Does ゆうちょ通帳アプリ work on iPhone Duo?
Not yet. ゆうちょ通帳アプリ's current version (24.0.0, 15 September 2026) came out before Apple's iPhone Duo tools, so on the inner screen it opens in an iPhone-size window with black bars. It works, just not full screen.
- On iPhone Duo
- Not yet
- Developer
- Japan Post Bank Co., Ltd.
- Category
- Finance
- Current version
- 24.0.0 · 15 September 2026
- Popularity
- #19 in the top charts in Japan
- App Store rating
- 4.5 out of 5 (219,221 ratings)
- Last checked
How we know
Its current version is older than Apple's iPhone Duo tools (5 October 2026): on the inner screen it opens in an iPhone-size window with black bars. See it on the App Store
History on iPhone Duo
- · Not yet (version 24.0.0)
Other Finance apps on iPhone Duo
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iAEON-イオンペイも使える！「アイイオン」イオンスマートテクノロジー株式会社 · FinanceUpdated, unconfirmedUpdated 6 October 2026 -
ＭＤＣアプリ三菱UFJニコス株式会社 · FinanceNot yetLast update 13 September 2026 -
d払い－スマホ決済アプリ、キャッシュレスでお支払い株式会社NTTドコモ · FinanceUpdated, unconfirmedUpdated 20 October 2026 -
楽天ペイRakuten Group, Inc. · FinanceNot yetLast update 28 September 2026 -
PayPayPayPay Corporation · FinanceUpdated, unconfirmedUpdated 28 October 2026 -
Paidy (あと払いペイディ)-後払いアプリPaidy Inc. · FinanceUpdated, unconfirmedUpdated 28 October 2026 -
ゆうちょ手続きアプリJapan Post Bank Co., Ltd. · FinanceNot yetLast update 30 September 2026 -
SuicaEast Japan Railway Company · FinanceUpdated, unconfirmedUpdated 20 October 2026
All apps on iPhone Duo in Japan →
Got an iPhone Duo? How does ゆうちょ通帳アプリ look on the inner screen?
No owner report yet for version 24.0.0.
Still looking for the iPhone Duo itself? Restocks sell out within minutes: get an alert the moment one lands near you.
Good to know
Does ゆうちょ通帳アプリ work on iPhone Duo?
Not yet. ゆうちょ通帳アプリ's current version (24.0.0, 15 September 2026) came out before Apple's iPhone Duo tools, so on the inner screen it opens in an iPhone-size window with black bars. It works, just not full screen.
Why do some apps have black bars on iPhone Duo?
Because they were built before Apple's iPhone Duo tools. On the inner screen, an app built for an older iOS opens in an iPhone-size window on a black background; one built for iOS 27.0 uses more of it but leaves some space blank; only apps built with the iOS 27.1 SDK, which developers have had since 5 October 2026, use the whole display.
When will ゆうちょ通帳アプリ be adapted to iPhone Duo?
Only Japan Post Bank Co., Ltd. knows. We check ゆうちょ通帳アプリ on the App Store again within about 1 h: this page changes as soon as a new version says it supports iPhone Duo.
Do apps that aren't adapted still work on iPhone Duo?
Yes. Every iPhone app runs on iPhone Duo: one that isn't adapted just doesn't fill the inner screen until its developer updates it.
How we measure
Sources: Apple's list of apps adapted to iPhone Duo (22 October 2026) and each app's App Store record (version, release date, release notes, description). Apple doesn't say which tools an app was built with, so an app stays “Updated, unconfirmed” until its developer says more.