcards, with an example sentence, a definition, a picture and audio, and then quizzes you on them. Version 3.9.0 adds iPhone Duo support. In the developer’s picture, the half-folded phone sits on a table with the card on the top half and the audio and review buttons on the bottom half, and the closed cover shows a card being swiped away. The release notes say you can also make cards and browse decks on either display.
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 3.10.0 (released October 21, 2026) mention iPhone Duo: "iPhone Duo improvements Refined layouts for a smoother experience on iPhone Duo."
App version: 3.10.0.
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 ↗
On the ideas wall
All ideas
Flexi is ready for iPhone Duo! I’ve adapted my language-learning flashcard app for both displays. In Seated mode, the card stays up top, with audio and review controls below — ready to study on a table.
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/flexi/"><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: Tomer Beilinson on X (x.com) · Flexi: Vocabulary Flashcards on the App Store (apps.apple.com)
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