Counts the days you and your family have lived, now ready for the Duo
Does Erdentage work on iPhone Duo?
Yes. Erdentage'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, Thomas Kahle, in the German release notes for version 1.4.1 (released October 10, 2026): "1.4.1 macht Erdentage bereit für das iPhone Duo und iOS 27" (makes Erdentage ready for iPhone Duo and iOS 27); and on Mastodon on October 11, 2026, saying the release fixes the display, especially on the iPhone Duo, and asking anyone who gets one how the app works on it (mathe.social). There are no pictures of it on the Duo yet. The App Store seller is Thomas Kahle (id 6770075035).
Adapted for the fold
We're waiting on details of exactly what Erdentage changes for the fold. Are you the developer? Tell us.
About Erdentage
Erdentage counts how many days you have been alive, from your birth date and optionally the time, and points out milestone days such as primes and palindromes for the whole family. Version 1.4.1 makes it ready for iPhone Duo, the developer says. There are no pictures of it on the Duo yet.
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 1.4.1 (released October 10, 2026) mention iPhone Duo: "1.4.1 macht Erdentage bereit für das iPhone Duo und iOS 27."
App version: 1.4.1.
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
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/erdentage/"><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: Erdentage on the App Store (apps.apple.com) · Thomas Kahle on Mastodon (mathe.social)
More for iPhone Duo
JoyJar
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A shared gratitude jar: open the Duo and the jar faces a joy from it, like a book
Simulator verified: ReAlign Leadership LLC, the developer, in a submission to FoldHunt on October 21, 2026, with a plain screen recording of the app on the iPhone Duo simulator (iOS 27.1) on YouTube and a page about the Duo layouts (joyjar.app). JoyJar is coming soon to the App Store and Google Play.
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Penjo: Pencil Journal, Planner
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A handwritten journal: today's page on one side of the fold, today's plans on the other
Simulator verified: Zafer ARICAN, the developer, in a submission to FoldHunt on October 20, 2026, with simulator screenshots and recordings on the Penjo site (penjoapp.com). The release notes for version 3.8 (released October 20, 2026) say Penjo is now optimized for iPhone Duo in every pose: open, the page uses Penjo's iPad layouts; in the book and seated poses it stays clear of the fold; fold it shut and the journal closes.
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Megu: SI Closet & Planner
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A digital closet and AI stylist, with the piece you tap beside the grid when open
Simulator verified: Jake Antebi, the founder of Megu, in an email to FoldHunt on October 22, 2026, saying Duo support is live with a layout designed for the unfolded screen, and in a post on the Megu blog on October 19, 2026 saying the Duo layouts arrived in version 1.6. The press kit holds unframed captures of the app on the Duo's cover and open display, at the simulator's screen sizes. The App Store seller is JA Technology Consulting LLC. The release notes for version 1.8 (released October 22, 2026) say: "Improvements for iPhone Duo."
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